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Model: openbmb/BitCPM4-CANN-1B Source: Original Platform
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README.md
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---
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license: apache-2.0
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language:
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- zh
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- en
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pipeline_tag: text-generation
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library_name: transformers
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---
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<div align="center">
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<img src="https://github.com/OpenBMB/MiniCPM/blob/main/assets/minicpm_logo.png?raw=true" width="500em" ></img>
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</div>
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<p align="center">
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<a href="https://github.com/OpenBMB/MiniCPM/" target="_blank">GitHub Repo</a> |
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<a href="https://github.com/OpenBMB/MiniCPM/blob/main/docs/BitCPM_CANN.pdf" target="_blank">Technical Report</a>
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</p>
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<p align="center">
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👋 Join us on <a href="https://discord.gg/3cGQn9b3YM" target="_blank">Discord</a> and <a href="https://github.com/OpenBMB/MiniCPM/blob/main/assets/wechat.jpg" target="_blank">WeChat</a>
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</p>
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## Introduction
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BitCPM-CANN is the first end-to-end 1.58-bit (ternary) large language model training system natively built on Huawei Ascend NPU. The system integrates quantization-aware training (QAT) into the Megatron-LM framework with MindSpeed acceleration, covering the full training stack from custom ternary operators to distributed parallel training on Ascend 910B.
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We train a family of four models—BitCPM-CANN-0.5B/1B/3B/8B—and evaluate them against their full-precision MiniCPM4 counterparts across 11 benchmarks. The 1B/3B/8B models retain **95.7%–97.2%** of full-precision performance, while enabling approximately **6× memory reduction** at inference time. QAT introduces only **5% training throughput overhead** (148 vs. 155 TFLOP/s per NPU).
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### Key Features
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- 🔬 **1.58-Bit Ternary Quantization**: Compresses model weights to ternary values {-1, 0, 1}, achieving ~90% bit-width reduction compared to BF16.
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- 🖥️ **Native Ascend NPU Training**: First publicly reported 1.58-bit training effort on domestic NPU platform at 8B scale, establishing reusable low-bit training infrastructure for the Ascend ecosystem.
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- ⚡ **Minimal Training Overhead**: Only 5% throughput degradation compared to full-precision training on Ascend 910B.
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- 📦 **~6× Inference Memory Reduction**: Enables longer contexts, more serving replicas, and edge deployment on consumer devices.
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### Important Note
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> The models in this repository are in **pseudo-quantized (fake quantization) format**. This means the weights are stored in standard floating-point format with ternary values already applied during training. You can load and run inference with these models **exactly the same way as full-precision models**—no special quantization libraries or custom kernels are required.
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## BitCPM-CANN Model Family
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| Model | HuggingFace | GGUF |
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|-------|-------------|------|
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| BitCPM-CANN-0.5B | [openbmb/BitCPM-CANN-0.5B](https://huggingface.co/openbmb/BitCPM-CANN-0.5B) | [openbmb/BitCPM-CANN-0.5B-gguf](https://huggingface.co/openbmb/BitCPM-CANN-0.5B-gguf) |
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| BitCPM-CANN-1B | [openbmb/BitCPM-CANN-1B](https://huggingface.co/openbmb/BitCPM-CANN-1B) | [openbmb/BitCPM-CANN-1B-gguf](https://huggingface.co/openbmb/BitCPM-CANN-1B-gguf) |
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| BitCPM-CANN-3B | [openbmb/BitCPM-CANN-3B](https://huggingface.co/openbmb/BitCPM-CANN-3B) | [openbmb/BitCPM-CANN-3B-gguf](https://huggingface.co/openbmb/BitCPM-CANN-3B-gguf) |
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| BitCPM-CANN-8B | [openbmb/BitCPM-CANN-8B](https://huggingface.co/openbmb/BitCPM-CANN-8B) | [openbmb/BitCPM-CANN-8B-gguf](https://huggingface.co/openbmb/BitCPM-CANN-8B-gguf) |
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## Usage
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### Inference with Transformers
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Since BitCPM-CANN models are in pseudo-quantized format, you can use them exactly like standard full-precision models:
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```python
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from transformers import AutoModelForCausalLM, AutoTokenizer
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import torch
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torch.manual_seed(0)
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path = 'openbmb/BitCPM-CANN-1B'
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device = "cuda"
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tokenizer = AutoTokenizer.from_pretrained(path)
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model = AutoModelForCausalLM.from_pretrained(path, torch_dtype=torch.bfloat16, device_map=device, trust_remote_code=True)
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# User can directly use the chat interface
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responds, history = model.chat(tokenizer, "Write an article about Artificial Intelligence.", temperature=0.7, top_p=0.7)
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print(responds)
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# User can also use the generate interface
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# messages = [
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# {"role": "user", "content": "Write an article about Artificial Intelligence."},
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# ]
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# prompt_text = tokenizer.apply_chat_template(
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# messages,
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# tokenize=False,
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# add_generation_prompt=True,
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# )
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# model_inputs = tokenizer([prompt_text], return_tensors="pt").to(device)
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# model_outputs = model.generate(
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# **model_inputs,
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# max_new_tokens=1024,
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# top_p=0.7,
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# temperature=0.7
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# )
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# output_token_ids = [
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# model_outputs[i][len(model_inputs[i]):] for i in range(len(model_inputs['input_ids']))
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# ]
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# responses = tokenizer.batch_decode(output_token_ids, skip_special_tokens=True)[0]
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# print(responses)
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```
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## Evaluation Results
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### Main Results
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BitCPM-CANN models are evaluated against their full-precision MiniCPM4 counterparts across 11 benchmarks spanning commonsense reasoning, domain knowledge, and mathematics & reasoning.
