support GQA and realize flash attention v2 with Causal masking #10
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This PR implements GQA for flash attention. and implements flash attention v2 with Causal masking
I got these results on my RTX 1650 (flash attention v2)with
batch_size = 16
n_q_head = 16
n_kv_head = 8
seq_len = 256
head_embd = 64