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Model: Efficient-Large-Model/Fast_dLLM_1.5B
Source: Original Platform

.gitattributes

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README.md

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+---
+license: apache-2.0
+language:
+- en
+base_model:
+- Qwen/Qwen2.5-1.5B-Instruct
+---
+
+# Fast-dLLM v2 (1.5B) — Efficient Block-Diffusion LLM
+
+## 📖 Introduction
+
+Autoregressive (AR) large language models (LLMs) have achieved remarkable performance across a wide range of natural language tasks, yet their **inherent sequential decoding limits inference efficiency**.
+
+We present **Fast-dLLM v2** — a carefully designed **block diffusion language model (dLLM)** that efficiently adapts a pretrained AR model (**Qwen2.5-1.5B-Instruct**) into a diffusion-style decoder for **parallel text generation**.
+
+Our approach introduces a novel decoding recipe incorporating a complementary attention mask and block diffusion mechanism, which together enable blockwise bidirectional context modeling while preserving the original AR training objectives and performance. To further enhance inference speed, we design a hierarchical caching mechanism: a block-level cache that stores historical context representations and a sub-block level cache that supports efficient parallel decoding within partially generated blocks.
+
+### ✨ Key Innovations
+- **Block Diffusion Mechanism + Complementary Attention Mask**  
+  Enables **blockwise bidirectional context modeling** without sacrificing AR objectives.
+- **Hierarchical Caching**  
+  - **Block-level cache**: Stores historical context representations across blocks.
+  - **Sub-block cache**: Parallel decoding within partially generated blocks.
+- **Token Shift Mechanism**  
+  Retains autoregressive characteristics while supporting bidirectional context within blocks.
+- **Parallel Decoding Pipeline**  
+  Achieves up to **2.5× speedup** over standard AR decoding **without compromising quality**.
+
+> 🚀 Fast-dLLM v2 uses **only ~1B tokens** for fine-tuning — a **500× reduction** vs. full-attention diffusion LLMs (Dream: 580B tokens) — while **matching or surpassing AR baselines** in accuracy.
+
+
+![Generation Process](assets/visualization_animation.gif)
+
+---
+
+## 🛠 Model Overview
+- **Type**: Block Diffusion Language Model (dLLM)
+- **Base Model**: `Qwen/Qwen2.5-1.5B-Instruct`
+- **Architecture**: Transformer w/ RoPE, SwiGLU, RMSNorm, Attention QKV bias, tied embeddings
+- **Params**: 1.54B (non-embedding: 1.31B)
+- **Layers**: 28
+- **Attention Heads**: 12 (Q), 2 (KV, GQA)
+- **Key Feature**: Parallel **block-wise decoding** + **hierarchical caching**
+
+---
+
+## 📦 Installation
+You will need `transformers`, `torch`, and our **custom generation function**:
+
+```bash
+pip install transformers torch numpy
+```
+
+---
+
+## 🚀 Quickstart
+
+```python
+from transformers import AutoModelForCausalLM, AutoTokenizer
+
+model_name = "Efficient-Large-Model/Fast_dLLM_1.5B"
+
+model = AutoModelForCausalLM.from_pretrained(
+    model_name,
+    torch_dtype="auto",
+    device_map="auto",
+    trust_remote_code=True
+)
+
+tokenizer = AutoTokenizer.from_pretrained(model_name, trust_remote_code=True)
+
+prompt = "Give me a short introduction to large language model."
+messages = [
+    {"role": "system", "content": "You are a helpful assistant."},
+    {"role": "user", "content": prompt}
+]
+
+text = tokenizer.apply_chat_template(
+    messages,
+    tokenize=False,
+    add_generation_prompt=True
+)
+inputs = tokenizer([text], return_tensors="pt").to(model.device)
+
+# Fast-dLLM v2 parallel decoding
+gen_ids = model.generate(
+    inputs["input_ids"],
+    tokenizer=tokenizer,
+    max_new_tokens=512,
+    small_block_size=8,
+    threshold=0.9,
+)
+
+response = tokenizer.decode(
+    gen_ids[0][inputs["input_ids"].shape[1]:], 
+    skip_special_tokens=True
+)
+print(response)
+```
+
+---
+
+## 📊 Performance & Benchmarks
+
+### ▶ Real-time Throughput
+Fast-dLLM v2 offers **up to 2.54× higher throughput** than Qwen2.5-7B-Instruct, **without loss in quality**.
+
+![Throughput Comparison](assets/throughput.png)
+
+---
+
+### 🏆 Benchmark Results
+We compare Fast-dLLM v2 against AR baselines and previous diffusion LLMs on diverse tasks:  
+HumanEval, MBPP (code), GSM8K, Math (reasoning), IFEval (instruction), MMLU, GPQA (knowledge QA).
+
+- **1B group**: Fast-dLLM v2 (1.5B) achieves **best average score: 45.0**.
+- **7B group**: Fast-dLLM v2 (7B) achieves **best average score: 60.3**, surpassing  LLaDA and Dream models.
+
+![Benchmark Results](assets/benchmark_results.png)
+
+---
+
+## 📜 Citation
+
+If you use Fast-dLLM v2 in your research or products, please cite:
+
+```bibtex
+@misc{wu2025fastdllmv2efficientblockdiffusion,
+      title={Fast-dLLM v2: Efficient Block-Diffusion LLM}, 
+      author={Chengyue Wu and Hao Zhang and Shuchen Xue and Shizhe Diao and Yonggan Fu and Zhijian Liu and Pavlo Molchanov and Ping Luo and Song Han and Enze Xie},
+      year={2025},
+      eprint={2509.26328},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL},
+      url={https://arxiv.org/abs/2509.26328}, 
+}
+```
+
+---
+
+## 📄 License
+Released under **Apache 2.0**, following the base Qwen2.5 license.
+
+---
+
+## 🔗 Resources
+- 📄 [Paper](https://arxiv.org/abs/2509.26328)  
+- 💻 [Code](https://github.com/NVlabs/Fast-dLLM)  
+- 🤗 [HuggingFace Model](https://huggingface.co/Efficient-Large-Model/Fast_dLLM_1.5B)

