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@ -33,16 +33,20 @@ class RandomErasing:
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'const' - erase block is constant color of 0 for all channels
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'rand' - erase block is same per-cannel random (normal) color
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'pixel' - erase block is per-pixel random (normal) color
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max_count: maximum number of erasing blocks per image, area per box is scaled by count.
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per-image count is randomly chosen between 1 and this value.
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"""
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def __init__(
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self,
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probability=0.5, sl=0.02, sh=1/3, min_aspect=0.3,
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mode='const', device='cuda'):
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mode='const', max_count=1, device='cuda'):
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self.probability = probability
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self.sl = sl
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self.sh = sh
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self.min_aspect = min_aspect
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self.min_count = 1
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self.max_count = max_count
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mode = mode.lower()
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self.rand_color = False
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self.per_pixel = False
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@ -58,9 +62,13 @@ class RandomErasing:
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if random.random() > self.probability:
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return
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area = img_h * img_w
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for attempt in range(100):
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target_area = random.uniform(self.sl, self.sh) * area
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aspect_ratio = random.uniform(self.min_aspect, 1 / self.min_aspect)
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count = self.min_count if self.min_count == self.max_count else \
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random.randint(self.min_count, self.max_count)
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for _ in range(count):
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for attempt in range(10):
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target_area = random.uniform(self.sl, self.sh) * area / count
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log_ratio = (math.log(self.min_aspect), math.log(1 / self.min_aspect))
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aspect_ratio = math.exp(random.uniform(*log_ratio))
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h = int(round(math.sqrt(target_area * aspect_ratio)))
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w = int(round(math.sqrt(target_area / aspect_ratio)))
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if w < img_w and h < img_h:
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