Follow the numbers once, then change them yourself. Blue marks the inputs, purple the parameters, and teal the output. Edit values directly on this page; no Python installation is needed.
Make sure you can work through this calculation.Multiply once on each path, add the products, add the bias, and apply ReLU: keep positive values, turn negative values into 0, and leave 0 at 0. Faded nodes show steps not yet reached.
Try changing only the second input from 1 to 2. The extra 1 is first multiplied by weight 3, so the output increases by 3.