added_tokens.json

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+{
+  "</tool_call>": 151658,
+  "<tool_call>": 151657,
+  "<|box_end|>": 151649,
+  "<|box_start|>": 151648,
+  "<|endoftext|>": 151643,
+  "<|file_sep|>": 151664,
+  "<|fim_middle|>": 151660,
+  "<|fim_pad|>": 151662,
+  "<|fim_prefix|>": 151659,
+  "<|fim_suffix|>": 151661,
+  "<|im_end|>": 151645,
+  "<|im_start|>": 151644,
+  "<|image_pad|>": 151655,
+  "<|object_ref_end|>": 151647,
+  "<|object_ref_start|>": 151646,
+  "<|quad_end|>": 151651,
+  "<|quad_start|>": 151650,
+  "<|repo_name|>": 151663,
+  "<|video_pad|>": 151656,
+  "<|vision_end|>": 151653,
+  "<|vision_pad|>": 151654,
+  "<|vision_start|>": 151652,
+  "|<MASK>|": 151665
+}

assets/visualization_animation.gif

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+size 1362150

chat_template.jinja

@@ -0,0 +1,54 @@
+{%- if tools %}
+    {{- '<|im_start|>system\n' }}
+    {%- if messages[0]['role'] == 'system' %}
+        {{- messages[0]['content'] }}
+    {%- else %}
+        {{- 'You are a helpful assistant.' }}
+    {%- endif %}
+    {{- "\n\n# Tools\n\nYou may call one or more functions to assist with the user query.\n\nYou are provided with function signatures within <tools></tools> XML tags:\n<tools>" }}
+    {%- for tool in tools %}
+        {{- "\n" }}
+        {{- tool | tojson }}
+    {%- endfor %}
+    {{- "\n</tools>\n\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\n<tool_call>\n{\"name\": <function-name>, \"arguments\": <args-json-object>}\n</tool_call><|im_end|>\n" }}
+{%- else %}
+    {%- if messages[0]['role'] == 'system' %}
+        {{- '<|im_start|>system\n' + messages[0]['content'] + '<|im_end|>\n' }}
+    {%- else %}
+        {{- '<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n' }}
+    {%- endif %}
+{%- endif %}
+{%- for message in messages %}
+    {%- if (message.role == "user") or (message.role == "system" and not loop.first) or (message.role == "assistant" and not message.tool_calls) %}
+        {{- '<|im_start|>' + message.role + '\n' + message.content + '<|im_end|>' + '\n' }}
+    {%- elif message.role == "assistant" %}
+        {{- '<|im_start|>' + message.role }}
+        {%- if message.content %}
+            {{- '\n' + message.content }}
+        {%- endif %}
+        {%- for tool_call in message.tool_calls %}
+            {%- if tool_call.function is defined %}
+                {%- set tool_call = tool_call.function %}
+            {%- endif %}
+            {{- '\n<tool_call>\n{"name": "' }}
+            {{- tool_call.name }}
+            {{- '", "arguments": ' }}
+            {{- tool_call.arguments | tojson }}
+            {{- '}\n</tool_call>' }}
+        {%- endfor %}
+        {{- '<|im_end|>\n' }}
+    {%- elif message.role == "tool" %}
+        {%- if (loop.index0 == 0) or (messages[loop.index0 - 1].role != "tool") %}
+            {{- '<|im_start|>user' }}
+        {%- endif %}
+        {{- '\n<tool_response>\n' }}
+        {{- message.content }}
+        {{- '\n</tool_response>' }}
+        {%- if loop.last or (messages[loop.index0 + 1].role != "tool") %}
+            {{- '<|im_end|>\n' }}
+        {%- endif %}
+    {%- endif %}
+{%- endfor %}
+{%- if add_generation_prompt %}
+    {{- '<|im_start|>assistant\n' }}
+{%- endif %}

config.json

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+{
+  "architectures": [
+    "Fast_dLLM_QwenForCausalLM"
+  ],
+  "attention_dropout": 0.0,
+  "auto_map": {
+    "AutoConfig": "configuration.Fast_dLLM_QwenConfig",
+    "AutoModel": "modeling.Fast_dLLM_QwenModel",
+    "AutoModelForCausalLM": "modeling.Fast_dLLM_QwenForCausalLM"
+  },
+  "bd_size": 32,
+  "bos_token_id": 151643,
+  "eos_token_id": 151645,
+  "hidden_act": "silu",
+  "hidden_size": 1536,
+  "initializer_range": 0.02,
+  "intermediate_size": 8960,
+  "layer_types": [
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention",
+    "full_attention"
+  ],
+  "max_position_embeddings": 32768,
+  "max_window_layers": 21,
+  "model_type": "Fast_dLLM_Qwen",
+  "num_attention_heads": 12,
+  "num_hidden_layers": 28,
+  "num_key_value_heads": 2,
+  "pad_token_id": 151645,
+  "rms_norm_eps": 1e-06,
+  "rope_scaling": null,
+  "rope_theta": 1000000.0,
+  "sliding_window": null,
+  "tie_word_embeddings": true,
+  "torch_dtype": "bfloat16",
+  "transformers_version": "4.53.1",
+  "use_cache": true,
+  "use_sliding_window": false,
+  "vocab_size": 151936
+}

configuration.json

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+{"framework": "pytorch", "task": "others", "allow_remote": true}

