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I have the following data

($x^1_i$, $y^1_i$) for $i=1,2,...N_1$

($x^2_i$, $y^2_i$) for $i=1,2,...N_2$

...

($x^m_i$, $y^m_i$) for $i=1,2,...N_m$

Is it possible to train a neural net to produce some $y_k$ where $k<=min(N)$ given a input ${x_1, x_2, ..., x_{k-1}}$?

If so any suggestion of documentation/ library I can look at (preferably python)?

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Yes, this is a straightforward application for neural networks. In this case yk are the outputs of the last layer ("classifier"); xk is a feature vector and yk is what it gets classified into. For simplicity prepare your data so that N is the same for all. The problem you have is perhaps that in the case of time series you won't have enough data: you need (ideally) many 1000's of examples to train a network, which in this case means time series, not points. Look at the specialized literature on neural networks for time series prediction for ideas on network architecture.

Library: try Pylearn2 at http://deeplearning.net/software/pylearn2/ It's not the only good option but it should serve you well.

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