StyleFeatureEditor

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import torch
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def edit(latents, pca, edit_directions):
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    edit_latents = []
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    for latent in latents:
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        for pca_idx, start, end, strength in edit_directions:
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            delta = get_delta(pca, latent, pca_idx, strength)
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            delta_padded = torch.zeros(latent.shape).to("cuda")
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            delta_padded[start:end] += delta.repeat(end - start, 1)
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            edit_latents.append(latent + delta_padded)
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    return torch.stack(edit_latents)
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def get_delta(pca, latent, idx, strength):
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    w_centered = latent - pca["mean"].to("cuda")
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    lat_comp = pca["comp"].to("cuda")
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    lat_std = pca["std"].to("cuda")
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    w_coord = (
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        torch.sum(w_centered[0].reshape(-1) * lat_comp[idx].reshape(-1)) / lat_std[idx]
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    )
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    delta = (strength - w_coord) * lat_comp[idx] * lat_std[idx]
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    return delta
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def edit_latent(latent, pca, edit_direction):
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    pca_idx, start, end, strength = edit_direction
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    delta = get_delta(pca, latent, pca_idx, strength)
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    delta_padded = torch.zeros(latent.shape).to("cuda")
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    delta_padded[start:end] += delta.repeat(end - start, 1)
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    edit_latent = latent + delta_padded
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    return edit_latent
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