autoencoder_dc tiling

src/diffusers/models/autoencoders/autoencoder_dc.py

@@ -479,12 +479,15 @@ def __init__(
         self.use_tiling = False
 
         # The minimal tile height and width for spatial tiling to be used
-        self.tile_sample_min_height = 512
-        self.tile_sample_min_width = 512
+        self.tile_sample_min_height = 1024
+        self.tile_sample_min_width = 1024
 
         # The minimal distance between two spatial tiles
-        self.tile_sample_stride_height = 448
-        self.tile_sample_stride_width = 448
+        self.tile_sample_stride_height = 896
+        self.tile_sample_stride_width = 896
+
+        self.tile_latent_min_height = self.tile_sample_min_height // self.spatial_compression_ratio
+        self.tile_latent_min_width = self.tile_sample_min_width // self.spatial_compression_ratio
 
     def enable_tiling(
         self,
@@ -515,6 +518,8 @@ def enable_tiling(
         self.tile_sample_min_width = tile_sample_min_width or self.tile_sample_min_width
         self.tile_sample_stride_height = tile_sample_stride_height or self.tile_sample_stride_height
         self.tile_sample_stride_width = tile_sample_stride_width or self.tile_sample_stride_width
+        self.tile_latent_min_height = self.tile_sample_min_height // self.spatial_compression_ratio
+        self.tile_latent_min_width = self.tile_sample_min_width // self.spatial_compression_ratio
 
     def disable_tiling(self) -> None:
         r"""
@@ -606,11 +611,101 @@ def decode(self, z: torch.Tensor, return_dict: bool = True) -> Union[DecoderOutp
             return (decoded,)
         return DecoderOutput(sample=decoded)
 
+    def blend_v(self, a: torch.Tensor, b: torch.Tensor, blend_extent: int) -> torch.Tensor:
+        blend_extent = min(a.shape[2], b.shape[2], blend_extent)
+        for y in range(blend_extent):
+            b[:, :, y, :] = a[:, :, -blend_extent + y, :] * (1 - y / blend_extent) + b[:, :, y, :] * (y / blend_extent)
+        return b
+
+    def blend_h(self, a: torch.Tensor, b: torch.Tensor, blend_extent: int) -> torch.Tensor:
+        blend_extent = min(a.shape[3], b.shape[3], blend_extent)
+        for x in range(blend_extent):
+            b[:, :, :, x] = a[:, :, :, -blend_extent + x] * (1 - x / blend_extent) + b[:, :, :, x] * (x / blend_extent)
+        return b
+
     def tiled_encode(self, x: torch.Tensor, return_dict: bool = True) -> torch.Tensor:
-        raise NotImplementedError("`tiled_encode` has not been implemented for AutoencoderDC.")
+        batch_size, num_channels, height, width = x.shape
+        latent_height = height // self.spatial_compression_ratio
+        latent_width = width // self.spatial_compression_ratio
+
+        tile_latent_min_height = self.tile_sample_min_height // self.spatial_compression_ratio
+        tile_latent_min_width = self.tile_sample_min_width // self.spatial_compression_ratio
+        tile_latent_stride_height = self.tile_sample_stride_height // self.spatial_compression_ratio
+        tile_latent_stride_width = self.tile_sample_stride_width // self.spatial_compression_ratio
+        blend_height = tile_latent_min_height - tile_latent_stride_height
+        blend_width = tile_latent_min_width - tile_latent_stride_width
+
+        # Split x into overlapping tiles and encode them separately.
+        # The tiles have an overlap to avoid seams between tiles.
+        rows = []
+        for i in range(0, x.shape[2], self.tile_sample_stride_height):
+            row = []
+            for j in range(0, x.shape[3], self.tile_sample_stride_width):
+                tile = x[:, :, i : i + self.tile_sample_min_height, j : j + self.tile_sample_min_width]
+                if tile.shape[2] % self.spatial_compression_ratio != 0 or tile.shape[3] % self.spatial_compression_ratio != 0:
+                    tile = F.pad(tile, (0, (self.spatial_compression_ratio - tile.shape[3]) % self.spatial_compression_ratio, 0, (self.spatial_compression_ratio - tile.shape[2]) % self.spatial_compression_ratio))
+                tile = self.encoder(tile)
+                row.append(tile)
+            rows.append(row)
+        result_rows = []
+        for i, row in enumerate(rows):
+            result_row = []
+            for j, tile in enumerate(row):
+                # blend the above tile and the left tile
+                # to the current tile and add the current tile to the result row
+                if i > 0:
+                    tile = self.blend_v(rows[i - 1][j], tile, blend_height)
+                if j > 0:
+                    tile = self.blend_h(row[j - 1], tile, blend_width)
+                result_row.append(tile[:, :, :tile_latent_stride_height, :tile_latent_stride_width])
+            result_rows.append(torch.cat(result_row, dim=3))
+
+        encoded = torch.cat(result_rows, dim=2)[:, :, :latent_height, :latent_width]
+
+        if not return_dict:
+            return (encoded,)
+        return EncoderOutput(latent=encoded)
 
     def tiled_decode(self, z: torch.Tensor, return_dict: bool = True) -> Union[DecoderOutput, torch.Tensor]:
-        raise NotImplementedError("`tiled_decode` has not been implemented for AutoencoderDC.")
+        batch_size, num_channels, height, width = z.shape
+
+        tile_latent_min_height = self.tile_sample_min_height // self.spatial_compression_ratio
+        tile_latent_min_width = self.tile_sample_min_width // self.spatial_compression_ratio
+        tile_latent_stride_height = self.tile_sample_stride_height // self.spatial_compression_ratio
+        tile_latent_stride_width = self.tile_sample_stride_width // self.spatial_compression_ratio
+
+        blend_height = self.tile_sample_min_height - self.tile_sample_stride_height
+        blend_width = self.tile_sample_min_width - self.tile_sample_stride_width
+
+        # Split z into overlapping tiles and decode them separately.
+        # The tiles have an overlap to avoid seams between tiles.
+        rows = []
+        for i in range(0, height, tile_latent_stride_height):
+            row = []
+            for j in range(0, width, tile_latent_stride_width):
+                tile = z[:, :, i : i + tile_latent_min_height, j : j + tile_latent_min_width]
+                decoded = self.decoder(tile)
+                row.append(decoded)
+            rows.append(row)
+
+        result_rows = []
+        for i, row in enumerate(rows):
+            result_row = []
+            for j, tile in enumerate(row):
+                # blend the above tile and the left tile
+                # to the current tile and add the current tile to the result row
+                if i > 0:
+                    tile = self.blend_v(rows[i - 1][j], tile, blend_height)
+                if j > 0:
+                    tile = self.blend_h(row[j - 1], tile, blend_width)
+                result_row.append(tile[:, :, : self.tile_sample_stride_height, : self.tile_sample_stride_width])
+            result_rows.append(torch.cat(result_row, dim=3))
+
+        decoded = torch.cat(result_rows, dim=2)
+
+        if not return_dict:
+            return (decoded,)
+        return DecoderOutput(sample=decoded)
 
     def forward(self, sample: torch.Tensor, return_dict: bool = True) -> torch.Tensor:
         encoded = self.encode(sample, return_dict=False)[0]