SobelX returns a constant tensor with shape [3,3,1,1]
containing the values of the Sobel operator along X
Convolving a 2D signal (tensor with shape [height, widht, 1])
gives as output the directional derivative along the X axis of the signal
SobelY returns a constant tensor with shape [3,3,1,1]
containing the values of the Sobel operator along Y
Convolving a 2D signal (tensor with shape [height, widht, 1])
gives as output the directional derivative along the Y axis of the signal
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