GSoC 2014: Standard Extreme Learning Machines

Finished implementing the standard extreme learning machines (ELMs). I am getting the following results with 550 hidden neurons against the digits datasets,

Training accuracy using the logistic activation function: 0.999444
Training accuracy using the tanh activation function: 1.000000

Fortunately, this algorithm is much easier to implement and debug than multi-layer perceptron :).
I will push a test file soon.

@ogrisel , @larsmans
Yes, but this wouldn't lead to extra computation. Right?

I think that you don't need to clip. Everything might be done in gen_batches.

Are you sure that you need to do list(gen_batches(...))? Is gen_batches alone working?