nn_2layer.jpg
The image displays a schematic diagram of an artificial neural network, arranged horizontally from left to right on a white background. The diagram is organized into four distinct vertical columns, each representing a layer of the network.

At the very top, there are text labels identifying each column. From left to right, they read: "Input layer", "Hidden layer 1", "Hidden layer 2", and "Output layer".

The first column on the far left is labeled "Input layer". It contains four solid green circles arranged vertically in a straight line. To the left of these circles are text labels with arrows pointing toward them. From top to bottom, these labels read: "Input #1", "Input #2", "Input #3", and "Input #4".

The second column is labeled "Hidden layer 1". It contains five solid blue-purple circles arranged vertically. These circles are slightly larger than the input nodes. Every single green circle from the Input layer is connected to every one of these five blue-purple circles by thin grey lines. Each line has a small arrowhead pointing toward the right, indicating the direction of data flow.

The third column is labeled "Hidden layer 2". It also contains five solid blue-purple circles arranged vertically, identical in appearance and position relative to the previous layer's nodes. Similar to the first connection, every one of the five blue-purple circles from Hidden layer 1 is connected to every one of the five blue-purple circles in this column by thin grey lines with arrowheads pointing rightward.

The fourth column on the far right is labeled "Output layer". It contains three solid red-pink circles arranged vertically. Every single circle from Hidden layer 2 is connected to each of these three output circles by thin grey lines with arrowheads pointing rightward, completing the network structure. The connections between all layers are fully dense, meaning every node in a preceding layer connects to every node in the subsequent layer.
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