Add README with dataset documentation

README.md

@@ -42,12 +42,52 @@ Each record contains:
 <!-- SPLIT-SECTION:train:START -->
 ## Split: train
 
-- Total Questions: 5816
-- Unique Videos: 207
-- Unique Questions: 518
-- Yes Answers: 2908 (50.0%)
-- No Answers: 2908 (50.0%)
-- Balance Ratio: 1.0
-- Total Size: 5073.39 MB (4.95 GB)
-- Average Video Size: 24.51 MB
+### Statistics
+
+- **Total Questions**: 5816
+- **Unique Videos**: 207
+- **Unique Questions**: 518
+- **Yes Answers**: 2908 (50.0%)
+- **No Answers**: 2908 (50.0%)
+- **Balance Ratio**: 1.0
+- **Total Size**: 5073.39 MB (4.95 GB)
+- **Average Video Size**: 24.51 MB
+
+
+### Format: WebDataset
+
+This split uses WebDataset format for efficient streaming:
+- **Tar Shards**: 16 tar files
+- **Path**: `webdataset/train/train-*.tar`
+- **Structure**: Each tar contains frames, optical flows, and metadata in WebDataset format
+- **Usage**: Load with `webdataset` library for streaming access
+
+```python
+import webdataset as wds
+
+dataset = wds.WebDataset("path/to/train-*.tar").decode("rgb")
+for sample in dataset:
+    video_name = sample["video_name"]
+    frames = [sample[f"frame_{i:04d}.png"] for i in range(sample["num_frames"])]
+    flows = [sample[f"flow_{i:04d}.png"] for i in range(sample["num_flows"])]
+    # ...process sample...
+```
+
 <!-- SPLIT-SECTION:train:END -->
+
+
+
+
+
+<!-- SPLIT-SECTION:test:START -->
+## Split: test
+
+- Total Questions: 249
+- Unique Videos: 70
+- Unique Questions: 13
+- Yes Answers: 89 (35.7%)
+- No Answers: 160 (64.3%)
+- Balance Ratio: 0.55625
+- Total Size: 258.40 MB (0.25 GB)
+- Average Video Size: 3.69 MB
+<!-- SPLIT-SECTION:test:END -->