Merge two if statements in infer

infer.py

@@ -90,18 +90,19 @@ def infer():
     # decoders only accept string encoded in utf-8
     vocab_list = [chars.encode("utf-8") for chars in data_generator.vocab_list]
 
-    if args.decoding_method == "ctc_beam_search":
-        ds2_model.init_ext_scorer(args.alpha, args.beta, args.lang_model_path,
-                                  vocab_list)
-
-    ds2_model.logger.info("start inference ...")
-    probs_split = ds2_model.infer_probs_batch(infer_data=infer_data,
-            feeding_dict=data_generator.feeding)
     if args.decoding_method == "ctc_greedy":
+        ds2_model.logger.info("start inference ...")
+        probs_split = ds2_model.infer_probs_batch(infer_data=infer_data,
+            feeding_dict=data_generator.feeding)
         result_transcripts = ds2_model.decode_batch_greedy(
             probs_split=probs_split,
             vocab_list=vocab_list)
     else:
+        ds2_model.init_ext_scorer(args.alpha, args.beta, args.lang_model_path,
+                                  vocab_list)
+        ds2_model.logger.info("start inference ...")
+        probs_split = ds2_model.infer_probs_batch(infer_data=infer_data,
+            feeding_dict=data_generator.feeding)
         result_transcripts = ds2_model.decode_batch_beam_search(
             probs_split=probs_split,
             beam_alpha=args.alpha,