Merge pull request #4288 from nouiz/err_msg

doc/tutorial/faq_tutorial.txt

@@ -64,7 +64,7 @@ Defining the theano function
 
 .. code-block:: python
 
-   f = theano.function(..., updates=updates)
+   f = theano.function(..., updates=[(lookup_table, updates)])
 
 Note that you can compute the gradient of the cost function w.r.t.
 the entire lookup_table, and the gradient will have nonzero rows only

theano/sandbox/cuda/__init__.py

@@ -572,7 +572,7 @@ def use(device,
                     if config.lib.cnmem > 1:
                         cnmem_enabled = "enabled with initial size: %d MB" % config.lib.cnmem
                     else:
-                        cnmem = min(config.lib.cnmem, 0.98) * 100
+                        cnmem = min(config.lib.cnmem, 0.95) * 100
                         cnmem_enabled = "enabled with initial size: %.1f%% of memory" % cnmem
                 else:
                     cnmem_enabled = "disabled"
@@ -596,7 +596,6 @@ def use(device,
                     cudnn_version,),
                       file=sys.stderr)
                 if warn:
-                    import warnings
                     warnings.warn(warn)
 
             if device_properties(use.device_number)['regsPerBlock'] < 16384:

theano/sandbox/cuda/cuda_ndarray.cu

@@ -4071,7 +4071,16 @@ int CudaNdarray_CopyFromCudaNdarray(CudaNdarray * self,
             }; break;
         default:
             {
-                assert (cudaSuccess == cudaGetLastError());
+                cudaError_t err = cudaGetLastError();
+                if(cudaSuccess != err){
+                    PyErr_Format(PyExc_RuntimeError,
+                                 "Unexpected Cuda error: %s: %s\n",
+                                 "CudaNdarray_CopyFromCudaNdarray",
+                                 cudaGetErrorString(err));
+                    Py_XDECREF(new_other);
+                    return -1;
+                }
+
                 if (verbose)
                     fprintf(stderr,
                             "Copying with default version unbroadcast=%d\n",
@@ -4094,7 +4103,7 @@ int CudaNdarray_CopyFromCudaNdarray(CudaNdarray * self,
                         CudaNdarray_DEV_DATA(self),
                         (const int *)CudaNdarray_DEV_STRIDES(self));
                 CNDA_THREAD_SYNC;
-                cudaError_t err = cudaGetLastError();
+                err = cudaGetLastError();
                 if(verbose>1)
                     fprintf(stderr,
                             "INFO k_elemwise_unary_rowmaj (n_blocks=%i,"