Compute size of buffer required to fit q_proj @ k_proj.T attention scores
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| float_width=2 # float16 | |
| cond_count=2 # uncond and cond for 1 sample | |
| attn_heads=8 # SD1.5 isn't optimized for flash attn, so all layers have 8 heads, lol | |
| vae_scale_factor=8 | |
| px_height=px_width=768 | |
| latent_height=px_height/vae_scale_factor | |
| latent_width=px_width/vae_scale_factor | |
| q_proj_tokens=k_proj_tokens=latent_height*latent_width | |
| qk_bytes = cond_count*attn_heads*float_width*q_proj_tokens*k_proj_tokens | |
| qk_mb = qk_bytes/1024**2 |
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