Add model card for checkpoint 4

README.md

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-license: apache-2.0
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+# DeepSeek R1 Checkpoint 4
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+This is checkpoint 4 from training the DeepSeek R1 model on mathematical reasoning tasks using GRPO.
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+- **Model**: deepseek-ai/deepseek-r1-distill-qwen-7b
+- **Checkpoint Step**: 4
+- **Training Details**: Trained on 8 NVIDIA B200 GPUs with batch size 6 per GPU, 6 epochs.