Convert dataset to Parquet

Convert dataset to Parquet.

README.md

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+---
+dataset_info:
+  config_name: n_books_1000-extractions_per_book_1-prefix_length_125
+  features:
+  - name: prefix
+    dtype: string
+  - name: book
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 10184644
+    num_examples: 979
+  download_size: 6341298
+  dataset_size: 10184644
+configs:
+- config_name: n_books_1000-extractions_per_book_1-prefix_length_125
+  data_files:
+  - split: train
+    path: n_books_1000-extractions_per_book_1-prefix_length_125/train-*
+---

n_books_1000-extractions_per_book_1-prefix_length_125/train-00000-of-00001.parquet

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:471f0d61e14712d2af5bd69b8e119a1342365495372aca06f4a5752aabc272c4
+size 6341298