Add support for no indices in advincsub1 for gpuarrray.

theano/gpuarray/subtensor.py

@@ -608,11 +608,6 @@ class GpuAdvancedIncSubtensor1(Op):
         }
         step[0] = 0;
         num_indices = PyArray_SIZE(%(ind)s);
-        if ((num_indices - 1) > LONG_MAX) {
-          PyErr_Format(PyExc_AssertionError,
-                       "num_indices %%lld exceeds LONG_MAX + 1", (long long)num_indices);
-          %(fail)s
-        }
         if (!%(inplace)s) {
           %(out)s = theano_try_copy(%(out)s, %(x)s);
           if (%(out)s == NULL)
@@ -622,6 +617,12 @@ class GpuAdvancedIncSubtensor1(Op):
           %(out)s = %(x)s;
           Py_INCREF(%(out)s);
         }
+        if (num_indices != 0) {
+          if ((num_indices - 1) > LONG_MAX) {
+            PyErr_Format(PyExc_AssertionError,
+                         "num_indices %%lld exceeds LONG_MAX + 1", (long long)num_indices);
+            %(fail)s
+          }
           broadcast_y = PyGpuArray_DIM(%(y)s, 0) == 1;
           for (j = 0; j < num_indices; j++) {
             start[0] = *(dtype_%(ind)s *)PyArray_GETPTR1(%(ind)s, j);
@@ -659,13 +660,14 @@ class GpuAdvancedIncSubtensor1(Op):
             if (ret != GA_NO_ERROR)
               PyErr_SetString(PyExc_RuntimeError, "Failed to set/inc elements");
           }
+        }
         """ % dict(x=inputs[0], y=inputs[1], ind=inputs[2], out=outputs[0],
                    fail=sub['fail'], inplace=int(self.inplace),
                    nd=node.inputs[0].ndim,
                    set_instead_of_inc=int(self.set_instead_of_inc))
 
     def c_code_cache_version(self):
-        return (0,)
+        return (1,)
 
 
 class GpuAdvancedIncSubtensor1_dev20(GpuKernelBase, HideC,