Support the LTXAV 2.3 model. (Comfy-Org#12773)

Author: comfyanonymous

comfy/ldm/lightricks/av_model.py

@@ -50,6 +50,7 @@ def __init__(
         d_head,
         context_dim=None,
         attn_precision=None,
+        apply_gated_attention=False,
         dtype=None,
         device=None,
         operations=None,
@@ -63,6 +64,7 @@ def __init__(
             heads=n_heads,
             dim_head=d_head,
             context_dim=None,
+            apply_gated_attention=apply_gated_attention,
             dtype=dtype,
             device=device,
             operations=operations,
@@ -121,6 +123,7 @@ def __init__(
         positional_embedding_max_pos=[4096],
         causal_temporal_positioning=False,
         num_learnable_registers: Optional[int] = 128,
+        apply_gated_attention=False,
         dtype=None,
         device=None,
         operations=None,
@@ -145,6 +148,7 @@ def __init__(
                     num_attention_heads,
                     attention_head_dim,
                     context_dim=cross_attention_dim,
+                    apply_gated_attention=apply_gated_attention,
                     dtype=dtype,
                     device=device,
                     operations=operations,

comfy/ldm/lightricks/embeddings_connector.py

@@ -13,7 +13,7 @@
     CausalityAxis,
     CausalAudioAutoencoder,
 )
-from comfy.ldm.lightricks.vocoders.vocoder import Vocoder
+from comfy.ldm.lightricks.vocoders.vocoder import Vocoder, VocoderWithBWE
 
 LATENT_DOWNSAMPLE_FACTOR = 4
 
@@ -141,7 +141,10 @@ def __init__(self, state_dict: dict, metadata: dict):
         vocoder_sd = utils.state_dict_prefix_replace(state_dict, {"vocoder.": ""}, filter_keys=True)
 
         self.autoencoder = CausalAudioAutoencoder(config=component_config.autoencoder)
-        self.vocoder = Vocoder(config=component_config.vocoder)
+        if "bwe" in component_config.vocoder:
+            self.vocoder = VocoderWithBWE(config=component_config.vocoder)
+        else:
+            self.vocoder = Vocoder(config=component_config.vocoder)
 
         self.autoencoder.load_state_dict(vae_sd, strict=False)
         self.vocoder.load_state_dict(vocoder_sd, strict=False)

comfy/ldm/lightricks/model.py

@@ -822,26 +822,23 @@ def __init__(self, config=None):
         super().__init__()
 
         if config is None:
-            config = self._guess_config()
+            config = self.get_default_config()
 
-        # Extract encoder and decoder configs from the new format
         model_config = config.get("model", {}).get("params", {})
-        variables_config = config.get("variables", {})
 
-        self.sampling_rate = variables_config.get(
-            "sampling_rate",
-            model_config.get("sampling_rate", config.get("sampling_rate", 16000)),
+        self.sampling_rate = model_config.get(
+            "sampling_rate", config.get("sampling_rate", 16000)
         )
         encoder_config = model_config.get("encoder", model_config.get("ddconfig", {}))
         decoder_config = model_config.get("decoder", encoder_config)
 
         # Load mel spectrogram parameters
         self.mel_bins = encoder_config.get("mel_bins", 64)
-        self.mel_hop_length = model_config.get("preprocessing", {}).get("stft", {}).get("hop_length", 160)
-        self.n_fft = model_config.get("preprocessing", {}).get("stft", {}).get("filter_length", 1024)
+        self.mel_hop_length = config.get("preprocessing", {}).get("stft", {}).get("hop_length", 160)
+        self.n_fft = config.get("preprocessing", {}).get("stft", {}).get("filter_length", 1024)
 
         # Store causality configuration at VAE level (not just in encoder internals)
-        causality_axis_value = encoder_config.get("causality_axis", CausalityAxis.WIDTH.value)
+        causality_axis_value = encoder_config.get("causality_axis", CausalityAxis.HEIGHT.value)
         self.causality_axis = CausalityAxis.str_to_enum(causality_axis_value)
         self.is_causal = self.causality_axis == CausalityAxis.HEIGHT
 
@@ -850,44 +847,38 @@ def __init__(self, config=None):
 
         self.per_channel_statistics = processor()
 
-    def _guess_config(self):
-        encoder_config = {
-            # Required parameters - based on ltx-video-av-1679000 model metadata
+    def get_default_config(self):
+        ddconfig = {
+            "double_z": True,
+            "mel_bins": 64,
+            "z_channels": 8,
+            "resolution": 256,
+            "downsample_time": False,
+            "in_channels": 2,
+            "out_ch": 2,
             "ch": 128,
-            "out_ch": 8,
-            "ch_mult": [1, 2, 4],  # Based on metadata: [1, 2, 4] not [1, 2, 4, 8]
+            "ch_mult": [1, 2, 4],
             "num_res_blocks": 2,
-            "attn_resolutions": [],  # Based on metadata: empty list, no attention
+            "attn_resolutions": [],
             "dropout": 0.0,
-            "resamp_with_conv": True,
-            "in_channels": 2,  # stereo
-            "resolution": 256,
-            "z_channels": 8,
-            "double_z": True,
-            "attn_type": "vanilla",
-            "mid_block_add_attention": False,  # Based on metadata: false
+            "mid_block_add_attention": False,
             "norm_type": "pixel",
-            "causality_axis": "height",  # Based on metadata
-            "mel_bins": 64,  # Based on metadata: mel_bins = 64
-        }
-
-        decoder_config = {
-            # Inherits encoder config, can override specific params
-            **encoder_config,
-            "out_ch": 2,  # Stereo audio output (2 channels)
-            "give_pre_end": False,
-            "tanh_out": False,
+            "causality_axis": "height",
         }
 
