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@@ -1,4 +1,11 @@ -# pgm -Projet PGM +# CTC implementation for Blocks and Theano Thomas Mesnard, Alex Auvolat + +This repository contains an implementation of the CTC cost function (Graves et al., 2006). To avoid numerical underflow, two solutions are implemented: + +- Normalization of the alphas at each timestep +- Calculations in the logarithmic domain + +This repository also contains sample code for applying CTC to two datasets, a simple dummy dataset constituted of artificial data, and code to use the TIMIT dataset. The model on the TIMIT dataset is able to learn up to 50% phoneme accuracy using no handcrafted processing of the signal, but instead uses an end-to-end model composed of convolutions, LSTMs, and the CTC cost function. + |