Convert dataset to Parquet

Convert dataset to Parquet.

README.md

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+---
+dataset_info:
+  config_name: cnn-dm
+  features:
+  - name: article
+    dtype: string
+  - name: summary
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 2008766
+    num_examples: 2134
+  - name: test
+    num_bytes: 34190676
+    num_examples: 11490
+  - name: validation
+    num_bytes: 39904959
+    num_examples: 13368
+  download_size: 46767153
+  dataset_size: 76104401
+configs:
+- config_name: cnn-dm
+  data_files:
+  - split: train
+    path: cnn-dm/train-*
+  - split: test
+    path: cnn-dm/test-*
+  - split: validation
+    path: cnn-dm/validation-*
+---

cnn-dm/test-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:b23187b72b6fbc8e65524b4a29535b4a0f91a55a34635760dfc071a582474bda
+size 21013668

cnn-dm/train-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:23d57908e7d2e02e491a7bdd90716a07e787686f2a9f659e124cc61ca68ec343
+size 1261284

cnn-dm/validation-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:f20a1722d9bf9ad91a6208898d57edfd12b998dbc6b8a11b3b1e081de5781f8e
+size 24492201