configuration.py

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+"""Fast_dLLM_Qwen model configuration"""
+
+from transformers.configuration_utils import PretrainedConfig, layer_type_validation
+from transformers.modeling_rope_utils import rope_config_validation
+from transformers.utils import logging
+
+
+logger = logging.get_logger(__name__)
+
+
+class Fast_dLLM_QwenConfig(PretrainedConfig):
+
+    model_type = "Fast_dLLM_Qwen"
+    keys_to_ignore_at_inference = ["past_key_values"]
+
+    # Default tensor parallel plan for base model `Fast_dLLM_Qwen`
+    base_model_tp_plan = {
+        "layers.*.self_attn.q_proj": "colwise",
+        "layers.*.self_attn.k_proj": "colwise",
+        "layers.*.self_attn.v_proj": "colwise",
+        "layers.*.self_attn.o_proj": "rowwise",
+        "layers.*.mlp.gate_proj": "colwise",
+        "layers.*.mlp.up_proj": "colwise",
+        "layers.*.mlp.down_proj": "rowwise",
+    }
+    base_model_pp_plan = {
+        "embed_tokens": (["input_ids"], ["inputs_embeds"]),
+        "layers": (["hidden_states", "attention_mask"], ["hidden_states"]),
+        "norm": (["hidden_states"], ["hidden_states"]),
+    }
+
+    def __init__(
+        self,
+        vocab_size=151936,
+        hidden_size=4096,
+        intermediate_size=22016,
+        num_hidden_layers=32,
+        num_attention_heads=32,
+        num_key_value_heads=32,
+        hidden_act="silu",
+        max_position_embeddings=32768,
+        initializer_range=0.02,
+        rms_norm_eps=1e-6,
+        use_cache=True,
+        tie_word_embeddings=False,
+        rope_theta=10000.0,
+        rope_scaling=None,
+        use_sliding_window=False,
+        sliding_window=4096,
+        max_window_layers=28,
+        layer_types=None,
+        attention_dropout=0.0,
+        bd_size=32,
+        **kwargs,
+    ):
+        self.vocab_size = vocab_size
+        self.max_position_embeddings = max_position_embeddings
+        self.hidden_size = hidden_size
+        self.intermediate_size = intermediate_size
+        self.num_hidden_layers = num_hidden_layers
+        self.num_attention_heads = num_attention_heads
+        self.use_sliding_window = use_sliding_window
+        self.sliding_window = sliding_window if self.use_sliding_window else None
+        self.max_window_layers = max_window_layers
+
+        # for backward compatibility
+        if num_key_value_heads is None:
+            num_key_value_heads = num_attention_heads
+
+        self.num_key_value_heads = num_key_value_heads
+        self.hidden_act = hidden_act
+        self.initializer_range = initializer_range
+        self.rms_norm_eps = rms_norm_eps
+        self.use_cache = use_cache
+        self.rope_theta = rope_theta
+        self.rope_scaling = rope_scaling
+        self.attention_dropout = attention_dropout
+        self.bd_size = bd_size
+        # Validate the correctness of rotary position embeddings parameters
+        # BC: if there is a 'type' field, move it to 'rope_type'.
+        if self.rope_scaling is not None and "type" in self.rope_scaling:
+            self.rope_scaling["rope_type"] = self.rope_scaling["type"]
+        rope_config_validation(self)
+
+        self.layer_types = layer_types
+        if self.layer_types is None:
+            self.layer_types = [
+                "sliding_attention"
+                if self.sliding_window is not None and i >= self.max_window_layers
+                else "full_attention"
+                for i in range(self.num_hidden_layers)
+            ]
+        layer_type_validation(self.layer_types)
+
+        super().__init__(
+            tie_word_embeddings=tie_word_embeddings,
+            **kwargs,
+        )

generation_config.json

@@ -0,0 +1,14 @@
+{
+  "bos_token_id": 151643,
+  "do_sample": true,
+  "eos_token_id": [
+    151645,
+    151643
+  ],
+  "pad_token_id": 151643,
+  "repetition_penalty": 1.1,
+  "temperature": 0.7,
+  "top_k": 20,
+  "top_p": 0.8,
+  "transformers_version": "4.53.1"
+}

model.safetensors

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8d267bb8b935f2e15148ba1175b67dba70261a696ec931dd0a3b0f27f9f3c434
+size 3087467144

