add aicpu embeddinglookup grad

mindspore/ops/_grad/grad_array_ops.py

@@ -219,6 +219,24 @@ def get_bprop_embedding_lookup(self):
     return bprop_sparse
 
 
+@bprop_getters.register(P.EmbeddingLookup)
+def get_bprop_embedding_look_up(self):
+    """Generate bprop for EmbeddingLookup"""
+    sub_op = P.Sub()
+    reshape_op = P.Reshape()
+    def bprop(x, indices, offset, out, dout):
+        x_shp = shape_op(x)
+        new_indices = sub_op(indices, offset)
+        # Reshape the 'new_indices'
+        new_indices_shape_changed = (size_op(new_indices),)
+        new_indices = reshape_op(new_indices, new_indices_shape_changed)
+        x_shp_tail = x_shp[1:]
+        actual_dout_shape_changed = new_indices_shape_changed + x_shp_tail
+        actual_dout = reshape_op(dout, actual_dout_shape_changed)
+        return (new_indices, actual_dout, x_shp), zeros_like(indices), zeros_like(offset)
+    return bprop
+
+
 @bprop_getters.register(P.Transpose)
 def get_bprop_transpose(self):
     """Generate bprop for Transpose"""