Update README.md

README.md

@@ -9,6 +9,7 @@ tags:
 - reward model
 - math
 - hallucination-detection
+license: apache-2.0
 base_model:
 - Qwen/Qwen2.5-Math-1.5B-Instruct
 datasets:
@@ -120,3 +121,25 @@ token_masks = input_ids == step_sep_id
 step_reward = make_step_rewards(outputs[0], token_masks)
 print(step_reward)  # one score per step
 ```
+
+## Source Model and Attribution
+
+This checkpoint is a fine-tuned derivative of
+[Qwen/Qwen2.5-Math-1.5B-Instruct](https://huggingface.co/Qwen/Qwen2.5-Math-1.5B-Instruct),
+released under the [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0) license.
+The weights were modified: the language modelling head was replaced with a two-way
+process reward head, and the model was further trained on span-derived step-level
+supervision.
+
+Training data comes from the [SHARP](https://huggingface.co/datasets/ZaandaTeika/SHARP)
+corpus, whose reasoning traces and hallucination annotations are licensed under
+CC BY 4.0. SHARP builds on GSM8K and MATH (both MIT); see the dataset card for the
+full source attribution.
+
+## Additional Information
+
+### Licensing Information
+
+This checkpoint is released under the
+[Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0) license, following its
+base model.