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Blend H3 VAE tiles against composited neighbours (#16436)

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Jukka Seppänen
2026-09-21 21:56:39 -04:00
committed by GitHub
parent d158420950
commit fc584aaa22
1 changed files with 12 additions and 11 deletions
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comfy/ldm/minimax/vae.py
+12 -11
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@@ -599,38 +599,39 @@ class MiniMaxH3VideoVAE(nn.Module):
y_idx, y_len, y_overlap = self.split_tiles(height)
x_idx, x_len, x_overlap = self.split_tiles(width)
# Blended tiles are written straight into a pre-allocated canvas.
# Blended tiles are written straight into a pre-allocated canvas. Tiles blend against
# their neighbours as already blended, so seams stay continuous where overlaps cross.
canvas = None
row_tails = []
strip = None
out_y = 0
for i, (i_pos, i_len) in enumerate(zip(y_idx, y_len)):
zi, zl = i_pos // self.vae_ratio, i_len // self.vae_ratio
tiles = self._decode_tile_row(z[..., zi:zi + zl, :], x_idx, x_len)
new_tails = []
new_strip = None
left_tail = None
out_x = 0
# enumerate would retain the previous tile while the next batch decodes.
for j in range(len(x_idx)):
tile = next(tiles)
if i < len(y_idx) - 1:
new_tails.append(tile[..., -y_overlap[i]:, :].clone())
next_left_tail = tile[..., :, -x_overlap[j]:].clone() if j < len(x_idx) - 1 else None
if i > 0:
tile = self.blend(row_tails[j], tile, y_overlap[i - 1], dim=-2)
tile = self.blend(strip[..., :, x_idx[j]:x_idx[j] + x_len[j]], tile, y_overlap[i - 1], dim=-2)
if j > 0:
tile = self.blend(left_tail, tile, x_overlap[j - 1], dim=-1)
left_tail = next_left_tail
if i < len(y_idx) - 1:
tile = tile[..., :-y_overlap[i], :]
left_tail = tile[..., :, -x_overlap[j]:].clone() if j < len(x_idx) - 1 else None
if j < len(x_idx) - 1:
tile = tile[..., :, :-x_overlap[j]]
if canvas is None:
canvas = torch.empty(*tile.shape[:-2], height, width, dtype=tile.dtype, device=tile.device)
if i < len(y_idx) - 1:
if new_strip is None:
new_strip = torch.empty(*tile.shape[:-2], y_overlap[i], width, dtype=tile.dtype, device=tile.device)
new_strip[..., :, out_x:out_x + tile.shape[-1]] = tile[..., -y_overlap[i]:, :]
tile = tile[..., :-y_overlap[i], :]
canvas[..., out_y:out_y + tile.shape[-2], out_x:out_x + tile.shape[-1]].copy_(tile)
tile_height = tile.shape[-2]
out_x += tile.shape[-1]
del tile
row_tails = new_tails
strip = new_strip
out_y += tile_height
return canvas