Some minor changes and renaming of files; starting documentation

src/ctc/ctc-supervision.h → src/ctc/cctc-supervision.h

-// lat/ctc-supervision.h
+// lat/cctc-supervision.h
 
 // Copyright       2015  Johns Hopkins University (Author: Daniel Povey)
 
@@ -34,7 +34,9 @@
 namespace kaldi {
 
 // CTC means Connectionist Temporal Classification, see the paper by Graves et
-// al.
+// al.  CCTC means context-dependent CTC, which
+//
+
 //
 // What we are implementing here is some things relating to computation of the
 // CTC objective function.  The normal information required to compute the
@@ -201,9 +203,9 @@ void AddBlanksToProtoSupervision(const CtcSupervisionOptions &options,
       - Exactly one copy of that phone symbol. 
 
       - Respectively (before and after) each real phone symbol mentioned above,
-        optional repeats of the blank symbol (symbol 0).  The time information for these
-        instances of the blank symbol will be the same as the phone symbol we
-        generated it from.
+        optional repeats of the blank symbol (symbol 0).  The time information
+        for these instances of the blank symbol will be the same as the phone
+        symbol we generated it from.
          
      This fst will have a state 0 which is both initial and final.  Let's
      suppose we have a phone-in-context a.  first an arc from state 0 to a new

src/doc/ctc.dox

+// doc/ctc.dox
+
+
+// Copyright 2015   Johns Hopkins University (author: Daniel Povey)
+
+// See ../../COPYING for clarification regarding multiple authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//  http://www.apache.org/licenses/LICENSE-2.0
+
+// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
+// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
+// MERCHANTABLITY OR NON-INFRINGEMENT.
+// See the Apache 2 License for the specific language governing permissions and
+// limitations under the License.
+
+namespace kaldi {
+
+/**
+  \page ctc  Connectionist Temporal Classifiction
+
+  \section Introduction
+
+  This page describes the support for Connectionist Temporal Classifiction (CTC)
+  in Kaldi.  At the current time CTC is only supported in the nnet3 setup, but
+  the non-neural-net parts of the CTC code are designed to be independent of the
+  neural net implementation so porting it to other setups such as nnet1 and nnet2
+  should be possible.
+
+  The original CTC paper is "Connectionist temporal classification: labelling
+  unsegmented sequence data with recurrent neural networks" by Alex Graves et al.
+  The core of CTC is somewhat indepenent of of the exact network topology
+  Originally the idea of CTC was to have the network output words directly, but
+  more recent work by Google, e.g.
+  "Fast and Accurate Recurrent Neural Network Acoustic Models for Speech
+  Recognition" by Hasim Sak, Andrew Senior et al.
+
+ Todo: finish this intro.
+
+
+
+
+
+*/
+
+
+}