add splitk as a post op #375
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Add splitk as a post op for gemm
q=self.q_proj(hidden_states).view(-1,self.num_local_heads,self.qk_head_dim)
q.split([self.qk_nope_head_dim,·self.qk_rope_head_dim],dim=-1)
In the case of MLA shape, the splitk dimension is M=512, N=24576, K=1536, NUM_HEAD=128, NOPE_DIM=128, ROPE_DIM=64
y=xwT (512x1536 24576x1536)
y=y.reshape(512, 128, 192)
y_nope, y_rope=y.splitk(128,64)
y_nope (512x128x128)
y_rope (512x128x64)