[bug_fix] kv_channels is used when available

[arendu]

Signed-off-by: arendu adithya.r@gmail.com

What does this PR do ?

IA3 logic should look at kv_channels * num_attention_heads to get the true hidden_size for k,v,q in ParallelAttention.

Collection: [nlp]

Changelog

• checks if kv_channels is available in the config of a T5 model, if available it will use it and ignore hidden_size.

Usage

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