modeling.py

@@ -0,0 +1,866 @@
+from typing import Callable, Optional, Union
+from dataclasses import dataclass
+
+import torch
+from torch import nn
+import torch.nn.functional as F
+from functools import partial
+
+from transformers.generation.utils import GenerateDecoderOnlyOutput  
+from transformers.activations import ACT2FN
+from transformers.cache_utils import Cache, DynamicCache
+from transformers.generation import GenerationMixin
+from transformers.integrations import use_kernel_forward_from_hub
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.modeling_layers import GradientCheckpointingLayer
+from transformers.modeling_outputs import (
+    BaseModelOutputWithPast,
+    CausalLMOutputWithPast,
+)
+from transformers.modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
+from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
+from transformers.processing_utils import Unpack
+from transformers.utils import auto_docstring, can_return_tuple, logging
+from .configuration import Fast_dLLM_QwenConfig
+from torch.nn.attention.flex_attention import flex_attention, create_block_mask
+from einops import rearrange, repeat
+
+logger = logging.get_logger(__name__)
+
+
+@dataclass
+class CausalLMOutputWithPastAndBlockCache(CausalLMOutputWithPast):
+    block_past_key_values: Optional[Cache] = None
+
+@dataclass
+class BaseModelOutputWithPastAndBlockCache(BaseModelOutputWithPast):
+    block_past_key_values: Optional[Cache] = None
+
+
+@torch.compile(fullgraph=True, mode="max-autotune-no-cudagraphs")
+def fused_flex_attention(q, k, v, mask=None):
+    return flex_attention(q, k, v, block_mask=mask, enable_gqa=True)
+
+def block_diff_mask(b, h, q_idx, kv_idx, block_size=None, n=None):
+    """
+    Constructs the specialized block diffusion attention mask for training
+    composed of three masks:
+    - **Block Diagonal Mask (M_BD)**: Self-attention within noised blocks
+    - **Offset Block Causal Mask (M_OBC)**: Cross-attention for conditional context
+    - **Block Causal Mask (M_BC)**: Attention to update x0
+
+    Args:
+        b, h: Batch and head indices (ignored for mask logic).
+        q_idx, kv_idx: Query and Key indices.
+        seq_len: Total sequence length.
+        block_size: Defines the block structure.
+
+    Returns:
+        A boolean attention mask.
+    """
+    # Indicate whether token belongs to xt or x0
+    x0_flag_q = (q_idx >= n)
+    x0_flag_kv = (kv_idx >= n)
+
+    # Compute block indices
+    block_q = torch.where(x0_flag_q == 1,
+                        (q_idx - n) // block_size,
+                        q_idx // block_size)
+    block_kv = torch.where(x0_flag_kv == 1,
+                        (kv_idx - n) // block_size,
+                        kv_idx // block_size)
+
+    # **1. Block Diagonal Mask (M_BD) **
+    block_diagonal = (block_q == block_kv) & (x0_flag_q == x0_flag_kv)
+
+    # **2. Offset Block-Causal Mask (M_OBC) **
+    offset_block_causal = (
+    (block_q > block_kv)
+    & (x0_flag_kv == 1)
+    & (x0_flag_q == 0)
+    )
+
+    # **3. Block-Causal Mask (M_BC) **
+    block_causal = (block_q >= block_kv) & (x0_flag_kv == 1) & (x0_flag_q == 1)
+
+    # **4. Combine Masks **
+    return block_diagonal | offset_block_causal | block_causal
+
+def eval_block_diff_mask(q_idx, kv_idx, block_size=None):
+    # Compute block indices
+    block_q = q_idx // block_size
+    block_kv = kv_idx // block_size
+
+    return block_q >= block_kv
+
+class Fast_dLLM_QwenMLP(nn.Module):
+    def __init__(self, config):
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.intermediate_size = config.intermediate_size
+        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
+        self.act_fn = ACT2FN[config.hidden_act]
+
+    def forward(self, x):
+        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
+        return down_proj
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., : x.shape[-1] // 2]
+    x2 = x[..., x.shape[-1] // 2 :]
+    return torch.cat((-x2, x1), dim=-1)
+
+
+def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
+    """Applies Rotary Position Embedding to the query and key tensors.
+
+    Args:
+        q (`torch.Tensor`): The query tensor.
+        k (`torch.Tensor`): The key tensor.
+        cos (`torch.Tensor`): The cosine part of the rotary embedding.
+        sin (`torch.Tensor`): The sine part of the rotary embedding.
+        position_ids (`torch.Tensor`, *optional*):
+            Deprecated and unused.
+        unsqueeze_dim (`int`, *optional*, defaults to 1):
+            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
+            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
+            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
+            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
+            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
+            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
+    Returns:
+        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
+    """
+    cos = cos.unsqueeze(unsqueeze_dim)
+    sin = sin.unsqueeze(unsqueeze_dim)
+    q_embed = (q * cos) + (rotate_half(q) * sin)
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+    return q_embed, k_embed
+
+
+def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
+    """
+    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
+    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
+    """
+    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
+    if n_rep == 1:
+        return hidden_states
+    hidden_states = hidden_states[:, :, None, :, :].expand(batch, num_key_value_heads, n_rep, slen, head_dim)
+    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)
+
+
+class Fast_dLLM_QwenAttention(nn.Module):
+    """Multi-headed attention from 'Attention Is All You Need' paper"""
+
+    def __init__(self, config: Fast_dLLM_QwenConfig, layer_idx: int):
+        super().__init__()
+        self.config = config
+        self.layer_idx = layer_idx
+        self.head_dim = getattr(config, "head_dim", config.hidden_size // config.num_attention_heads)
+        self.num_key_value_groups = config.num_attention_heads // config.num_key_value_heads
+        self.scaling = self.head_dim**-0.5
+        self.attention_dropout = config.attention_dropout
+        self.is_causal = True
+        self.q_proj = nn.Linear(config.hidden_size, config.num_attention_heads * self.head_dim, bias=True)
+        self.k_proj = nn.Linear(config.hidden_size, config.num_key_value_heads * self.head_dim, bias=True)
+        self.v_proj = nn.Linear(config.hidden_size, config.num_key_value_heads * self.head_dim, bias=True)
+        self.o_proj = nn.Linear(config.num_attention_heads * self.head_dim, config.hidden_size, bias=False)
+        self.sliding_window = config.sliding_window if config.layer_types[layer_idx] == "sliding_attention" else None
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        position_embeddings: tuple[torch.Tensor, torch.Tensor],
+        attention_mask: Optional[torch.Tensor],
+        past_key_value: Optional[Cache] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        update_past_key_values: Optional[bool] = False,
+        block_past_key_values: Optional[Cache] = None,
+        replace_position: Optional[int] = None,
+        **kwargs: Unpack[FlashAttentionKwargs],
+    ) -> tuple[torch.Tensor, Optional[torch.Tensor], Optional[tuple[torch.Tensor]]]:
+        input_shape = hidden_states.shape[:-1]
+        hidden_shape = (*input_shape, -1, self.head_dim)
+
+        query_states = self.q_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        key_states = self.k_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+
+        cos, sin = position_embeddings
+        # query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)
+        if self.training:
+            #split q into two parts
+            q_1 = query_states[:,:,:query_states.shape[2]//2]
+            q_2 = query_states[:,:,query_states.shape[2]//2:]
+            #split k into two parts
+            k_1 = key_states[:,:,:key_states.shape[2]//2]
+            k_2 = key_states[:,:,key_states.shape[2]//2:]
+            q_1, k_1 = apply_rotary_pos_emb(q_1, k_1, cos, sin)
+            q_2, k_2 = apply_rotary_pos_emb(q_2, k_2, cos, sin)
+            query_states = torch.cat((q_1, q_2), dim=-2)
+            key_states = torch.cat((k_1, k_2), dim=-2)
+        else:
+            query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)
+
+        if block_past_key_values is not None:
+            if len(block_past_key_values) <= self.layer_idx:
+                cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position}
+                key_states, value_states = block_past_key_values.update(key_states, value_states, self.layer_idx, cache_kwargs)
+            else:
+                block_cache_key_states = block_past_key_values[self.layer_idx][0]
+                block_cache_value_states = block_past_key_values[self.layer_idx][1]
+                
+                block_cache_key_states[:, :, replace_position:replace_position+key_states.shape[2]] = key_states
+                block_cache_value_states[:, :, replace_position:replace_position+value_states.shape[2]] = value_states
