129 lines
4.2 KiB
Python
129 lines
4.2 KiB
Python
##################################################
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# Copyright (c) Xuanyi Dong [GitHub D-X-Y], 2019 #
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##################################################
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import math, torch
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import torch.nn as nn
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def select2withP(logits, tau, just_prob=False, num=2, eps=1e-7):
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if tau <= 0:
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new_logits = logits
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probs = nn.functional.softmax(new_logits, dim=1)
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else:
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while True: # a trick to avoid the gumbels bug
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gumbels = -torch.empty_like(logits).exponential_().log()
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new_logits = (logits.log_softmax(dim=1) + gumbels) / tau
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probs = nn.functional.softmax(new_logits, dim=1)
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if (
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(not torch.isinf(gumbels).any())
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and (not torch.isinf(probs).any())
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and (not torch.isnan(probs).any())
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):
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break
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if just_prob:
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return probs
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# with torch.no_grad(): # add eps for unexpected torch error
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# probs = nn.functional.softmax(new_logits, dim=1)
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# selected_index = torch.multinomial(probs + eps, 2, False)
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with torch.no_grad(): # add eps for unexpected torch error
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probs = probs.cpu()
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selected_index = torch.multinomial(probs + eps, num, False).to(logits.device)
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selected_logit = torch.gather(new_logits, 1, selected_index)
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selcted_probs = nn.functional.softmax(selected_logit, dim=1)
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return selected_index, selcted_probs
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def ChannelWiseInter(inputs, oC, mode="v2"):
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if mode == "v1":
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return ChannelWiseInterV1(inputs, oC)
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elif mode == "v2":
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return ChannelWiseInterV2(inputs, oC)
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else:
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raise ValueError("invalid mode : {:}".format(mode))
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def ChannelWiseInterV1(inputs, oC):
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assert inputs.dim() == 4, "invalid dimension : {:}".format(inputs.size())
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def start_index(a, b, c):
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return int(math.floor(float(a * c) / b))
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def end_index(a, b, c):
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return int(math.ceil(float((a + 1) * c) / b))
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batch, iC, H, W = inputs.size()
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outputs = torch.zeros((batch, oC, H, W), dtype=inputs.dtype, device=inputs.device)
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if iC == oC:
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return inputs
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for ot in range(oC):
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istartT, iendT = start_index(ot, oC, iC), end_index(ot, oC, iC)
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values = inputs[:, istartT:iendT].mean(dim=1)
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outputs[:, ot, :, :] = values
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return outputs
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def ChannelWiseInterV2(inputs, oC):
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assert inputs.dim() == 4, "invalid dimension : {:}".format(inputs.size())
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batch, C, H, W = inputs.size()
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if C == oC:
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return inputs
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else:
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return nn.functional.adaptive_avg_pool3d(inputs, (oC, H, W))
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# inputs_5D = inputs.view(batch, 1, C, H, W)
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# otputs_5D = nn.functional.interpolate(inputs_5D, (oC,H,W), None, 'area', None)
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# otputs = otputs_5D.view(batch, oC, H, W)
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# otputs_5D = nn.functional.interpolate(inputs_5D, (oC,H,W), None, 'trilinear', False)
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# return otputs
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def linear_forward(inputs, linear):
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if linear is None:
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return inputs
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iC = inputs.size(1)
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weight = linear.weight[:, :iC]
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if linear.bias is None:
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bias = None
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else:
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bias = linear.bias
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return nn.functional.linear(inputs, weight, bias)
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def get_width_choices(nOut):
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xsrange = [0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0]
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if nOut is None:
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return len(xsrange)
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else:
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Xs = [int(nOut * i) for i in xsrange]
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# xs = [ int(nOut * i // 10) for i in range(2, 11)]
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# Xs = [x for i, x in enumerate(xs) if i+1 == len(xs) or xs[i+1] > x+1]
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Xs = sorted(list(set(Xs)))
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return tuple(Xs)
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def get_depth_choices(nDepth):
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if nDepth is None:
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return 3
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else:
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assert nDepth >= 3, "nDepth should be greater than 2 vs {:}".format(nDepth)
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if nDepth == 1:
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return (1, 1, 1)
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elif nDepth == 2:
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return (1, 1, 2)
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elif nDepth >= 3:
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return (nDepth // 3, nDepth * 2 // 3, nDepth)
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else:
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raise ValueError("invalid Depth : {:}".format(nDepth))
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def drop_path(x, drop_prob):
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if drop_prob > 0.0:
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keep_prob = 1.0 - drop_prob
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mask = x.new_zeros(x.size(0), 1, 1, 1)
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mask = mask.bernoulli_(keep_prob)
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x = x * (mask / keep_prob)
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# x.div_(keep_prob)
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# x.mul_(mask)
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return x
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