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README.md
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@@ -229,6 +229,346 @@ for video_path in train_df['path'][:5]:
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f"label {seg['label']}")
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```
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| 232 |
## Technical Properties
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| 233 |
|
| 234 |
### Video Specifications
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| 229 |
f"label {seg['label']}")
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```
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| 231 |
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| 232 |
+
### PyTorch Dataset Integration
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| 233 |
+
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| 234 |
+
```python
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| 235 |
+
from datasets import load_dataset
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| 236 |
+
import pandas as pd
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| 237 |
+
import torch
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| 238 |
+
from torch.utils.data import Dataset, DataLoader
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| 239 |
+
from pathlib import Path
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| 240 |
+
import cv2
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+
import numpy as np
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+
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+
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+
class WanFallDataset(Dataset):
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+
"""
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+
PyTorch Dataset for WanFall activity recognition.
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+
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+
This dataset provides both temporal segments and video paths for loading.
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+
"""
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| 250 |
+
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| 251 |
+
def __init__(
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+
self,
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+
split='train',
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+
video_root=None,
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| 255 |
+
transform=None,
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+
target_transform=None,
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+
return_segments=True,
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+
fps=16,
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+
num_frames=81
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+
):
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+
"""
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| 262 |
+
Args:
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+
split: One of 'train', 'validation', 'test'
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| 264 |
+
video_root: Root directory containing video files (e.g., /path/to/wanfall/videos)
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| 265 |
+
transform: Optional transform to apply to video frames
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| 266 |
+
target_transform: Optional transform to apply to labels
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| 267 |
+
return_segments: If True, returns all temporal segments. If False, returns one sample per video.
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| 268 |
+
fps: Frame rate of videos (default: 16)
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| 269 |
+
num_frames: Number of frames per video (default: 81)
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| 270 |
+
"""
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| 271 |
+
super().__init__()
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| 272 |
+
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| 273 |
+
# Load labels (all temporal segments)
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| 274 |
+
labels_ds = load_dataset("simplexsigil2/wanfall")
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| 275 |
+
self.labels_df = pd.DataFrame(labels_ds["train"])
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| 276 |
+
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| 277 |
+
# Load split
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| 278 |
+
split_ds = load_dataset("simplexsigil2/wanfall", "random")
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| 279 |
+
split_df = pd.DataFrame(split_ds[split])
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| 280 |
+
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| 281 |
+
# Merge to get labeled segments for this split
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| 282 |
+
self.data = pd.merge(split_df, self.labels_df, on="path", how="left")
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| 283 |
+
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| 284 |
+
# If not returning segments, keep only one row per video
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| 285 |
+
if not return_segments:
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+
self.data = self.data.groupby('path').first().reset_index()
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| 287 |
+
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| 288 |
+
self.video_root = Path(video_root) if video_root else None
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| 289 |
+
self.transform = transform
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| 290 |
+
self.target_transform = target_transform
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| 291 |
+
self.return_segments = return_segments
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| 292 |
+
self.fps = fps
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| 293 |
+
self.num_frames = num_frames
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| 294 |
+
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| 295 |
+
def __len__(self):
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| 296 |
+
return len(self.data)
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| 297 |
+
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| 298 |
+
def __getitem__(self, idx):
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| 299 |
+
row = self.data.iloc[idx]
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| 300 |
+
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| 301 |
+
# Get video path
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| 302 |
+
video_path = row['path']
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| 303 |
+
if self.video_root is not None:
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| 304 |
+
video_path = self.video_root / f"{video_path}.mp4"
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| 305 |
+
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| 306 |
+
# Load video frames (if video_root is provided)
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| 307 |
+
frames = None
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| 308 |
+
if self.video_root is not None and Path(video_path).exists():
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| 309 |
+
frames = self._load_video(video_path)
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| 310 |
+
if self.transform is not None:
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| 311 |
+
frames = self.transform(frames)
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| 312 |
+
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| 313 |
+
# Get label information
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| 314 |
+
label = int(row['label'])
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| 315 |
+
start_time = float(row['start'])
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| 316 |
+
end_time = float(row['end'])
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| 317 |
+
|
| 318 |
+
# Convert timestamps to frame indices
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| 319 |
+
start_frame = int(start_time * self.fps)
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| 320 |
+
end_frame = int(end_time * self.fps)
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| 321 |
+
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| 322 |
+
if self.target_transform is not None:
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| 323 |
+
label = self.target_transform(label)
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| 324 |
+
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| 325 |
+
# Return data
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| 326 |
+
sample = {
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| 327 |
+
'video_path': row['path'],
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| 328 |
+
'label': label,
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| 329 |
+
'start_time': start_time,
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| 330 |
+
'end_time': end_time,
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| 331 |
+
'start_frame': start_frame,
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| 332 |
+
'end_frame': end_frame,
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| 333 |
+
}
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| 334 |
+
|
| 335 |
+
if frames is not None:
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| 336 |
+
sample['frames'] = frames
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| 337 |
+
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| 338 |
+
return sample
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| 339 |
+
|
| 340 |
+
def _load_video(self, video_path):
|
| 341 |
+
"""Load video frames using OpenCV."""