+                key_states = block_cache_key_states
+                value_states = block_cache_value_states
+
+        if past_key_value is not None:
+            # sin and cos are specific to RoPE models; cache_position needed for the static cache
+            if update_past_key_values:
+                cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position}
+                key_states, value_states = past_key_value.update(key_states, value_states, self.layer_idx, cache_kwargs)
+            elif len(past_key_value) > self.layer_idx:
+                key_states = torch.cat((past_key_value[self.layer_idx][0], key_states), dim=-2)
+                value_states = torch.cat((past_key_value[self.layer_idx][1], value_states), dim=-2)
+
+        if self.training:
+            attn_output = fused_flex_attention(query_states, key_states, value_states, mask=attention_mask)
+            attn_output = attn_output.transpose(1, 2).contiguous()
+        else:
+            attention_interface = ALL_ATTENTION_FUNCTIONS["sdpa"]
+
+            attn_output, attn_weights = attention_interface(
+                self,
+                query_states,
+                key_states,
+                value_states,
+                attention_mask,
+                is_causal=False,
+                dropout=0.0 if not self.training else self.attention_dropout,
+                scaling=self.scaling,
+                sliding_window=self.sliding_window,  # main diff with Llama
+                **kwargs,
+            )
+
+        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
+        attn_output = self.o_proj(attn_output)
+        return attn_output
+
+@use_kernel_forward_from_hub("RMSNorm")
+class Fast_dLLM_QwenRMSNorm(nn.Module):
+    def __init__(self, hidden_size, eps=1e-6):
+        """
+        Fast_dLLM_QwenRMSNorm is equivalent to T5LayerNorm
+        """
+        super().__init__()
+        self.weight = nn.Parameter(torch.ones(hidden_size))
+        self.variance_epsilon = eps
+
+    def forward(self, hidden_states):
+        input_dtype = hidden_states.dtype
+        hidden_states = hidden_states.to(torch.float32)
+        variance = hidden_states.pow(2).mean(-1, keepdim=True)
+        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
+        return self.weight * hidden_states.to(input_dtype)
+
+    def extra_repr(self):
+        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"
+
+
+class Fast_dLLM_QwenDecoderLayer(GradientCheckpointingLayer):
+    def __init__(self, config: Fast_dLLM_QwenConfig, layer_idx: int):
+        super().__init__()
+        self.hidden_size = config.hidden_size
+
+        self.self_attn = Fast_dLLM_QwenAttention(config=config, layer_idx=layer_idx)
+
+        self.mlp = Fast_dLLM_QwenMLP(config)
+        self.input_layernorm = Fast_dLLM_QwenRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = Fast_dLLM_QwenRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.attention_type = config.layer_types[layer_idx]
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_value: Optional[Cache] = None,
+        use_cache: Optional[bool] = False,
+        cache_position: Optional[torch.LongTensor] = None,
+        position_embeddings: Optional[tuple[torch.Tensor, torch.Tensor]] = None,  # necessary, but kept here for BC
+        update_past_key_values: Optional[bool] = False,
+        use_block_cache: Optional[bool] = False,
+        block_past_key_values: Optional[Cache] = None,
+        replace_position: Optional[int] = None,
+        **kwargs
+    ) -> tuple[torch.Tensor]:
+        residual = hidden_states
+        hidden_states = self.input_layernorm(hidden_states)
+        # Self Attention
+        hidden_states = self.self_attn(
+            hidden_states=hidden_states,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_value=past_key_value,
+            use_cache=use_cache,
+            cache_position=cache_position,
+            position_embeddings=position_embeddings,
+            update_past_key_values=update_past_key_values,
+            use_block_cache=use_block_cache,
+            block_past_key_values=block_past_key_values,
+            replace_position=replace_position,
+            **kwargs,
+        )
+        hidden_states = residual + hidden_states
+
+        # Fully Connected
+        residual = hidden_states
+        hidden_states = self.post_attention_layernorm(hidden_states)
+        hidden_states = self.mlp(hidden_states)
+        hidden_states = residual + hidden_states
+        return hidden_states
+
+
+
+class Fast_dLLM_QwenPreTrainedModel(PreTrainedModel):
+    config_class = Fast_dLLM_QwenConfig
+    base_model_prefix = "model"
+    supports_gradient_checkpointing = True
+    _no_split_modules = ["Fast_dLLM_QwenDecoderLayer"]
+    _skip_keys_device_placement = ["past_key_values"]
+    _supports_flash_attn_2 = True
+    _supports_sdpa = True
+    _supports_flex_attn = True
+    _supports_cache_class = True
+    _supports_quantized_cache = True
+    _supports_static_cache = True
+    _supports_attention_backend = True
+    _can_record_outputs = {
+        "hidden_states": Fast_dLLM_QwenDecoderLayer,
+        "attentions": Fast_dLLM_QwenAttention,
+    }
+
+    def _init_weights(self, module):
+        std = self.config.initializer_range
+        if isinstance(module, nn.Linear):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.bias is not None:
+                module.bias.data.zero_()
+        elif isinstance(module, nn.Embedding):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.padding_idx is not None:
+                module.weight.data[module.padding_idx].zero_()
+        elif isinstance(module, Fast_dLLM_QwenRMSNorm):
+            module.weight.data.fill_(1.0)
+
+
+class Fast_dLLM_QwenRotaryEmbedding(nn.Module):
+    def __init__(self, config: Fast_dLLM_QwenConfig, device=None):
+        super().__init__()
+        # BC: "rope_type" was originally "type"
+        if hasattr(config, "rope_scaling") and isinstance(config.rope_scaling, dict):
+            self.rope_type = config.rope_scaling.get("rope_type", config.rope_scaling.get("type"))
+        else:
+            self.rope_type = "default"
+        self.max_seq_len_cached = config.max_position_embeddings
+        self.original_max_seq_len = config.max_position_embeddings
+
+        self.config = config
+        self.rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]
+
+        inv_freq, self.attention_scaling = self.rope_init_fn(self.config, device)
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+        self.original_inv_freq = self.inv_freq
+
+    @torch.no_grad()
+    @dynamic_rope_update  # power user: used with advanced RoPE types (e.g. dynamic rope)
+    def forward(self, x, position_ids):
+        inv_freq_expanded = self.inv_freq[None, :, None].float().expand(position_ids.shape[0], -1, 1).to(x.device)
+        position_ids_expanded = position_ids[:, None, :].float()
+
+        device_type = x.device.type if isinstance(x.device.type, str) and x.device.type != "mps" else "cpu"
+        with torch.autocast(device_type=device_type, enabled=False):  # Force float32
+            freqs = (inv_freq_expanded.float() @ position_ids_expanded.float()).transpose(1, 2)
+            emb = torch.cat((freqs, freqs), dim=-1)
+            cos = emb.cos() * self.attention_scaling
+            sin = emb.sin() * self.attention_scaling
+
+        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)
+
+
+
+class Fast_dLLM_QwenModel(Fast_dLLM_QwenPreTrainedModel):
+    def __init__(self, config: Fast_dLLM_QwenConfig):
+        super().__init__(config)
+        self.padding_idx = config.pad_token_id
+        self.vocab_size = config.vocab_size
+        self.bd_size = config.bd_size
+
+        self.embed_tokens = nn.Embedding(config.vocab_size, config.hidden_size, self.padding_idx)
+        self.layers = nn.ModuleList(
+            [Fast_dLLM_QwenDecoderLayer(config, layer_idx) for layer_idx in range(config.num_hidden_layers)]
+        )
+        self.norm = Fast_dLLM_QwenRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.rotary_emb = Fast_dLLM_QwenRotaryEmbedding(config=config)
+        self.gradient_checkpointing = True
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    def get_input_embeddings(self):
+        return self.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.embed_tokens = value
+
+
+    def eval_mask(self, seqlen, block_size, cache_seq_len):
+        q_indices = torch.arange(seqlen) + cache_seq_len
+        k_indices = torch.arange(seqlen + cache_seq_len)
+        mask = eval_block_diff_mask(
+            q_idx=q_indices[:, None], 
+            kv_idx=k_indices[None, :], 
+            block_size=block_size
+        )
+        return mask
+
+    def gen_mask(self, seqlen, block_size, B, H):
+        mask = create_block_mask(
+            partial(block_diff_mask, block_size=block_size, n=seqlen),
+            B=B, H=H, Q_LEN=seqlen*2, KV_LEN=seqlen*2)
+
+        return mask
+
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        update_past_key_values: Optional[bool] = False,
+        block_size: Optional[int] = 32,
+        use_block_cache: Optional[bool] = False,
+        block_past_key_values: Optional[Cache] = None,
