# Need help on wav2vec 2.0 models training
**URL:**
**Author:**  [@Krawist](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2FKrawist)%5C
**Post date:** [July 31, 2021, 5:55pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fneed-help-on-wav2vec-2-0-models-training%2F8880%2F1 "2021-07-31T17:55:19Z")
Hello guys, I’m using transformers library and I want to build speech recognition systems base on wav2vec 2.0
I have different problems
1. Base on the exemple here [Wav2Vec2 — transformers 4.7.0 documentation](https://huggingface.co/transformers/master/model_doc/wav2vec2.html#wav2vec2forpretraining)
I have tried to pretrain a model. But I have seen in the github on fairseq wav2vec that the loss object at the end, I can call a backward method on, but here I can.
2. how can I perform batch training in wav2vec.
Guys please I need help, even another documentation or examples.
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**Author:**  [@ahmedlone123](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2Fahmedlone123)%5C
**Post date:** [July 31, 2021, 6:06pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fneed-help-on-wav2vec-2-0-models-training%2F8880%2F2 "2021-07-31T18:06:04Z")
[https://github.com/huggingface/blog/blob/master/fine-tune-wav2vec2-english.md](https://github.com/huggingface/blog/blob/master/fine-tune-wav2vec2-english.md)
try this
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**Author:**  [@Krawist](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Fu%2FKrawist)%5C
**Post date:** [July 31, 2021, 6:26pm UTC](/static-proxy?url=https%3A%2F%2Fdiscuss.huggingface.co%2Ft%2Fneed-help-on-wav2vec-2-0-models-training%2F8880%2F3 "2021-07-31T18:26:36Z")
Thanks you