forked from mrq/DL-Art-School
52 lines
1.3 KiB
Python
52 lines
1.3 KiB
Python
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import torch
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def sum(tensor, dim=None, keepdim=False):
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if dim is None:
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# sum up all dim
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return torch.sum(tensor)
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else:
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if isinstance(dim, int):
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dim = [dim]
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dim = sorted(dim)
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for d in dim:
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tensor = tensor.sum(dim=d, keepdim=True)
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if not keepdim:
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for i, d in enumerate(dim):
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tensor.squeeze_(d-i)
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return tensor
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def mean(tensor, dim=None, keepdim=False):
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if dim is None:
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# mean all dim
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return torch.mean(tensor)
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else:
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if isinstance(dim, int):
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dim = [dim]
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dim = sorted(dim)
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for d in dim:
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tensor = tensor.mean(dim=d, keepdim=True)
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if not keepdim:
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for i, d in enumerate(dim):
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tensor.squeeze_(d-i)
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return tensor
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def split_feature(tensor, type="split"):
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"""
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type = ["split", "cross"]
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"""
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C = tensor.size(1)
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if type == "split":
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return tensor[:, :C // 2, ...], tensor[:, C // 2:, ...]
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elif type == "cross":
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return tensor[:, 0::2, ...], tensor[:, 1::2, ...]
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def cat_feature(tensor_a, tensor_b):
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return torch.cat((tensor_a, tensor_b), dim=1)
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def pixels(tensor):
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return int(tensor.size(2) * tensor.size(3))
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