Keras reports TypeError: unsupported operand type(s) for +: 'NoneType' and 'int'

Question

I\'m a beginner in Keras and just write a toy example. It reports a TypeError. The code and error are as follows:

Code:

Answer 1

I think @today's answer is very clear. However, not complete. The key thing here is that, if your input doesn't contain num_features, you have to make a Embedding layer next to the input.

So if you use:

inputs = keras.Input(shape=(3,))
embedding = Embedding(voc_size, embed_dim, ..)
X = embedding(inputs)

it also works.