+        replace_position: Optional[int] = None,
+        **kwargs
+    ) -> BaseModelOutputWithPast:
+        if (input_ids is None) ^ (inputs_embeds is not None):
+            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")
+
+        if inputs_embeds is None:
+            inputs_embeds = self.embed_tokens(input_ids)
+
+        if use_cache and past_key_values is None:
+            past_key_values = DynamicCache()
+
+        if use_block_cache and block_past_key_values is None:
+            block_past_key_values = DynamicCache()
+
+        if cache_position is None:
+            past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
+            if self.training:
+                cache_position = torch.arange(
+                    past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1]//2, device=inputs_embeds.device
+                )
+            else:
+                if use_block_cache:
+                    block_start_position = past_seen_tokens+replace_position if replace_position is not None else past_seen_tokens
+                    cache_position = torch.arange(
+                        block_start_position, block_start_position + inputs_embeds.shape[1], device=inputs_embeds.device
+                    )
+                else:
+                    cache_position = torch.arange(
+                        past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1] if not self.training else inputs_embeds.shape[1]//2, device=inputs_embeds.device
+                    )
+
+        if position_ids is None:
+            position_ids = cache_position.unsqueeze(0)
+        
+        if self.training:
+            attention_mask = self.gen_mask(labels.shape[1], self.bd_size, labels.shape[0], self.config.num_attention_heads).to(device=inputs_embeds.device)
+        else:
+            if use_block_cache and block_past_key_values.get_seq_length() != 0:
+                attention_mask = None
+            else:
+                attention_mask = self.eval_mask(input_ids.shape[1], block_size, past_key_values.get_seq_length() if past_key_values is not None else 0).to(device=inputs_embeds.device)
+
+        hidden_states = inputs_embeds
+
+        # create position embeddings to be shared across the decoder layers
+        position_embeddings = self.rotary_emb(hidden_states, position_ids)
+
+        for decoder_layer in self.layers[: self.config.num_hidden_layers]:
+            hidden_states = decoder_layer(
+                hidden_states,
+                attention_mask=attention_mask,
+                position_ids=position_ids,
+                past_key_value=past_key_values,
+                use_cache=use_cache,
+                cache_position=cache_position,
+                position_embeddings=position_embeddings,
+                update_past_key_values=update_past_key_values,
+                use_block_cache=use_block_cache,
+                block_past_key_values=block_past_key_values,
+                replace_position=replace_position,
+                **kwargs,
+            )
+
+        hidden_states = self.norm(hidden_states)
+        return BaseModelOutputWithPastAndBlockCache(
+            last_hidden_state=hidden_states,
+            past_key_values=past_key_values if use_cache else None,
+            block_past_key_values=block_past_key_values if use_block_cache else None,
+        )
+
+
+class Fast_dLLM_QwenForCausalLM(Fast_dLLM_QwenPreTrainedModel, GenerationMixin):
+    _tied_weights_keys = ["lm_head.weight"]
+    _tp_plan = {"lm_head": "colwise_rep"}
+    _pp_plan = {"lm_head": (["hidden_states"], ["logits"])}
+
+    def __init__(self, config):
+        super().__init__(config)
+        self.model = Fast_dLLM_QwenModel(config)
+        self.vocab_size = config.vocab_size
+        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    def get_input_embeddings(self):
+        return self.model.embed_tokens
+
+    def set_input_embeddings(self, value):
+        self.model.embed_tokens = value
+
+    def get_output_embeddings(self):
+        return self.lm_head
+
+    def set_output_embeddings(self, new_embeddings):
+        self.lm_head = new_embeddings
+
+    def set_decoder(self, decoder):
+        self.model = decoder
+
+    def get_decoder(self):
+        return self.model
+
+    @can_return_tuple
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        use_cache: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        logits_to_keep: Union[int, torch.Tensor] = 0,
+        update_past_key_values: Optional[bool] = False,
+        block_size: Optional[int] = 32,
+        use_block_cache: Optional[bool] = False,
+        block_past_key_values: Optional[Cache] = None,
+        replace_position: Optional[int] = None,
+        mask_id: Optional[int] = 151665,
+        **kwargs
+    ) -> CausalLMOutputWithPastAndBlockCache:
+
+        if self.training:
+            original_labels = labels.clone()
+            original_input_ids = input_ids.clone()
+
+            noisy_input_ids = input_ids.clone()
+
+            input_ids = input_ids.reshape(input_ids.shape[0] * input_ids.shape[1] // self.model.bd_size, self.model.bd_size)
+            b, l = input_ids.shape
+            t = torch.rand((b,), device=input_ids.device)
+            eps=1e-3
+            p_mask = (1 - eps) * t + eps
+            p_mask = p_mask[:, None].repeat(1, l)
+
+            mask_indices = torch.rand((b, l), device=input_ids.device) < p_mask
+            x_t = torch.where(mask_indices, mask_id, input_ids).reshape(labels.shape)
+            noisy_input_ids[labels != -100] = x_t[labels != -100]
+            mask = (noisy_input_ids != mask_id)
+            labels[mask] = -100
+            input_ids = torch.cat([noisy_input_ids, input_ids.reshape(labels.shape)], dim=1)
+
+            complementary_noisy_input_ids = original_input_ids.clone()
+            complementary_labels = original_labels.clone()
+
+            complementary_input_ids = original_input_ids.reshape(original_input_ids.shape[0] * original_input_ids.shape[1] // self.model.bd_size, self.model.bd_size)
+
+            complementary_mask_indices = ~mask_indices
+            complementary_x_t = torch.where(complementary_mask_indices, mask_id, complementary_input_ids).reshape(labels.shape)
+            complementary_noisy_input_ids[complementary_labels != -100] = complementary_x_t[complementary_labels != -100]
+            complementary_mask = (complementary_noisy_input_ids != mask_id)
+            complementary_labels[complementary_mask] = -100
+            complementary_input_ids = torch.cat([complementary_noisy_input_ids, complementary_input_ids.reshape(complementary_labels.shape)], dim=1)
+
+            input_ids = torch.cat([input_ids, complementary_input_ids], dim=0)
+            labels = torch.cat([labels, complementary_labels], dim=0)
+
+        outputs: BaseModelOutputWithPastAndBlockCache = self.model(
+            input_ids=input_ids,
+            labels=labels,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            inputs_embeds=inputs_embeds,
+            use_cache=use_cache,
+            cache_position=cache_position,
+            update_past_key_values=update_past_key_values,
+            block_size=block_size,
+            use_block_cache=use_block_cache,
+            block_past_key_values=block_past_key_values,
+            replace_position=replace_position,
+            **kwargs,
+        )
+
+        hidden_states = outputs.last_hidden_state
+        if self.training:
+            hidden_states = hidden_states[:, :hidden_states.shape[1]//2, :]
+        # Only compute necessary logits, and do not upcast them to float if we are not computing the loss
+        slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
+        logits = self.lm_head(hidden_states[:, slice_indices, :])
+
+        loss = None
+        if labels is not None:
+            loss = self.loss_function(logits=logits, labels=labels, vocab_size=self.config.vocab_size, **kwargs)
+
+        return CausalLMOutputWithPastAndBlockCache(
+            loss=loss,
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            hidden_states=hidden_states,
+            attentions=outputs.attentions,
+            block_past_key_values=outputs.block_past_key_values,
+        )
+
+    @torch.no_grad()
+    def generate(
+        self,
+        input_ids,
+        max_new_tokens=None,
+        max_length=None,
+        tokenizer=None,
+        mask_id=151665,
+        threshold=1,
+        small_block_size=8,
+        block_size=32,
+        stop_token=151645,
+        stopping_criteria=None,
+        top_p=0.95,
+        temperature=0,
+        use_block_cache=False,
+        return_dict_in_generate=False,
+        output_scores=False,
+        output_hidden_states=False,
+        **kwargs
+    ):
+        if max_new_tokens is None and max_length is None:
+            raise ValueError("Either max_new_tokens or max_length must be specified")
+        if max_new_tokens is None:
+            max_new_tokens = max_length - input_ids.shape[1]
+        
+        scores_list = [] if output_scores else None
+        decoder_hidden_states = [] if output_hidden_states else None
+        
+        num_blocks = max_new_tokens // block_size