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| Task | 8B FP | 8B Ternary | 3B FP | 3B Ternary | 1B FP | 1B Ternary | 0.5B FP | 0.5B Ternary |
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|------|-------|------------|-------|------------|-------|------------|---------|--------------|
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| ARC-c | 87.46 | 86.10 | 80.34 | 78.98 | 64.41 | 67.12 | 51.86 | 50.51 |
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| ARC-e | 95.06 | 93.47 | 92.77 | 88.36 | 79.89 | 79.01 | 71.78 | 65.08 |
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| BoolQ | 84.89 | 83.39 | 79.85 | 77.89 | 68.38 | 65.50 | 62.29 | 43.55 |
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| PIQA | 80.52 | 78.78 | 70.57 | 72.69 | 66.16 | 65.45 | 60.99 | 58.49 |
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| WinoGrande | 63.30 | 61.17 | 58.41 | 52.96 | 51.62 | 53.28 | 51.07 | 51.54 |
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| CMMLU | 80.62 | 78.92 | 78.11 | 76.53 | 74.57 | 67.42 | 65.22 | 60.49 |
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| C-Eval | 81.36 | 77.50 | 75.85 | 75.89 | 73.25 | 65.96 | 66.11 | 60.74 |
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| MMLU | 75.83 | 70.65 | 66.95 | 64.41 | 57.71 | 57.71 | 55.55 | 50.73 |
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| MMLU-Redux | 77.14 | 69.85 | 65.82 | 60.07 | 54.80 | 54.16 | 48.00 | 43.79 |
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| BBH | 76.72 | 70.70 | 68.29 | 68.30 | 64.40 | 60.40 | 49.87 | 47.44 |
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| GSM8K | 91.51 | 85.75 | 81.64 | 79.45 | 63.15 | 61.56 | 52.08 | 39.42 |
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| **Average (11 tasks)** | **81.31** | **77.84** | **74.42** | **72.32** | **65.30** | **63.42** | **57.71** | **51.98** |
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| **Retention** | | **95.7%** | | **97.2%** | | **97.1%** | | **90.1%** |
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### Key Observations
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- **1B and above achieve ≥95.7% retention**: The 3B model achieves the highest retention at 97.2%, demonstrating that ternary QAT at this scale introduces minimal capability loss.
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- **0.5B reveals scale-dependent sensitivity**: The smallest model retains 90.1%, indicating that quantization perturbation is more damaging when model capacity is limited.
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- **1:1 alignment with MiniCPM4**: The matched evaluation enables direct substitution decisions—deployments can replace specific full-precision models with their ternary counterparts with clearly quantified trade-offs.
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### Training Efficiency
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| Configuration | TFLOP/s per NPU | Overhead |
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|---------------|-----------------|----------|
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| Full-precision | 155 | — |
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| Ternary QAT | 148 | 4.5% |
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System-level throughput on 2-node 16-card Ascend 910C:
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- 3B model: ~2700 tokens/s per card
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- 8B model: ~1340 tokens/s per card
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## Technical Approach
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BitCPM-CANN uses a ternary quantizer that maps each weight group to {-1, 0, 1} scaled by a group-wise factor, trained with Straight-Through Estimator (STE) for gradient flow. The training follows a two-stage strategy: **complete QAT followed by post-training distillation**, which avoids amplifying training instability during early training.
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The system is built as a four-layer vertical stack on Ascend NPU:
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1. **QAT Training Logic**: Ternary quantizer with STE, pluggable quantization layers in Megatron-LM.
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2. **Megatron-LM Quantized Model Layer**: Tensor-parallel linear layers with integrated weight/activation quantizers.
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3. **Framework Entry Layer**: `torch_npu` and `mindspeed.megatron_adaptor` injection for NPU execution.
