[wenet/utils] add kemans in torch with wenet #2545
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it works ！ aishell 8gpu 
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encode save to file works 
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kobenaxie
reviewed
Jun 13, 2024
| means = distributed_sample_vectors(input, self.num_clusters) | ||
| self.means.copy_(means) | ||
| self.is_initialized = True | ||
| inertia = self._one_step(input.unsqueeze(0)) |
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groups > 1的时候需要对input扩展input.expand(0).expand(self.groups, -1, -1)
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kmeans 是个常用的工具， 这里实现了在wenet的speech model基础上 进行online 提特征
用途：
speech encoder 聚类 离散化id -> LLM 语音理解 （asr等）
hubert/w2vbert 聚类， 离散化 semantic token -> tts 的semantic 等
TODO: