Course 4, Week 1, Assignment 2, The first argument to `Layer.call` must always be passed

[ai_curious]

The reason the solution shown above is the ‘fix’ is that when using the Sequential API input_shape is an (optional) argument to the first layer, and thus needs to be within the parentheses constructing it (the ZeroPadding2D layer in this case.); not provided within a second set of parentheses on its own. This code kind of mixes the Sequential API and Functional API styles in a way the parser didn’t welcome . Below is a thread providing compare and contrast of the two TF Model APIs:

Tips for troubles with Sequential and Functional API syntax

Plenty of people have trouble with the syntax of Keras model creation. What’s up with the square brackets? The commas? That weird (x) thing at the end? Without going too deep on a TensorFlow tutorial, I thought I’d share a few things that might help simplify what’s going on. First, it’s important to remember that TensorFlow is based on a graph model. Even though eager execution now allows evaluation of operations immediately, without building graphs, the graph influence is pervasive. I find i…