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Model: juanquivilla/sotto-cleanup-lfm25-350m
Source: Original Platform

.gitattributes

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README.md

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+---
+license: mit
+language:
+- en
+base_model: LiquidAI/LFM2.5-350M-Base
+tags:
+- speech-to-text
+- transcript-cleanup
+- text-correction
+- asr-post-processing
+- LFM
+- LiquidAI
+- grpo
+- full-fine-tune
+- inverse-text-normalization
+pipeline_tag: text-generation
+datasets:
+- juanquivilla/sotto-transcript-cleanup
+---
+
+# SottoASR Transcript Cleanup — LFM2.5-350M (Full Precision, soup_30)
+
+[sottoasr.app](https://sottoasr.app) · [MLX 5-bit (recommended)](https://huggingface.co/juanquivilla/sotto-cleanup-lfm25-350m-mlx-5bit) · [MLX 4-bit (smaller)](https://huggingface.co/juanquivilla/sotto-cleanup-lfm25-350m-mlx-4bit) · [Training Dataset](https://huggingface.co/datasets/juanquivilla/sotto-transcript-cleanup)
+
+## Overview
+
+Full-precision bf16 fine-tune of [LiquidAI/LFM2.5-350M-Base](https://huggingface.co/LiquidAI/LFM2.5-350M-Base) for on-device speech-to-text transcript cleanup. This is the **training artifact** — for on-device deployment on Apple Silicon, use the [5-bit MLX variant](https://huggingface.co/juanquivilla/sotto-cleanup-lfm25-350m-mlx-5bit).
+
+## What's new (model soup release)
+
+This model is a **weight-space average** of two strong checkpoints from the same fine-tuning lineage:
+- **0.3 × v55** (latest: 2-epoch refinement at lr 2e-6) — strongest on number-accuracy and filler-stripping
+- **0.7 × v51** (the prior production model) — strongest on adversarial sampling benchmark
+
+Linear interpolation in weight space (`θ = α·θ_v55 + (1-α)·θ_v51`) is sometimes called "model souping". It works here because v55 was chained from v51 (same architecture, related minima), and the soup recovers v51's bench-sample strengths without losing v55's number/filler gains. The full recipe sweep is in the [research journal](https://github.com/anthropics) (2026-05-06 loop).
+
+## Headline numbers (production-mode eval: `max_new_tokens=900`, `repetition_penalty=1.05`)
+
+| Capability | v36 | v45 | v51 | v55 | **soup (this)** |
+|---|---:|---:|---:|---:|---:|
+| Number accuracy (171-sample stratified val) | 12.9% | 95.9% | 95.3% | 96.5% | **96.5%** |
+| 66-case adversarial benchmark (greedy) | n/a | 76% | 84.8% | 84.8% | **86.4%** |
+| 66-case adversarial benchmark (temp 0.7 × 4) | n/a | 77% | 84.5% | 82.6% | **86.0%** |
+| Loops on 264 sampling-mode probes | n/a | 0 | 1 | 2 | **0** |
+| Filler-free on 241 long inputs | 67.2% | 68.0% | 72.2% | 72.6% | 71.8% |
+| Sub-deletion >15% on 241 long inputs | 13.3% | 13.7% | 4.6% | 5.0% | **5.0%** |
+
+Composite score (0.35×num + 0.30×bench_greedy + 0.15×bench_sample + 0.10×filler_long + 0.05×(1-sub15) + 0.05×(1-loops/N)): **89.51** at full production settings.
+
+## Training pipeline
+
+```
+LiquidAI/LFM2.5-350M-Base
+  → SFT v23 → GRPO v23 (paragraph emission)
+  → GRPO v36: full FT with substantive-deletion-aware reward
+  → SFT v39: + 12.7K augmented number examples (ITN)
+  → GRPO v40–v45: chained refinement, fixed reward + amplified filler penalty
+  → GRPO v50 + v51: anti-loop n-gram penalty
+  → GRPO v55: 2-epoch refinement at lr 2e-6 (best chained checkpoint)
+  → soup: 0.3·θ_v55 + 0.7·θ_v51 (weight-space average — this model)
+```
+
+## Usage
+
+```python
+from transformers import AutoModelForCausalLM, AutoTokenizer
+import torch
+
+model = AutoModelForCausalLM.from_pretrained(
+    "juanquivilla/sotto-cleanup-lfm25-350m",
+    dtype=torch.bfloat16, trust_remote_code=True,
+)
+tokenizer = AutoTokenizer.from_pretrained("juanquivilla/sotto-cleanup-lfm25-350m")
+
+text = "talk about server three sixty"
+prompt = f"### Input:\n{text}\n\n### Output:\n"
+
+inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
+with torch.no_grad():
+    out = model.generate(
+        **inputs,
+        max_new_tokens=max(900, int(len(text.split()) * 1.5)),  # ≥1.5× input word count
+        do_sample=False,
+        repetition_penalty=1.05,                                # LFM2.5 official default
+    )
+output = tokenizer.decode(out[0][inputs["input_ids"].shape[1]:], skip_special_tokens=True)
+if "###" in output:
+    output = output[:output.index("###")]
+print(output.strip())
+```
+
+### Inference recommendations
+
+The headline numbers above use these settings — they match the LFM2.5 model card's defaults and are the production deployment for [sottoasr.app](https://sottoasr.app):
+
+- **`repetition_penalty=1.05`** — LFM2.5's official default. Critical for long inputs: prevents the rare voicemail-style 5-gram loops that can occur with `repetition_penalty=1.0`.
+- **`max_new_tokens >= 1.5 × input_word_count`** (or 900 minimum) — long inputs (>200 words) need headroom; truncating mid-output looks like content deletion.
+- **`do_sample=False`** (greedy) for deterministic output. If sampling is needed, use `temperature=0.1, top_k=50`.
+
+## All Variants
+
+| Variant | Size | Use Case |
+|---------|------|----------|
+| **[Full precision (this)](https://huggingface.co/juanquivilla/sotto-cleanup-lfm25-350m)** | 676 MB | Training, GPU inference |
+| **[MLX 5-bit](https://huggingface.co/juanquivilla/sotto-cleanup-lfm25-350m-mlx-5bit)** | ~237 MB | **Recommended for Apple Silicon** |
+| [MLX 4-bit](https://huggingface.co/juanquivilla/sotto-cleanup-lfm25-350m-mlx-4bit) | ~195 MB | Smallest |
+
+## License
+
+MIT

