Added check in case flattened array is 1d.

theano/gpuarray/subtensor.py

@@ -679,6 +679,20 @@ class GpuAdvancedIncSubtensor(HideC, tensor.AdvancedIncSubtensor):
         # build the indices and use it
         index = idx_[p:] + [slice(None)] * (len(x_flat.shape) - len(idx_[p:]) - 1)
         take_idx = sum(i * s for i, s in zip(nidx, strides))
+        if index == []:
+            for j, i in enumerate(take_idx.flatten()):
+                if y_flat.shape == ():
+                    val = y_flat
+                else:
+                    val = y_flat[j]
+
+                tmp = pygpu.elemwise.elemwise2(
+                    x_flat[i], '+', val, x_flat[i],
+                    broadcast=True,
+                    convert_f16=True
+                )
+                x_flat.__setitem__(i, tmp)
+        else:
             k = get_iadd(node.inputs[0], node.inputs[1])
             if x_flat.shape[-len(y_flat.shape):] == y_flat.shape or y_flat.shape == ():
                 # y_flat has to be broadcast over axes of x_flat[i]
@@ -694,6 +708,7 @@ class GpuAdvancedIncSubtensor(HideC, tensor.AdvancedIncSubtensor):
                         convert_f16=True
                     )
                     x_flat[i].__setitem__(index, tmp)
+
             else:
                 # y_flat's first axis corresponds to first exist of x_flat
                 for j, i in enumerate(take_idx.flatten()):