From 8e99eeffddcb2ca00bc77f7a0f6cd9fa5873bbde Mon Sep 17 00:00:00 2001
From: Tilman Kamp <tilmankamp@posteo.de>
Date: Mon, 19 Dec 2016 16:21:39 +0100
Subject: [PATCH] Fix #284; BiRNN with stride 2

---
 util/audio.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/util/audio.py b/util/audio.py
index ff0e8e65..407e6eba 100644
--- a/util/audio.py
+++ b/util/audio.py
@@ -10,6 +10,9 @@ def audiofile_to_input_vector(audio_filename, numcep, numcontext):
     # Get mfcc coefficients
     orig_inputs = mfcc(audio, samplerate=fs, numcep=numcep)
 
+    # We only keep every second feature (BiRNN stride = 2)
+    orig_inputs = orig_inputs[::2]
+
     # For each time slice of the training set, we need to copy the context this makes
     # the numcep dimensions vector into a numcep + 2*numcep*numcontext dimensions
     # because of: