What are the mathematical nn layer parameters in the documentation?

Many layer transformation functions at torch.nn have parameters like N, C_out, L_out (see http://pytorch.org/docs/master/nn.html#torch.nn.Conv1d) or N, C, H_out,W_out (see torch.nn.MaxPool2d). What are they?

N: batch size
C: channels of conv
H: img size height(for conv2d)
W: img size width(for conv2d)
L: seq length (for conv1d)