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| 342 |
+
cap = cv2.VideoCapture(str(video_path))
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| 343 |
+
frames = []
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| 344 |
+
|
| 345 |
+
while True:
|
| 346 |
+
ret, frame = cap.read()
|
| 347 |
+
if not ret:
|
| 348 |
+
break
|
| 349 |
+
# Convert BGR to RGB
|
| 350 |
+
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
|
| 351 |
+
frames.append(frame)
|
| 352 |
+
|
| 353 |
+
cap.release()
|
| 354 |
+
|
| 355 |
+
# Convert to numpy array (T, H, W, C)
|
| 356 |
+
frames = np.array(frames)
|
| 357 |
+
|
| 358 |
+
return frames
|
| 359 |
+
|
| 360 |
+
|
| 361 |
+
# Example usage
|
| 362 |
+
def get_dataloaders(video_root, batch_size=32, num_workers=4):
|
| 363 |
+
"""Create PyTorch DataLoaders for train/val/test splits."""
|
| 364 |
+
|
| 365 |
+
# Optional: Define transforms
|
| 366 |
+
from torchvision import transforms
|
| 367 |
+
|
| 368 |
+
transform = transforms.Compose([
|
| 369 |
+
transforms.Lambda(lambda x: torch.from_numpy(x).float()),
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| 370 |
+
transforms.Lambda(lambda x: x.permute(0, 3, 1, 2)), # (T, H, W, C) -> (T, C, H, W)
|
| 371 |
+
transforms.Lambda(lambda x: x / 255.0), # Normalize to [0, 1]
|
| 372 |
+
])
|
| 373 |
+
|
| 374 |
+
# Create datasets
|
| 375 |
+
train_dataset = WanFallDataset(
|
| 376 |
+
split='train',
|
| 377 |
+
video_root=video_root,
|
| 378 |
+
transform=transform,
|
| 379 |
+
return_segments=True
|
| 380 |
+
)
|
| 381 |
+
|
| 382 |
+
val_dataset = WanFallDataset(
|
| 383 |
+
split='validation',
|
| 384 |
+
video_root=video_root,
|
| 385 |
+
transform=transform,
|
| 386 |
+
return_segments=True
|
| 387 |
+
)
|
| 388 |
+
|
| 389 |
+
test_dataset = WanFallDataset(
|
| 390 |
+
split='test',
|
| 391 |
+
video_root=video_root,
|
| 392 |
+
transform=transform,
|
| 393 |
+
return_segments=True
|
| 394 |
+
)
|
| 395 |
+
|
| 396 |
+
# Create dataloaders
|
| 397 |
+
train_loader = DataLoader(
|
| 398 |
+
train_dataset,
|
| 399 |
+
batch_size=batch_size,
|
| 400 |
+
shuffle=True,
|
| 401 |
+
num_workers=num_workers,
|
| 402 |
+
pin_memory=True
|
| 403 |
+
)
|
| 404 |
+
|
| 405 |
+
val_loader = DataLoader(
|
| 406 |
+
val_dataset,
|
| 407 |
+
batch_size=batch_size,
|
| 408 |
+
shuffle=False,
|
| 409 |
+
num_workers=num_workers,
|
| 410 |
+
pin_memory=True
|
| 411 |
+
)
|
| 412 |
+
|
| 413 |
+
test_loader = DataLoader(
|
| 414 |
+
test_dataset,
|
| 415 |
+
batch_size=batch_size,
|
| 416 |
+
shuffle=False,
|
| 417 |
+
