# Conv3d#

class Conv3d(in_channels, out_channels, kernel_size, stride=1, padding=0, dilation=1, groups=1, bias=True, conv_mode='cross_correlation')[源代码]#

$\text{out}(N_i, C_{\text{out}_j}) = \text{bias}(C_{\text{out}_j}) + \sum_{k = 0}^{C_{\text{in}} - 1} \text{weight}(C_{\text{out}_j}, k) \star \text{input}(N_i, k)$

groups == in_channelsout_channels == K * in_channels ，其中 K 是正整数，该操作也被称为深度方向卷积（depthwise convolution）。

In other words, for an input of size $$(N, C_{in}, T_{int}, H_{in}, W_{in})$$, a depthwise convolution with a depthwise multiplier K, can be constructed by arguments $$(in\_channels=C_{in}, out\_channels=C_{in} \times K, ..., groups=C_{in})$$.

• weight 的shape通常是 (out_channels, in_channels, depth, height, width) , 如果 groups 不为1, shape 将是 (groups, out_channels // groups, in_channels // groups, depth, height, width)

• bias 的shape通常是 (1, out_channels, *1)

>>> import numpy as np
>>> m = M.Conv3d(in_channels=3, out_channels=1, kernel_size=3)
>>> inp = mge.tensor(np.arange(0, 384).astype("float32").reshape(2, 3, 4, 4, 4))
>>> oup = m(inp)
>>> oup.numpy().shape
(2, 1, 2, 2, 2)