!10997 fix bert init

From: @VectorSL
Reviewed-by: @gaoxiong1,@c_34
Signed-off-by: @c_34

model_zoo/official/nlp/bert/src/__init__.py

@@ -17,7 +17,8 @@ from .bert_for_pre_training import BertNetworkWithLoss, BertPreTraining, \
     BertPretrainingLoss, GetMaskedLMOutput, GetNextSentenceOutput, \
     BertTrainOneStepCell, BertTrainOneStepWithLossScaleCell, \
     BertTrainAccumulationAllReduceEachWithLossScaleCell, \
-    BertTrainAccumulationAllReducePostWithLossScaleCell
+    BertTrainAccumulationAllReducePostWithLossScaleCell, \
+    BertTrainOneStepWithLossScaleCellForAdam
 from .bert_model import BertAttention, BertConfig, BertEncoderCell, BertModel, \
     BertOutput, BertSelfAttention, BertTransformer, EmbeddingLookup, \
     EmbeddingPostprocessor, RelaPosEmbeddingsGenerator, RelaPosMatrixGenerator, \
@@ -31,5 +32,6 @@ __all__ = [
     "BertAttention", "BertConfig", "BertEncoderCell", "BertModel", "BertOutput",
     "BertSelfAttention", "BertTransformer", "EmbeddingLookup",
     "EmbeddingPostprocessor", "RelaPosEmbeddingsGenerator", "AdamWeightDecayForBert",
-    "RelaPosMatrixGenerator", "SaturateCast", "CreateAttentionMaskFromInputMask"
+    "RelaPosMatrixGenerator", "SaturateCast", "CreateAttentionMaskFromInputMask",
+    "BertTrainOneStepWithLossScaleCellForAdam"
 ]