Reset IO for the multiple iters output accurancy #9412
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Summary:
if I don't reset_io same as shiftpointer, the multi-iters send output will be incorrect
Example for error
<|begin_of_text|><|start_header_id|>user<|end_header_id|>
what is 1+1<|eot_id|><|start_header_id|>assistant<|end_header_id|>
1 + 1 = 1 + 1 = 2<|eot_id|><|begin_of_text|><|start_header_id|>user<|end_header_id|>
what is 1+1<|eot_id|><|start_header_id|>assistant<|end_header_id|>
briefly!
after the below diff
<|begin_of_text|><|start_header_id|>user<|end_header_id|>
what is 1+1<|eot_id|><|start_header_id|>assistant<|end_header_id|>
1 + 1 = 1 + 1 = 2<|eot_id|><|begin_of_text|><|start_header_id|>user<|end_header_id|>
what is 1+1<|eot_id|><|start_header_id|>assistant<|end_header_id|>
1 + 1 = 1 + 1 = 2<|eot_id|><|begin_of_text|><|start_header_id|>user<|end_header_id|>
Differential Revision: D71492510