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: 52924
+  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:dbb07d67bda7ed4fd0fc55298d42df0bac76f5d9768380da44fc4c1d3b0ffe1e
+size 41140

et/validation-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:526b66b626699f923125b3ac76b6082e3db54f326786cf98d29cf2f6f6405f40
+size 11784