Convert dataset to Parquet

Convert dataset to Parquet.

BillSum/test-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:4dc083049f804509b3a2cd77cb2bcb8455a3fd7422713a45f73e29aa0ac81a96
+size 13914759

BillSum/train-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:ffd2fc816f84fea4820acc66f124e3a459406ed70b43bd77fbaa0deee7792894
+size 80998581

README.md

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+---
+dataset_info:
+  config_name: BillSum
+  features:
+  - name: article
+    dtype: string
+  - name: summary
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 181918689
+    num_examples: 18949
+  - name: test
+    num_bytes: 31298716
+    num_examples: 3269
+  download_size: 94913340
+  dataset_size: 213217405
+configs:
+- config_name: BillSum
+  data_files:
+  - split: train
+    path: BillSum/train-*
+  - split: test
+    path: BillSum/test-*
+---