!213 use StridedSlice instead of Slice in absolute position embedding code in bert model

Merge pull request !213 from yoonlee666/master

mindspore/model_zoo/Bert_NEZHA/bert_model.py

@@ -194,7 +194,7 @@ class EmbeddingPostprocessor(nn.Cell):
         self.dropout = nn.Dropout(1 - dropout_prob)
         self.gather = P.GatherV2()
         self.use_relative_positions = use_relative_positions
-        self.slice = P.Slice()
+        self.slice = P.StridedSlice()
         self.full_position_embeddings = Parameter(initializer
                                                   (TruncatedNormal(initializer_range),
                                                    [max_position_embeddings,
@@ -216,7 +216,7 @@ class EmbeddingPostprocessor(nn.Cell):
             output += token_type_embeddings
         if not self.use_relative_positions:
             _, seq, width = self.shape
-            position_embeddings = self.slice(self.full_position_embeddings, [0, 0], [seq, width])
+            position_embeddings = self.slice(self.full_position_embeddings, (0, 0), (seq, width), (1, 1))
             position_embeddings = self.reshape(position_embeddings, (1, seq, width))
             output += position_embeddings
         output = self.layernorm(output)