LinearLayer

LinearLayer[n] represents a trainable, fully connected net layer that computes w.x+b with output vector of size n. 

LinearLayer[{n1,n2,…}] represents a layer that outputs an array of dimensions n1×n2×….

LinearLayer[] leaves the dimensions of the output array to be inferred from context.

LinearLayer[n,opts] includes options for initial weights and other parameters. 

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