Create deterministic nested 50-candidate LastFM dataset

README.md

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+---
+dataset_info:
+  features:
+  - name: historyList
+    dtype: string
+  - name: itemList
+    sequence: string
+  - name: trueSelection
+    dtype: string
+  - name: fixed_prompt
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 90844554
+    num_examples: 47872
+  - name: validation
+    num_bytes: 5198644
+    num_examples: 2767
+  - name: test
+    num_bytes: 4691993
+    num_examples: 2495
+  download_size: 37907657
+  dataset_size: 100735191
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+  - split: validation
+    path: data/validation-*
+  - split: test
+    path: data/test-*
+---

data/test-00000-of-00001.parquet

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+size 1799182

data/train-00000-of-00001.parquet

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+size 34132302

data/validation-00000-of-00001.parquet

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+size 1976173