Initialize costs with zeros in GPU CTC's C wrapper

Signed-off-by: João Victor Tozatti Risso <joaovictor.risso@gmail.com>

Initialize costs with zeros in GPU CTC's C wrapper
d904c2e5 · João Victor Tozatti Risso · ea887edd · d904c2e5
--- a/theano/gpuarray/ctc_wrapper.c
+++ b/theano/gpuarray/ctc_wrapper.c
@@ -163,7 +163,7 @@ int APPLY_SPECIFIC(ctc_cost_gpu)(PyGpuArrayObject   *  in_activations,
    {
        Py_XDECREF( *out_costs );
-        *out_costs = pygpu_empty( 1, &cost_size, GA_FLOAT, GA_C_ORDER,
+        *out_costs = pygpu_zeros( 1, &cost_size, GA_FLOAT, GA_C_ORDER,
            gpu_context, Py_None );
        if ( NULL == *out_costs )
@@ -176,6 +176,10 @@ int APPLY_SPECIFIC(ctc_cost_gpu)(PyGpuArrayObject   *  in_activations,
            return 1;
        }
    }
+    else
+    {
+        GpuArray_memset( &((*out_costs)->ga), 0 ); 
+    }
    switch ( (*out_costs)->ga.typecode )
    {