!6333 add padding grad op

Merge pull request !6333 from wuxuejian/padding_grad

mindspore/ops/_grad/grad_array_ops.py

@@ -244,6 +244,19 @@ def get_bprop_embedding_lookup(self):
     return bprop_sparse
 
 
+@bprop_getters.register(P.Padding)
+def get_bprop_padding(self):
+    """Grad definition for `Padding` operation."""
+
+    def bprop(x, out, dout):
+        shp = shape_op(x)
+        begin = tuple([0 for _ in shp])
+        dx = P.Slice()(dout, begin, shp)
+        return (dx,)
+
+    return bprop
+
+
 @bprop_getters.register(P.Transpose)
 def get_bprop_transpose(self):
     """Generate bprop for Transpose"""

mindspore/ops/_op_impl/aicpu/__init__.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 
 """aicpu ops"""
-from .unique import _unique_aicpu
 from .init_data_set_queue import _init_data_set_queue_aicpu
 from .embedding_lookup import _embedding_lookup_aicpu
 from .padding import _padding_aicpu

mindspore/ops/_op_impl/aicpu/unique.py

@@ -1,31 +0,0 @@
-# Copyright 2020 Huawei Technologies Co., Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-# ============================================================================
-
-"""Unique op"""
-from mindspore.ops.op_info_register import op_info_register, AiCPURegOp, DataType
-
-unique_op_info = AiCPURegOp("Unique") \
-    .fusion_type("OPAQUE") \
-    .input(0, "x", "required") \
-    .output(0, "y", "required") \
-    .output(1, "idx", "required") \
-    .dtype_format(DataType.I32_Default, DataType.I32_Default, DataType.I32_Default) \
-    .dtype_format(DataType.I64_Default, DataType.I64_Default, DataType.I64_Default) \
-    .get_op_info()
-
-@op_info_register(unique_op_info)
-def _unique_aicpu():
-    """Unique AiCPU register"""
-    return