modify code style

asr/asr_base.py

@@ -7,6 +7,7 @@ from .asr_observer import AsrObserver
 
 class AsrBase:
     def __init__(self):
+        self._hot_words_file = ''
         self._sample_rate = 32000
         self._samples_per_read = 100
         self._observers = []

asr/sherpa_ncnn_asr.py

@@ -37,12 +37,12 @@ class SherpaNcnnAsr(AsrBase):
             joiner_param=base_path + '/joiner_jit_trace-pnnx.ncnn.param',
             joiner_bin=base_path + '/joiner_jit_trace-pnnx.ncnn.bin',
             num_threads=4,
-            decoding_method="modified_beam_search",
+            decoding_method='modified_beam_search',
             enable_endpoint_detection=True,
             rule1_min_trailing_silence=2.4,
             rule2_min_trailing_silence=1.2,
             rule3_min_utterance_length=300,
-            hotwords_file="",
+            hotwords_file=self._hot_words_file,
             hotwords_score=1.5,
         )
         return recognizer