Convert dataset to Parquet

Convert dataset to Parquet.

README.md

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+---
+dataset_info:
+  features:
+  - name: Problem
+    dtype: string
+  - name: Rationale
+    dtype: string
+  - name: options
+    dtype: string
+  - name: correct
+    dtype: string
+  - name: annotated_formula
+    dtype: string
+  - name: linear_formula
+    dtype: string
+  - name: category
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 18338902
+    num_examples: 29837
+  - name: test
+    num_bytes: 1841164
+    num_examples: 2985
+  - name: validation
+    num_bytes: 2748461
+    num_examples: 4475
+  download_size: 11202563
+  dataset_size: 22928527
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+  - split: test
+    path: data/test-*
+  - split: validation
+    path: data/validation-*
+---

data/test-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:f4b3aa74f6f1c40ea772957900a696eeed83688b7b62259f7182c0b52644ff15
+size 898634

data/train-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:63da98c21d12f3f60a990e566d5563255f093d59e0c358ac316134269a3f386d
+size 8961148

data/validation-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d9ef106f2db00e048e376e13f7363c384648f68d514d033279ac839e0cf397cd
+size 1342781