提交 c9e0ade5 编写于 作者: D dengkaipeng

add doc for temporal_shift. test=develop

上级 9344a4eb
......@@ -71,10 +71,31 @@ class TemporalShiftOpMaker : public framework::OpProtoAndCheckerMaker {
"interger.");
AddComment(R"DOC(
This operator calculates the temporal shift features for Input(X).
This operator calculates the temporal shifting features for Input(X).
For details of spectral normalization, please refer to paper:
`Temporal Shift Module <arxiv.org/abs/1802.0595://arxiv.org/abs/1811.08383>`_ .
Input(X) should be in shape of [N*T, C, H, W], while N is the batch
size, T is the temporal segment number, C is the channel number,
H and W is the height and width of features.
Temporal Shifting calculates as follows:
Step 1: Reshape Input(X) to [N, T, C, H, W].
Step 2: Pad 0 to reshaping result in the 2nd(T) dimension with
padding width as 1 on each side, padding result will be in shape
of [N, T+2, C, H, W].
Step 3: Slice padding result as follows:
slice1 = x[:, :T, :C/4, :, :]
slice2 = x[:, 2:T+2, C/4:C/2, :, :]
slice3 = x[:, 1:T+1, C/2:, :, :]
Step 4: Concatenate three slices with :math:`axis=2` and reshape result
to [N*T, C, H, W]
For details of temporal shifting, please refer to paper:
`Temporal Shift Module <http://arxiv.org/abs/1811.08383>`_ .
)DOC");
}
......
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