You can use the following command to test the pretrained.py and the pretrained files:
```
CUDA_VISIBLE_DEVICES='1' python transducer_stateless/pretrained.py --checkpoint icefall_asr_tedlium3_transducer_stateless/exp/pretrained_average_19_to_29.pt --bpe-model icefall_asr_tedlium3_transducer_stateless/data/lang_bpe_500/bpe.model --method greedy_search icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W01.wav icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W02.wav icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W03.wav
```

The running results are as follows:
```
2022-03-21 16:01:53,281 INFO [pretrained.py:251] {'sample_rate': 16000, 'feature_dim': 80, 'encoder_out_dim': 512, 'subsampling_factor': 4, 'attention_dim': 512, 'nhead': 8, 'dim_feedforward': 2048, 'num_encoder_layers': 12, 'vgg_frontend': False, 'env_info': {'k2-version': '1.13', 'k2-build-type': 'Release', 'k2-with-cuda': True, 'k2-git-sha1': '5ee082ea55f50e8bd42203ba266945ea5a236ab8', 'k2-git-date': 'Sun Feb 27 09:00:48 2022', 'lhotse-version': '1.0.0.dev+git.d917411.clean', 'torch-cuda-available': True, 'torch-cuda-version': '10.1', 'python-version': '3.8', 'icefall-git-branch': 'tedlium3-pruned-transducer-stateless-recipe', 'icefall-git-sha1': 'ad28c8c-dirty', 'icefall-git-date': 'Fri Mar 18 11:39:06 2022', 'icefall-path': '/ceph-meixu/luomingshuang/icefall', 'k2-path': '/ceph-meixu/luomingshuang/k2/k2/python/k2/__init__.py', 'lhotse-path': '/ceph-meixu/luomingshuang/anaconda3/envs/k2-python/lib/python3.8/site-packages/lhotse-1.0.0.dev0+git.d917411.clean-py3.8.egg/lhotse/__init__.py', 'hostname': 'de-74279-k2-train-2-0307200233-b554c565c-lf9qd', 'IP address': '10.177.74.201'}, 'checkpoint': 'icefall_asr_tedlium3_transducer_stateless/exp/pretrained_average_19_to_29.pt', 'bpe_model': 'icefall_asr_tedlium3_transducer_stateless/data/lang_bpe_500/bpe.model', 'method': 'greedy_search', 'sound_files': ['icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W01.wav', 'icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W02.wav', 'icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W03.wav'], 'beam_size': 4, 'context_size': 2, 'max_sym_per_frame': 3, 'blank_id': 0, 'unk_id': 2, 'vocab_size': 500}
2022-03-21 16:01:53,282 INFO [pretrained.py:257] device: cuda:0
2022-03-21 16:01:53,282 INFO [pretrained.py:259] Creating model
2022-03-21 16:02:09,338 INFO [pretrained.py:268] Constructing Fbank computer
2022-03-21 16:02:09,341 INFO [pretrained.py:278] Reading sound files: ['icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W01.wav', 'icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W02.wav', 'icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W03.wav']
2022-03-21 16:02:09,374 INFO [pretrained.py:284] Decoding started
2022-03-21 16:02:09,526 INFO [pretrained.py:304] Using greedy_search
2022-03-21 16:02:10,931 INFO [pretrained.py:332]
icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W01.wav:
choice isn 't it i don 't live there but i did journey on a twenty seven thousand mile trip for two years to the fastest scroing and whiteest counties in america what is a whitopia i define whitopia in three ways first whitopia has posted at least six percent

icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W02.wav:
population growth since two thousand secondly the majority of that growth comes from white migrants and third the whitopia has an ineffable charm a pleasant look and feel a genose clas to learn how and why whitopias are ticking i immerse myself for several months apiece in three of them first

icefall_asr_tedlium3_transducer_stateless/test_wavs/RichBenjamin_2015W03.wav:
st george utah second queur d 'alne idaho and third forcie county georgia first stop st george a beautiful town of red rock landscapes in the one thousand eight hundred and fifty 's brigham young dispatched families to st george to grow cotton because of the hot arid climate and so they called it utah 's dixie and the name sticks to this day


2022-03-21 16:02:10,931 INFO [pretrained.py:334] Decoding Done
```