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4. **Ascend Software-Hardware Stack**: MindSpeed, CANN, HCCL communication, Ascend 910B NPU hardware.
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For full technical details, please refer to our [Technical Report](https://github.com/OpenBMB/MiniCPM/blob/main/docs/BitCPM_CANN.pdf).
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## Statement
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- As a language model, BitCPM-CANN generates content by learning from a vast amount of text.
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- However, it does not possess the ability to comprehend or express personal opinions or value judgments.
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- Any content generated by BitCPM-CANN does not represent the viewpoints or positions of the model developers.
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- Therefore, when using content generated by BitCPM-CANN, users should take full responsibility for evaluating and verifying it on their own.
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## LICENSE
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- This repository and BitCPM-CANN models are released under the [Apache-2.0](https://github.com/OpenBMB/MiniCPM/blob/main/LICENSE) License.
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## Citation
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- Please cite our technical report if you find our work valuable.
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```bibtex
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@article{bitcpmcann,
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title={{BitCPM-CANN}: Native 1.58-Bit Large Language Model Training on Ascend NPU},
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author={BitCPM Team},
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year={2026}
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}
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```
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{
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"_name_or_path": "openbmb/CPM-2B",
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"architectures": [
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"LlamaForCausalLM"
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],
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"bos_token_id": 1,
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"eos_token_id": [2,73440],
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"pad_token_id": 2,
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"hidden_act": "silu",
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"hidden_size": 2048,
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"initializer_range": 0.1,
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"intermediate_size": 6144,
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"head_dim": 128,
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"max_position_embeddings": 32768,
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"model_type": "llama",
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"num_attention_heads": 16,
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"num_hidden_layers": 28,
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"num_key_value_heads": 2,
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"rms_norm_eps": 1e-06,
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"rope_scaling": {
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"factor": 1.0,
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"rope_type": "longrope",
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"long_factor": [0.9977997200264581, 1.014658295992452, 1.0349680404997148, 1.059429246056193, 1.0888815016813513, 1.1243301355211495, 1.166977103606075, 1.2182568066927284, 1.2798772354275727, 1.3538666751582975, 1.4426259039919596, 1.5489853358570191, 1.6762658237220625, 1.8283407612492941, 2.0096956085876183, 2.225478927469756, 2.481536379650452, 2.784415934557119, 3.1413289096347365, 3.560047844772632, 4.048719380066383, 4.615569542115128, 5.2684819496549835, 6.014438591970396, 6.858830049237097, 7.804668263503327, 8.851768731513417, 9.99600492938444, 11.228766118181639, 12.536757560834843, 13.902257701387796, 15.303885189125953, 16.717837610115794, 18.119465097853947, 19.484965238406907, 20.792956681060105, 22.02571786985731, 23.16995406772833, 24.217054535738416, 25.16289275000465, 26.007284207271347, 26.753240849586767, 27.40615325712662, 27.973003419175363, 28.461674954469114, 28.880393889607006, 29.237306864684626, 29.540186419591297, 29.79624387177199, 30.01202719065413, 30.193382037992453, 30.34545697551969, 30.47273746338473, 30.579096895249787, 30.66785612408345, 30.741845563814174, 30.80346599254902, 30.85474569563567, 30.897392663720595, 30.932841297560394, 30.962293553185553, 30.986754758742034, 31.007064503249293, 31.02392307921529],
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"short_factor": [0.9977997200264581, 1.014658295992452, 1.0349680404997148, 1.059429246056193, 1.0888815016813513, 1.1243301355211495, 1.166977103606075, 1.2182568066927284, 1.2798772354275727, 1.3538666751582975, 1.4426259039919596, 1.5489853358570191, 1.6762658237220625, 1.8283407612492941, 2.0096956085876183, 2.225478927469756, 2.481536379650452, 2.784415934557119, 3.1413289096347365, 3.560047844772632, 4.048719380066383, 4.615569542115128, 5.2684819496549835, 6.014438591970396, 6.858830049237097, 7.804668263503327, 8.851768731513417, 9.99600492938444, 11.228766118181639, 12.536757560834843, 13.902257701387796, 15.303885189125953, 16.717837610115794, 18.119465097853947, 19.484965238406907, 20.792956681060105, 22.02571786985731, 23.16995406772833, 24.217054535738416, 25.16289275000465, 26.007284207271347, 26.753240849586767, 27.40615325712662, 27.973003419175363, 28.461674954469114, 28.880393889607006, 29.237306864684626, 29.540186419591297, 29.79624387177199, 30.01202719065413, 30.193382037992453, 30.34545697551969, 30.47273746338473, 30.579096895249787, 30.66785612408345, 30.741845563814174, 30.80346599254902, 30.85474569563567, 30.897392663720595, 30.932841297560394, 30.962293553185553, 30.986754758742034, 31.007064503249293, 31.02392307921529],