num_workers=num_workers,
|
| 418 |
+
pin_memory=True
|
| 419 |
+
)
|
| 420 |
+
|
| 421 |
+
return train_loader, val_loader, test_loader
|
| 422 |
+
|
| 423 |
+
|
| 424 |
+
# Example training loop snippet
|
| 425 |
+
if __name__ == "__main__":
|
| 426 |
+
video_root = Path("/path/to/wanfall/videos")
|
| 427 |
+
|
| 428 |
+
train_loader, val_loader, test_loader = get_dataloaders(
|
| 429 |
+
video_root=video_root,
|
| 430 |
+
batch_size=16,
|
| 431 |
+
num_workers=4
|
| 432 |
+
)
|
| 433 |
+
|
| 434 |
+
print(f"Train batches: {len(train_loader)}")
|
| 435 |
+
print(f"Val batches: {len(val_loader)}")
|
| 436 |
+
print(f"Test batches: {len(test_loader)}")
|
| 437 |
+
|
| 438 |
+
# Inspect first batch
|
| 439 |
+
for batch in train_loader:
|
| 440 |
+
print("\nBatch keys:", batch.keys())
|
| 441 |
+
if 'frames' in batch:
|
| 442 |
+
print(f"Frames shape: {batch['frames'].shape}")
|
| 443 |
+
print(f"Labels shape: {batch['label'].shape}")
|
| 444 |
+
print(f"Label range: [{batch['label'].min()}, {batch['label'].max()}]")
|
| 445 |
+
break
|
| 446 |
+
```
|
| 447 |
+
|
| 448 |
+
### Converting Temporal Segments to Frame-Level Labels
|
| 449 |
+
|
| 450 |
+
If you need frame-level labels for dense prediction tasks:
|
| 451 |
+
|
| 452 |
+
```python
|
| 453 |
+
import numpy as np
|
| 454 |
+
|
| 455 |
+
|
| 456 |
+
def temporal_segments_to_frames(segments_df, fps=16, num_frames=81):
|
| 457 |
+
"""
|
| 458 |
+
Convert temporal segments to frame-level labels.
|
| 459 |
+
|
| 460 |
+
Args:
|
| 461 |
+
segments_df: DataFrame with 'start', 'end', 'label' columns for one video
|
| 462 |
+
fps: Frame rate (default: 16)
|
| 463 |
+
num_frames: Number of frames per video (default: 81)
|
| 464 |
+
|
| 465 |
+
Returns:
|
| 466 |
+
Array of shape (num_frames,) with label for each frame
|
| 467 |
+
"""
|
| 468 |
+
# Initialize with -1 (unlabeled)
|
| 469 |
+
frame_labels = np.full(num_frames, -1, dtype=np.int32)
|
| 470 |
+
|
| 471 |
+
# Sort segments by start time
|
| 472 |
+
segments_df = segments_df.sort_values('start')
|
| 473 |
+
|
| 474 |
+
for _, seg in segments_df.iterrows():
|
| 475 |
+
start_frame = int(seg['start'] * fps)
|
| 476 |
+
end_frame = min(int(seg['end'] * fps), num_frames - 1)
|
| 477 |
+
|
| 478 |
+
# Assign label to frames
|
| 479 |
+
frame_labels[start_frame:end_frame + 1] = seg['label']
|
| 480 |
+
|
| 481 |
+
return frame_labels
|
| 482 |
+
|
| 483 |
+
|
| 484 |
+
# Example usage with PyTorch Dataset
|
| 485 |
+
class WanFallFrameLevelDataset(Dataset):
|
| 486 |
+
"""PyTorch Dataset with frame-level labels."""
