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Model: ambrosfitz/smollm2-graphcot Source: Original Platform
2026-09-04 14:58:18 +08:00
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--- a/README.md
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+---
+license: apache-2.0
+base_model: HuggingFaceTB/SmolLM2-360M
+datasets:
+- ambrosfitz/Wikipedia_GraphCoT_Summarization
+language:
+- en
+tags:
+- text-generation
+- summarization
+- chain-of-thought
+- graph-reasoning
+- fine-tuned
+pipeline_tag: text-generation
+---
+
+# SmolLM2-360M — GraphCoT Fine-tune
+
+Fine-tuned version of [SmolLM2-360M](https://huggingface.co/HuggingFaceTB/SmolLM2-360M) on the [Wikipedia GraphCoT Summarization](https://huggingface.co/datasets/ambrosfitz/Wikipedia_GraphCoT_Summarization) dataset.
+
+The model learns to perform **semantic graph chain-of-thought (GraphCoT) summarization**: given a raw paragraph, it explicitly constructs a semantic knowledge graph before writing a summary grounded exclusively in that graph. No fact in the summary can appear unless it exists as an edge.
+
+---
+
+## What it does
+
+Given a paragraph wrapped in `<input>` tags, the model generates a structured `<reasoning>` block followed by a `<summary>`:
+
+1. **Content words** — extracts key nouns, verbs, and proper entities
+2. **Coreference** — resolves pronouns and aliases to a single primary subject
+3. **Relations** — builds `(subject, relation, object)` triples in snake_case
+4. **Graph** — organises triples into a rooted ASCII tree
+5. **Summary** — writes 1–3 sentences where every clause maps to a graph edge
+
+---
+
+## Example output
+
+**Input:**
+```
+Alan Turing was a British mathematician and computer scientist who played a
+crucial role in breaking German ciphers during World War II. He is widely
+regarded as the father of theoretical computer science and artificial intelligence.
+```
+
+**Model output:**
+```
+<reasoning>
+<content_words>
+  nouns: mathematician, computer, scientist, role, cipher, father, theory, intelligence
+  verbs: break, regard
+  proper_entities: Alan Turing, British, World War II, German
+</content_words>
+
+<coref>
+  (none)
+</coref>
+
+<relations>
+  (Alan Turing, is_a, British mathematician)
+  (Alan Turing, is_a, computer scientist)
+  (Alan Turing, broke, German ciphers)
+  (Alan Turing, broke_during, World War II)
+  (Alan Turing, is_the_father_of, theoretical computer science)
+  (Alan Turing, is_the_father_of, artificial intelligence)
+</relations>
+
+<graph>
+ROOT: Alan Turing
+├─ is_a -> British mathematician
+├─ is_a -> computer scientist
+├─ broke -> German ciphers
+│  └─ broke_during -> World War II
+├─ is_the_father_of -> theoretical computer science
+└─ is_the_father_of -> artificial intelligence
+</graph>
+</reasoning>
+
+<summary>
+Alan Turing was a British mathematician and computer scientist who broke German
+ciphers during World War II. He is regarded as the father of theoretical computer
+science and artificial intelligence.
+</summary>
+```
+
+---
+
+## Usage
+
+```python
+from transformers import AutoTokenizer, AutoModelForCausalLM
+import torch
+
+model_id = "ambrosfitz/smollm2-graphcot"
+tokenizer = AutoTokenizer.from_pretrained(model_id)
+model = AutoModelForCausalLM.from_pretrained(model_id, torch_dtype=torch.float16, device_map="auto")
+
+paragraph = "Your paragraph here."
+prompt = f"<input>\n{paragraph}\n</input>\n\n<reasoning>\n"
+
+inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
+with torch.no_grad():
+    output_ids = model.generate(
+        **inputs,
+        max_new_tokens=400,
+        do_sample=False,
+        repetition_penalty=1.1,
+    )
+
+print(tokenizer.decode(output_ids[0][inputs["input_ids"].shape[1]:], skip_special_tokens=True))
+```
+
+---
+
+## Training
+
+### Dataset
+[ambrosfitz/Wikipedia_GraphCoT_Summarization](https://huggingface.co/datasets/ambrosfitz/Wikipedia_GraphCoT_Summarization) — 6,856 Wikipedia paragraphs processed through a two-stage pipeline:
+
+- **Stage 1 (local):** spaCy scaffold — content word extraction, dependency triples, coreference clustering
+- **Stage 2 (LLM):** Gemini 2.5 Flash normalization — semantic edge labelling, tree assembly, grounded summary generation
+
+| Split | Records |
+|-------|---------|
+| Train | 6,172 |
+| Validation | 342 |
+| Test | 342 |
+
+### Loss masking
+Only `<reasoning>` and `<summary>` tokens contribute to the loss. The `<input>` paragraph is masked (`label = -100`) so the model learns to *generate* the graph and summary, not memorise the input.
