Add difficulty column via opencode (unsloth/OpenMathReasoning-mini)

README.md

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+---
+dataset_info:
+  features:
+  - name: expected_answer
+    dtype: string
+  - name: problem_type
+    dtype: string
+  - name: problem_source
+    dtype: string
+  - name: generation_model
+    dtype: string
+  - name: pass_rate_72b_tir
+    dtype: string
+  - name: problem
+    dtype: string
+  - name: generated_solution
+    dtype: string
+  - name: inference_mode
+    dtype: string
+  - name: difficulty
+    dtype: string
+  splits:
+  - name: cot
+    num_bytes: 232826890
+    num_examples: 19252
+  download_size: 104629909
+  dataset_size: 232826890
+configs:
+- config_name: default
+  data_files:
+  - split: cot
+    path: data/cot-*
+---

data/cot-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:615588c4c2e7ed049b540a8f740380ce159ee8e66df4cefe5418021e5235a901
+size 104629909