Update lstm_sentiment_analysis_layer.py

Enable training for lstm layer

Author: kelvinkoh0308

深度学习与TensorFlow入门实战-源码和PPT/lesson47-LSTM实战/lstm_sentiment_analysis_layer.py

@@ -69,7 +69,7 @@ def call(self, inputs, training=None):
         x = self.embedding(x)
         # rnn cell compute
         # x: [b, 80, 100] => [b, 64]
-        x = self.rnn(x)
+        x = self.rnn(x,training=training)
 
         # out: [b, 64] => [b, 1]
         x = self.outlayer(x)