demos/speech_recognition_deepspeech: list -> extra dim (#3555)

Author: Wovchena

demos/speech_recognition_deepspeech_demo/python/asr_utils/rnn_seq_pipeline.py

@@ -80,7 +80,7 @@ def _process_block(self, mfcc_features, finish=False):
         self.infer_request.infer(inputs={
             self.p['in_state_c']: state_c,
             self.p['in_state_h']: state_h,
-            self.p['in_data']: [mfcc_features],
+            self.p['in_data']: mfcc_features[None],
         })
         output_names = {'out_state_c', 'out_state_h', 'out_data'}
         infer_res = {name: self.infer_request.get_tensor(self.p[name]).data.copy() for name in output_names}