chat_template.jinja

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+{{- bos_token -}}{%- set system_prompt = "" -%}{%- set ns = namespace(system_prompt="") -%}{%- if messages[0]["role"] == "system" -%} {%- set ns.system_prompt = messages[0]["content"] -%} {%- set messages = messages[1:] -%}{%- endif -%}{%- if tools -%} {%- set ns.system_prompt = ns.system_prompt + ("
+" if ns.system_prompt else "") + "List of tools: <|tool_list_start|>[" -%} {%- for tool in tools -%} {%- if tool is not string -%} {%- set tool = tool | tojson -%} {%- endif -%} {%- set ns.system_prompt = ns.system_prompt + tool -%} {%- if not loop.last -%} {%- set ns.system_prompt = ns.system_prompt + ", " -%} {%- endif -%} {%- endfor -%} {%- set ns.system_prompt = ns.system_prompt + "]<|tool_list_end|>" -%}{%- endif -%}{%- if ns.system_prompt -%} {{- "<|im_start|>system
+" + ns.system_prompt + "<|im_end|>
+" -}}{%- endif -%}{%- for message in messages -%} {{- "<|im_start|>" + message["role"] + "
+" -}} {%- set content = message["content"] -%} {%- if content is not string -%} {%- set content = content | tojson -%} {%- endif -%} {%- if message["role"] == "tool" -%} {%- set content = "<|tool_response_start|>" + content + "<|tool_response_end|>" -%} {%- endif -%} {{- content + "<|im_end|>
+" -}}{%- endfor -%}{%- if add_generation_prompt -%} {{- "<|im_start|>assistant
+" -}}{%- endif -%}

config.json

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+{
+  "architectures": [
+    "Lfm2ForCausalLM"
+  ],
+  "block_auto_adjust_ff_dim": true,
+  "block_dim": 1024,
+  "block_ff_dim": 6656,
+  "block_ffn_dim_multiplier": 1.0,
+  "block_mlp_init_scale": 1.0,
+  "block_multiple_of": 256,
+  "block_norm_eps": 1e-05,
+  "block_out_init_scale": 1.0,
+  "block_use_swiglu": true,
+  "block_use_xavier_init": true,
+  "bos_token_id": 1,
+  "conv_L_cache": 3,
+  "conv_bias": false,
+  "conv_dim": 1024,
+  "conv_use_xavier_init": true,
+  "dtype": "bfloat16",
+  "eos_token_id": 7,
+  "hidden_size": 1024,
+  "initializer_range": 0.02,
+  "intermediate_size": 6656,
+  "layer_types": [
+    "conv",
+    "conv",
+    "full_attention",
+    "conv",
+    "conv",
+    "full_attention",
+    "conv",
+    "conv",
+    "full_attention",
+    "conv",
+    "full_attention",
+    "conv",
+    "full_attention",
+    "conv",
+    "full_attention",
+    "conv"
+  ],
+  "max_position_embeddings": 128000,
+  "model_type": "lfm2",
+  "norm_eps": 1e-05,
+  "num_attention_heads": 16,
+  "num_heads": 16,
+  "num_hidden_layers": 16,
+  "num_key_value_heads": 8,
+  "pad_token_id": 0,
+  "rope_parameters": {
+    "rope_theta": 1000000.0,
+    "rope_type": "default"
+  },
+  "tie_word_embeddings": true,
+  "transformers_version": "5.3.0",
+  "use_cache": false,
+  "use_pos_enc": true,
+  "vocab_size": 65536,
+  "rope_theta": 1000000.0
+}

generation_config.json

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+{
+  "_from_model_config": true,
+  "bos_token_id": 1,
+  "eos_token_id": [
+    7
+  ],
+  "pad_token_id": 0,
+  "transformers_version": "5.3.0"
+}

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tokenizer_config.json

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+{
+  "backend": "tokenizers",
+  "bos_token": "<|startoftext|>",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "<|im_end|>",
+  "extra_special_tokens": [],
+  "is_local": true,
+  "legacy": false,
+  "local_files_only": false,
+  "model_input_names": [
+    "input_ids",
+    "attention_mask"
+  ],
+  "model_max_length": 1000000000000000019884624838656,
+  "pad_token": "<|pad|>",
+  "sp_model_kwargs": {},
+  "spaces_between_special_tokens": false,
+  "tokenizer_class": "TokenizersBackend",
+  "use_default_system_prompt": false,
+  "use_fast": true
+}

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