+
+### Hyperparameters
+
+| Parameter | Value |
+|-----------|-------|
+| Base model | HuggingFaceTB/SmolLM2-360M |
+| Epochs | 3 |
+| Effective batch size | 16 (8 × 2 grad accum) |
+| Learning rate | 2e-5 |
+| LR schedule | Cosine with 100 warmup steps |
+| Max sequence length | 1024 tokens |
+| Precision | fp16 (AMP) |
+| Gradient checkpointing | Yes |
+| Hardware | NVIDIA T4 (Google Colab) |
+| Training time | ~2h 18m |
+
+### Training curves
+
+| Step | Train Loss | Eval Loss |
+|------|-----------|-----------|
+| 100  | 0.520 | 0.497 |
+| 300  | 0.369 | 0.367 |
+| 500  | 0.315 | 0.335 |
+| 700  | 0.310 | 0.320 |
+| 900  | 0.260 | 0.314 |
+| 1100 | 0.278 | 0.312 |
+| 1158 | 0.282 | 0.312 |
+
+Train and validation loss stayed within ~0.03 throughout — no overfitting.
+
+---
+
+## Limitations
+
+- Trained on Wikipedia-style encyclopaedic paragraphs; may produce lower-quality graphs on conversational or highly technical text
+- 360M parameters — graph structure may be incomplete or inconsistent on long or complex inputs
+- Max context 1024 tokens; paragraphs longer than ~700 words will be truncated
--- a/config.json
+++ b/config.json
@@ -0,0 +1,34 @@
+{
+  "architectures": [
+    "LlamaForCausalLM"
+  ],
+  "attention_bias": false,
+  "attention_dropout": 0.0,
+  "bos_token_id": 0,
+  "dtype": "float32",
+  "eos_token_id": 0,
+  "head_dim": 64,
+  "hidden_act": "silu",
+  "hidden_size": 960,
+  "initializer_range": 0.02,
+  "intermediate_size": 2560,
+  "is_llama_config": true,
+  "max_position_embeddings": 8192,
+  "mlp_bias": false,
+  "model_type": "llama",
+  "num_attention_heads": 15,
+  "num_hidden_layers": 32,
+  "num_key_value_heads": 5,
+  "pad_token_id": 0,
+  "pretraining_tp": 1,
+  "rms_norm_eps": 1e-05,
+  "rope_interleaved": false,
+  "rope_parameters": {
+    "rope_theta": 100000,
+    "rope_type": "default"
+  },
+  "tie_word_embeddings": true,
+  "transformers_version": "5.12.0",
+  "use_cache": false,
+  "vocab_size": 49152
+}
--- a/generation_config.json
+++ b/generation_config.json
@@ -0,0 +1,9 @@
+{
+  "_from_model_config": true,
+  "bos_token_id": 0,
+  "eos_token_id": [
+    0
+  ],
+  "pad_token_id": 0,
+  "transformers_version": "5.12.0"
+}
--- a/model.safetensors
+++ b/model.safetensors
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+size 1447317080
--- a/tokenizer.json
+++ b/tokenizer.json
--- a/tokenizer_config.json
+++ b/tokenizer_config.json
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+{
+  "add_prefix_space": false,
+  "backend": "tokenizers",
+  "bos_token": "<|endoftext|>",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "<|endoftext|>",
+  "errors": "replace",
+  "extra_special_tokens": [
+    "<|endoftext|>",
+    "<|im_start|>",
+    "<|im_end|>",
+    "<repo_name>",
+    "<reponame>",
+    "<file_sep>",
+    "<filename>",
+    "<gh_stars>",
+    "<issue_start>",
+    "<issue_comment>",
+    "<issue_closed>",
+    "<jupyter_start>",
+    "<jupyter_text>",
+    "<jupyter_code>",
+    "<jupyter_output>",
+    "<jupyter_script>",
+    "<empty_output>"
+  ],
+  "is_local": false,
+  "local_files_only": false,
+  "model_max_length": 8192,
+  "pad_token": "<|endoftext|>",
+  "tokenizer_class": "GPT2Tokenizer",
+  "unk_token": "<|endoftext|>",
+  "vocab_size": 49152
+}