|
| 487 |
+
|
| 488 |
+
def __init__(self, split='train', video_root=None, transform=None):
|
| 489 |
+
super().__init__()
|
| 490 |
+
|
| 491 |
+
# Load labels and split
|
| 492 |
+
labels_ds = load_dataset("simplexsigil2/wanfall")
|
| 493 |
+
self.labels_df = pd.DataFrame(labels_ds["train"])
|
| 494 |
+
|
| 495 |
+
split_ds = load_dataset("simplexsigil2/wanfall", "random")
|
| 496 |
+
split_df = pd.DataFrame(split_ds[split])
|
| 497 |
+
|
| 498 |
+
# Get unique videos in this split
|
| 499 |
+
self.video_paths = split_df['path'].tolist()
|
| 500 |
+
self.video_root = Path(video_root) if video_root else None
|
| 501 |
+
self.transform = transform
|
| 502 |
+
|
| 503 |
+
def __len__(self):
|
| 504 |
+
return len(self.video_paths)
|
| 505 |
+
|
| 506 |
+
def __getitem__(self, idx):
|
| 507 |
+
video_path = self.video_paths[idx]
|
| 508 |
+
|
| 509 |
+
# Load video frames
|
| 510 |
+
frames = None
|
| 511 |
+
if self.video_root is not None:
|
| 512 |
+
full_path = self.video_root / f"{video_path}.mp4"
|
| 513 |
+
if full_path.exists():
|
| 514 |
+
frames = self._load_video(full_path)
|
| 515 |
+
if self.transform is not None:
|
| 516 |
+
frames = self.transform(frames)
|
| 517 |
+
|
| 518 |
+
# Get all segments for this video and convert to frame labels
|
| 519 |
+
video_segments = self.labels_df[self.labels_df['path'] == video_path]
|
| 520 |
+
frame_labels = temporal_segments_to_frames(video_segments)
|
| 521 |
+
|
| 522 |
+
return {
|
| 523 |
+
'video_path': video_path,
|
| 524 |
+
'frames': frames,
|
| 525 |
+
'labels': torch.from_numpy(frame_labels), # Shape: (81,)
|
| 526 |
+
}
|
| 527 |
+
|
| 528 |
+
def _load_video(self, video_path):
|
| 529 |
+
"""Load video frames."""
|
| 530 |
+
cap = cv2.VideoCapture(str(video_path))
|
| 531 |
+
frames = []
|
| 532 |
+
while True:
|
| 533 |
+
ret, frame = cap.read()
|
| 534 |
+
if not ret:
|
| 535 |
+
break
|
| 536 |
+
frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
|
| 537 |
+
frames.append(frame)
|
| 538 |
+
cap.release()
|
| 539 |
+
return np.array(frames)
|
| 540 |
+
```
|
| 541 |
+
|
| 542 |
+
### Best Practices
|
| 543 |
+
|
| 544 |
+
**1. Temporal Segment vs Frame-Level:**
|
| 545 |
+
- Use temporal segments directly for action localization and detection tasks
|
| 546 |
+
- Convert temporal segments to frame-level labels for dense prediction tasks (see example above)
|
| 547 |
+
- The dataset provides temporal segments; use the conversion function for frame-level labels
|
| 548 |
+
|
| 549 |
+
**2. Handling Multiple Segments per Video:**
|
| 550 |
+
- Set `return_segments=True` to get all temporal segments (one sample per segment)
|
| 551 |
+
- Set `return_segments=False` to get one sample per video (useful for video-level classification)
|
| 552 |
+
|
| 553 |
+
**3. Data Loading:**
|
| 554 |
+
- Videos are stored separately and not included in this HuggingFace dataset
|
| 555 |
+
- Provide `video_root` path where videos are stored with structure: `{video_root}/{path}.mp4`
|
| 556 |
+
- Example: `{video_root}/fall/fall_ch_001.mp4`
|
| 557 |
+
|
| 558 |
+
**4. Memory Efficiency:**
|
| 559 |
+
- Load videos on-demand in `__getitem__` rather than pre-loading
|
| 560 |
+
- Use `num_workers > 0` in DataLoader for parallel loading
|
| 561 |
+
- Consider using video decoding libraries like `decord` or `torchvision.io` for faster loading
|
| 562 |
+
|
| 563 |
+
**5. Temporal Sampling:**
|
| 564 |
+
- For long videos or limited memory, sample frames instead of loading all 81 frames
|
| 565 |
+
- Use uniform sampling, random sampling, or segment-focused sampling based on task
|
| 566 |
+
|
| 567 |
+
**6. Label Handling:**
|
| 568 |
+
- Labels are integers 0-15 for the 16 activity classes
|
| 569 |
+
- `-1` indicates unlabeled frames (when converting to frame-level labels)
|
| 570 |
+
- Consider class balancing or weighted sampling for imbalanced classes
|
| 571 |
+
|
| 572 |
## Technical Properties
|
| 573 |
|
| 574 |
### Video Specifications
|