fix issue in zipformer.py #349
| Job | Run time |
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| 4s | |
| 41m 4s | |
| 40m 47s | |
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| 40m 20s | |
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| 31m 13s | |
| 34m 18s | |
| 34m 52s | |
| 34m 41s | |
| 35m 35s | |
| 33m 27s | |
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| 33m 18s | |
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| 32m 19s | |
| 35m 38s | |
| 33m 23s | |
| 33m 27s | |
| 32m 47s | |
| 31m 52s | |
| 34m 5s | |
| 32m 19s | |
| 19h 31m 5s |