title: How many neurons does the CNN input layer have?
body: <p>In all the literature they say the input layer of a convnet is a tensor of shape (width, height, channels). I understand that a fully connected network has an input layer with the number of neurons same as the number of pixels in an image(considering grayscale image). So, my question is how many neurons are in the input layer of a Convolutional Neural Network? The <a href="https://i.stack.imgur.com/dGhfp.png" rel="noreferrer">below image</a>seems misleading(or I have understood it wrong) It says 3 neurons in the input layer. If so what do these 3 neurons represent? Are they tensors? From my understanding of CNN shouldn't there be just one neuron of size (height, width, channel)? Please correct me if I am wrong</p>