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"original_max_position_embeddings": 32768
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},
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"torch_dtype": "bfloat16",
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"transformers_version": "4.36.0",
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"use_cache": true,
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"vocab_size": 73448
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}
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{
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"do_sample": true,
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"top_p": 0.8,
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"temperature": 0.8,
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"bos_token_id": 1,
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"eos_token_id": [2,73440],
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"pad_token_id": 2
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}
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pytorch_model.bin
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@@ -0,0 +1,3 @@
|
|||||||
|
version https://git-lfs.github.com/spec/v1
|
||||||
|
oid sha256:925de9a99621f935f72361d34f9ab77f906f07c9362564e0aaba8fa8202d730b
|
||||||
|
size 3244413702
|
||||||
81
special_tokens_map.json
Normal file
81
special_tokens_map.json
Normal file
@@ -0,0 +1,81 @@
|
|||||||
|
{
|
||||||
|
"additional_special_tokens": [
|
||||||
|
{
|
||||||
|
"content": "<|im_end|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"content": "<|im_start|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"content": "<|tool_call|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"content": "<|execute_start|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"content": "<|execute_end|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"content": "<|fim_prefix|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"content": "<|fim_middle|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"content": "<|fim_suffix|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
}
|
||||||
|
],
|
||||||
|
"bos_token": {
|
||||||
|
"content": "<s>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
"eos_token": {
|
||||||
|
"content": "</s>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
},
|
||||||
|
"unk_token": {
|
||||||
|
"content": "<unk>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false
|
||||||
|
}
|
||||||
|
}
|
||||||
177952
tokenizer.json
Normal file
177952
tokenizer.json
Normal file
File diff suppressed because it is too large
Load Diff
3
tokenizer.model
Normal file
3
tokenizer.model
Normal file
@@ -0,0 +1,3 @@
|
|||||||
|
version https://git-lfs.github.com/spec/v1
|
||||||
|
oid sha256:bb74d51116831c3bf65db812c553f94ab0c88dcf97a5bbb37e3504f6d359c530
|
||||||
|
size 1181204
|
||||||
116
tokenizer_config.json
Normal file
116
tokenizer_config.json
Normal file
@@ -0,0 +1,116 @@
|
|||||||
|
{
|
||||||
|
"add_bos_token": true,
|
||||||
|
"add_eos_token": false,
|
||||||
|
"added_tokens_decoder": {
|
||||||
|
"0": {
|
||||||
|
"content": "<unk>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"1": {
|
||||||
|
"content": "<s>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"2": {
|
||||||
|
"content": "</s>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73440": {
|
||||||
|
"content": "<|im_end|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73441": {
|
||||||
|
"content": "<|im_start|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73442": {
|
||||||
|
"content": "<|tool_call|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73443": {
|
||||||
|
"content": "<|execute_start|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73444": {
|
||||||
|
"content": "<|execute_end|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73445": {
|
||||||
|
"content": "<|fim_prefix|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73446": {
|
||||||
|
"content": "<|fim_middle|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
},
|
||||||
|
"73447": {
|
||||||
|
"content": "<|fim_suffix|>",
|
||||||
|
"lstrip": false,
|
||||||
|
"normalized": false,
|
||||||
|
"rstrip": false,
|
||||||
|
"single_word": false,
|
||||||
|
"special": true
|
||||||
|
}
|
||||||
|
},
|
||||||
|
"additional_special_tokens": [
|
||||||
|
"<|im_end|>",
|
||||||
|
"<|im_start|>",
|
||||||
|
"<|tool_call|>",
|
||||||
|
"<|execute_start|>",
|
||||||
|
"<|execute_end|>",
|
||||||
|
"<|fim_prefix|>",
|
||||||
|
"<|fim_middle|>",
|
||||||
|
"<|fim_suffix|>"
|
||||||
|
],
|
||||||
|
"bos_token": "<s>",
|
||||||
|
"clean_up_tokenization_spaces": false,
|
||||||
|
"eos_token": "<|im_end|>",
|
||||||
|
"legacy": true,
|
||||||
|
"model_max_length": 1000000000000000019884624838656,
|
||||||
|
"pad_token": null,
|
||||||
|
"sp_model_kwargs": {},
|
||||||
|
"spaces_between_special_tokens": false,
|
||||||
|
"tokenizer_class": "LlamaTokenizer",
|
||||||
|
"unk_token": "<unk>",
|
||||||
|
"use_default_system_prompt": false,
|
||||||
|
"chat_template": "{% for message in messages %}{{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n'}}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}"
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user