Convert dataset to Parquet

Convert dataset to Parquet.

README.md

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+---
+dataset_info:
+  config_name: et
+  features:
+  - name: premise
+    dtype: string
+  - name: choice1
+    dtype: string
+  - name: choice2
+    dtype: string
+  - name: question
+    dtype: string
+  - name: label
+    dtype: int32
+  - name: idx
+    dtype: int32
+  - name: changed
+    dtype: bool
+  splits:
+  - name: validation
+    num_bytes: 11669
+    num_examples: 100
+  - name: test
+    num_bytes: 56471
+    num_examples: 500
+  download_size: 52775
+  dataset_size: 68140
+configs:
+- config_name: et
+  data_files:
+  - split: validation
+    path: et/validation-*
+  - split: test
+    path: et/test-*
+---

et/test-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:6eadba625c9ca58528533b0f6dd08e60a3f955d3503ee3f8ff67a9545fd58c66
+size 41064

et/validation-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:3c3d40e0d4d833bf796f4fc27a987e757e57cf1b9782978490970cad4dbd30e5
+size 11711