Add balanced Twitter ads dataset (1k normal + 3k ads)

README.md

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+---
+dataset_info:
+  features:
+  - name: text
+    dtype: string
+  - name: label
+    dtype: int64
+  - name: tweet_id
+    dtype: string
+  - name: screen_name
+    dtype: string
+  - name: confidence_score
+    dtype: float64
+  - name: source
+    dtype: string
+  - name: created_at
+    dtype: string
+  - name: label_name
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 544554
+    num_examples: 1798
+  - name: validation
+    num_bytes: 57722
+    num_examples: 199
+  download_size: 374014
+  dataset_size: 602276
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+  - split: validation
+    path: data/validation-*
+---

data/train-00000-of-00001.parquet

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+size 333011

data/validation-00000-of-00001.parquet

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+size 41003