How to Contribute Code

General

For general improvements/bug fixes just make a pull request. Try to make a single pull request for each change to make reviewing easier.

Special Cases

Adding support for new models

If you want us to add support for a new model to ComfyUI what we need is:

• Have a minimal implementation of the model code that only depends on pytorch under a license compatible with the GPL license that ComfyUI uses.
• Provide a reference image with sampling settings/seed/etc.. so that I can make sure the ComfyUI implementation matches the reference one.
• Replace all attention functions with the comfyui "optimized_attention" attention function
• If possible, please release your primary models in .safetensor file format.

Example of the sdpa implementation:

def optimized_attention(q, k, v, heads, mask=None, attn_precision=None, skip_reshape=False):
    if skip_reshape:
        b, _, _, dim_head = q.shape
    else:
        b, _, dim_head = q.shape
        dim_head //= heads
        q, k, v = map(
            lambda t: t.view(b, -1, heads, dim_head).transpose(1, 2),
            (q, k, v),
        )

    out = torch.nn.functional.scaled_dot_product_attention(q, k, v, attn_mask=mask, dropout_p=0.0, is_causal=False)
    out = (
        out.transpose(1, 2).reshape(b, -1, heads * dim_head)
    )
    return out

Examples in the Code:

Audio

SDXL Cascade

mmdit

After that you can just ping me: "comfyanonymous" on matrix or "comfy" on discord and I can take a look.