+        original_input_length = input_ids.shape[1]
+
+        if input_ids.shape[1] > block_size:
+            output = self.forward(
+                input_ids=input_ids[:, :(input_ids.shape[1] // block_size * block_size)], 
+                use_cache=True, 
+                update_past_key_values=True, 
+                block_size=block_size
+            )
+            logits, past_key_values = output.logits, output.past_key_values
+            
+            if output_scores:
+                scores_list.append(logits)
+            if output_hidden_states and hasattr(output, 'hidden_states'):
+                decoder_hidden_states.append(output.hidden_states)
+            
+            if input_ids.shape[1] % block_size == 0:
+                next_token = logits[:, -1:, :].argmax(dim=-1)
+                input_ids = torch.cat([input_ids, next_token], dim=1)
+        else:
+            past_key_values = None
+
+        num_small_blocks = block_size // small_block_size
+
+        for block_idx in range(num_blocks):
+            if stop_token in input_ids[:, original_input_length:]:
+                break
+            prompt_length = input_ids.shape[1]
+            # Initialize x_init with mask_id
+            x_init = mask_id * torch.ones(
+                (input_ids.shape[0], block_size-prompt_length%block_size), 
+                device=self.device, 
+                dtype=torch.long
+            )
+            x_init = torch.cat([input_ids, x_init], dim=1)
+
+            x_t = x_init.clone()
+            block_past_key_values = None
+            
+            while True:
+                if stop_token in x_t[:, prompt_length:]:
+                    stop_token_idx = (x_t[:, prompt_length:] == stop_token).nonzero()[0][1]
+                    if (x_t[:, prompt_length:prompt_length+stop_token_idx] == mask_id).sum() == 0:
+                        break
+                mask_idx = (x_t[:, -block_size:] == mask_id)
+                
+                # Decode a complete block, update cache, and generate the next token
+                if mask_idx.sum() == 0:
+                    output = self.forward(
+                        input_ids=x_t[:, -block_size:], 
+                        use_cache=True, 
+                        past_key_values=past_key_values, 
+                        update_past_key_values=True, 
+                        block_size=block_size
+                    )
+                    logits, past_key_values = output.logits, output.past_key_values
+                    
+                    # 收集输出信息
+                    if output_scores:
+                        scores_list.append(logits)
+                    if output_hidden_states and hasattr(output, 'hidden_states'):
+                        decoder_hidden_states.append(output.hidden_states)
+                    
+                    next_token = logits[:, -1:, :].argmax(dim=-1)
+                    x_t = torch.cat([x_t, next_token], dim=1)
+                    break
+                    
+                for small_block_idx in range(num_small_blocks):
+                    small_block_start_idx = small_block_idx * small_block_size
+                    small_block_end_idx = small_block_start_idx + small_block_size
+
+                    start = -block_size + small_block_start_idx
+                    end = None if block_size == small_block_end_idx else -block_size + small_block_end_idx
+                    
+                    while True:
+                        mask_idx = (x_t[:, -block_size:] == mask_id)
+                        if mask_idx[:, start:end].sum() == 0:
+                            break
+                        if stop_token in x_t[:, prompt_length:]:
+                            stop_token_idx = (x_t[:, prompt_length:] == stop_token).nonzero()[0][1]
+                            if (x_t[:, prompt_length:prompt_length+stop_token_idx] == mask_id).sum() == 0:
+                                break
+
+                        if use_block_cache:
+                            if block_past_key_values is None or (x_t[:, -block_size+small_block_start_idx] == mask_id).any():
+                                output = self.forward(
+                                    input_ids=x_t[:, -block_size:], 
+                                    use_cache=True, 
+                                    past_key_values=past_key_values, 
+                                    update_past_key_values=False, 
+                                    use_block_cache=True,
+                                )
+                                logits, block_past_key_values = output.logits, output.block_past_key_values
+                                logits = torch.cat([logits[:, :1, :], logits[:, :-1, :]], dim=1)
+                                logits = logits[:, start:end]
+                            else:
+                                output = self.forward(
+                                    input_ids=x_t[:,start:end], 
+                                    use_cache=True, 
+                                    past_key_values=past_key_values, 
+                                    update_past_key_values=False, 
+                                    use_block_cache=True, 
+                                    block_past_key_values=block_past_key_values, 
+                                    replace_position=small_block_start_idx
+                                )
+                                logits = output.logits
+                                logits = torch.cat([logits[:, :1, :], logits[:, :-1, :]], dim=1)
+                        else:
+                            output = self.forward(
+                                input_ids=x_t[:, -block_size:], 
+                                use_cache=True, 
+                                past_key_values=past_key_values, 
+                                update_past_key_values=False
+                            )
+                            logits = output.logits
+                            logits = torch.cat([logits[:, :1, :], logits[:, :-1, :]], dim=1)
+                            logits = logits[:, start:end]
+
+                        if output_scores:
+                            scores_list.append(logits)
+                        if output_hidden_states and hasattr(output, 'hidden_states'):
+                            decoder_hidden_states.append(output.hidden_states)
+
+                        x_1, p_1t = self.sample_with_top_p(logits, top_p=top_p, temperature=temperature)
+                        # Select tokens with probability greater than threshold from p_1t
+                        x1_p = torch.squeeze(torch.gather(p_1t, dim=-1, index=torch.unsqueeze(x_1, -1)), -1)
+                        x1_p = torch.where(mask_idx[:, start:end], x1_p, -torch.inf)
+
+                        unmask_idx = (x1_p > threshold)
+                        max_prob_idx = x1_p.argmax(dim=-1)
+                        unmask_idx[torch.arange(x_1.shape[0]), max_prob_idx] = True
+                        unmask_idx = unmask_idx & mask_idx[:, start:end]
+
+                        x_t[:, start:end][unmask_idx] = x_1[unmask_idx]
+
+            input_ids = x_t
+            
+        # Truncate stop_token
+        if stop_token in input_ids[:, original_input_length:]:
+            stop_token_idx = (input_ids[:, original_input_length:] == stop_token).nonzero()[0][1]
+            input_ids = input_ids[:, :stop_token_idx+original_input_length+1]
+        
+        if return_dict_in_generate:
+            return GenerateDecoderOnlyOutput(
+                sequences=input_ids,
+                scores=tuple(scores_list) if output_scores and scores_list else None,
+                hidden_states=tuple(decoder_hidden_states) if output_hidden_states and decoder_hidden_states else None,
+            )
+        else:
+            return input_ids
+
+
+    def sample_with_top_p(self, logits, top_p=0.95, temperature=1.0):
+        # Calculate probabilities
+        if temperature > 0:
+            scaled_logits = logits / temperature
+        else:
+            p_1t = torch.softmax(logits, dim=-1)
+            x_1 = p_1t.argmax(dim=-1)
+            return x_1, p_1t
+                            
+        probs = F.softmax(scaled_logits, dim=-1)
+
+        sorted_probs, sorted_indices = torch.sort(probs, descending=True)
+        cumulative_probs = torch.cumsum(sorted_probs, dim=-1)
+
+        sorted_indices_to_remove = cumulative_probs > top_p
+        sorted_indices_to_remove[..., 1:] = sorted_indices_to_remove[..., :-1].clone()
+        sorted_indices_to_remove[..., 0] = 0
+
+        indices_to_remove = torch.zeros_like(probs, dtype=torch.bool).scatter_(
+            dim=-1, index=sorted_indices, src=sorted_indices_to_remove
+        )
+        
+        probs[indices_to_remove] = 0
+
+        # Renormalize so that the probabilities of remaining tokens sum to 1
+        # Add a small epsilon value to prevent division by zero
+        probs_sum = torch.sum(probs, dim=-1, keepdim=True)
+        normalized_probs = probs / probs_sum
+
+        p_1t = normalized_probs
+        x_1 = torch.multinomial(p_1t[0], num_samples=1).unsqueeze(0).squeeze(-1)
+
+        return x_1, p_1t

