Convert dataset to Parquet

Convert dataset to Parquet.

README.md

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+---
+dataset_info:
+  config_name: linear_example
+  features:
+  - name: equation
+    dtype: string
+  - name: vars
+    sequence: int64
+  - name: output
+    dtype: int64
+  splits:
+  - name: train
+    num_bytes: 3400
+    num_examples: 100
+  - name: test
+    num_bytes: 3400
+    num_examples: 100
+  download_size: 5445
+  dataset_size: 6800
+configs:
+- config_name: linear_example
+  data_files:
+  - split: train
+    path: linear_example/train-*
+  - split: test
+    path: linear_example/test-*
+---

linear_example/test-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:e6732ea6ba73f9a3255d31a5d52217e0f0069fc0b6684c5658ba6a010e5d5330
+size 2722

linear_example/train-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1be49e8358c77237a5256ced4cdd0e40dfd36488a9711316ec056487206bba25
+size 2723