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I need some explanation about the following paragraph (page 3) from the paper A Novel Approach for Robust Multi Human Action Detection and Recognition based on 3-Dimentional Convolutional Neural Networks.

We introduce a 3D convolution neural network with the following notations: $I(x, y, d)$ as an input video with a size of $x y$ and $d$ the temporal depth

What is "temporal depth"? Is it the number of frames?

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Temporal Depth is a third parameter of a time series data. For example if you have a video clip of length 25 frames and on training a model you are giving first five frames with respect to time. Your temporal depth will be 5.

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