special_tokens_map.json

@@ -0,0 +1,25 @@
+{
+  "additional_special_tokens": [
+    {
+      "content": "|<MASK>|",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false
+    }
+  ],
+  "eos_token": {
+    "content": "<|im_end|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "pad_token": {
+    "content": "<|endoftext|>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  }
+}

tokenizer.json

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:cb2105b66192c5a532e2a098dc899df86eca233b4faa48461211e4312c8b3568
+size 11422081

tokenizer_config.json

@@ -0,0 +1,204 @@
+{
+  "add_bos_token": false,
+  "add_prefix_space": false,
+  "added_tokens_decoder": {
+    "151643": {
+      "content": "<|endoftext|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151644": {
+      "content": "<|im_start|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151645": {
+      "content": "<|im_end|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151646": {
+      "content": "<|object_ref_start|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151647": {
+      "content": "<|object_ref_end|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151648": {
+      "content": "<|box_start|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151649": {
+      "content": "<|box_end|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151650": {
+      "content": "<|quad_start|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151651": {
+      "content": "<|quad_end|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151652": {
+      "content": "<|vision_start|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151653": {
+      "content": "<|vision_end|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151654": {
+      "content": "<|vision_pad|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151655": {
+      "content": "<|image_pad|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151656": {
+      "content": "<|video_pad|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    },
+    "151657": {
+      "content": "<tool_call>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151658": {
+      "content": "</tool_call>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151659": {
+      "content": "<|fim_prefix|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151660": {
+      "content": "<|fim_middle|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151661": {
+      "content": "<|fim_suffix|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151662": {
+      "content": "<|fim_pad|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151663": {
+      "content": "<|repo_name|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151664": {
+      "content": "<|file_sep|>",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": false
+    },
+    "151665": {
+      "content": "|<MASK>|",
+      "lstrip": false,
+      "normalized": false,
+      "rstrip": false,
+      "single_word": false,
+      "special": true
+    }
+  },
+  "additional_special_tokens": [
+    "|<MASK>|"
+  ],
+  "bos_token": null,
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "<|im_end|>",
+  "errors": "replace",
+  "extra_special_tokens": {},
+  "model_max_length": 131072,
+  "pad_token": "<|endoftext|>",
+  "padding_side": "right",
+  "split_special_tokens": false,
+  "tokenizer_class": "Qwen2Tokenizer",
+  "unk_token": null
+}