         config = {
-            "_class_name": "CausalAudioAutoencoder",
-            "sampling_rate": 16000,
             "model": {
                 "params": {
-                    "encoder": encoder_config,
-                    "decoder": decoder_config,
+                    "ddconfig": ddconfig,
+                    "sampling_rate": 16000,
                 }
             },
+            "preprocessing": {
+                "stft": {
+                    "filter_length": 1024,
+                    "hop_length": 160,
+                },
+            },
         }
 
         return config

comfy/ldm/lightricks/vae/audio_vae.py

@@ -15,6 +15,9 @@
 
 ops = comfy.ops.disable_weight_init
 
+def in_meta_context():
+    return torch.device("meta") == torch.empty(0).device
+
 def mark_conv3d_ended(module):
     tid = threading.get_ident()
     for _, m in module.named_modules():
@@ -350,6 +353,10 @@ def __init__(
                 output_channel = output_channel * block_params.get("multiplier", 2)
             if block_name == "compress_all":
                 output_channel = output_channel * block_params.get("multiplier", 1)
+            if block_name == "compress_space":
+                output_channel = output_channel * block_params.get("multiplier", 1)
+            if block_name == "compress_time":
+                output_channel = output_channel * block_params.get("multiplier", 1)
 
         self.conv_in = make_conv_nd(
             dims,
@@ -395,17 +402,21 @@ def __init__(
                     spatial_padding_mode=spatial_padding_mode,
                 )
             elif block_name == "compress_time":
+                output_channel = output_channel // block_params.get("multiplier", 1)
                 block = DepthToSpaceUpsample(
                     dims=dims,
                     in_channels=input_channel,
                     stride=(2, 1, 1),
+                    out_channels_reduction_factor=block_params.get("multiplier", 1),
                     spatial_padding_mode=spatial_padding_mode,
                 )
             elif block_name == "compress_space":
+                output_channel = output_channel // block_params.get("multiplier", 1)
                 block = DepthToSpaceUpsample(
                     dims=dims,
                     in_channels=input_channel,
                     stride=(1, 2, 2),
+                    out_channels_reduction_factor=block_params.get("multiplier", 1),
                     spatial_padding_mode=spatial_padding_mode,
                 )
             elif block_name == "compress_all":
@@ -455,6 +466,15 @@ def __init__(
                 output_channel * 2, 0, operations=ops,
             )
             self.last_scale_shift_table = nn.Parameter(torch.empty(2, output_channel))
+        else:
+            self.register_buffer(
+                "last_scale_shift_table",
+                torch.tensor(
+                    [0.0, 0.0],
+                    device="cpu" if in_meta_context() else None
+                ).unsqueeze(1).expand(2, output_channel),
+                persistent=False,
+            )
 
 
     # def forward(self, sample: torch.FloatTensor, target_shape) -> torch.FloatTensor:
@@ -883,6 +903,15 @@ def __init__(
             self.scale_shift_table = nn.Parameter(
                 torch.randn(4, in_channels) / in_channels**0.5
             )
+        else:
+            self.register_buffer(
+                "scale_shift_table",
+                torch.tensor(
+                    [0.0, 0.0, 0.0, 0.0],
+                    device="cpu" if in_meta_context() else None
+                ).unsqueeze(1).expand(4, in_channels),
+                persistent=False,
+            )
 
         self.temporal_cache_state={}
 
@@ -1012,9 +1041,6 @@ def __init__(self):
         super().__init__()
         self.register_buffer("std-of-means", torch.empty(128))
         self.register_buffer("mean-of-means", torch.empty(128))
-        self.register_buffer("mean-of-stds", torch.empty(128))
-        self.register_buffer("mean-of-stds_over_std-of-means", torch.empty(128))
-        self.register_buffer("channel", torch.empty(128))
 
     def un_normalize(self, x):
         return (x * self.get_buffer("std-of-means").view(1, -1, 1, 1, 1).to(x)) + self.get_buffer("mean-of-means").view(1, -1, 1, 1, 1).to(x)
@@ -1027,9 +1053,12 @@ def __init__(self, version=0, config=None):
         super().__init__()
 
         if config is None:
-            config = self.guess_config(version)
+            config = self.get_default_config(version)
 
+        self.config = config
         self.timestep_conditioning = config.get("timestep_conditioning", False)
+        self.decode_noise_scale = config.get("decode_noise_scale", 0.025)
+        self.decode_timestep = config.get("decode_timestep", 0.05)
         double_z = config.get("double_z", True)
         latent_log_var = config.get(
             "latent_log_var", "per_channel" if double_z else "none"
@@ -1044,13 +1073,15 @@ def __init__(self, version=0, config=None):
             latent_log_var=latent_log_var,
             norm_layer=config.get("norm_layer", "group_norm"),
             spatial_padding_mode=config.get("spatial_padding_mode", "zeros"),
+            base_channels=config.get("encoder_base_channels", 128),
         )
 
         self.decoder = Decoder(
             dims=config["dims"],
             in_channels=config["latent_channels"],
             out_channels=config.get("out_channels", 3),
             blocks=config.get("decoder_blocks", config.get("decoder_blocks", config.get("blocks"))),
+            base_channels=config.get("decoder_base_channels", 128),
             patch_size=config.get("patch_size", 1),
             norm_layer=config.get("norm_layer", "group_norm"),
             causal=config.get("causal_decoder", False),
@@ -1060,7 +1091,7 @@ def __init__(self, version=0, config=None):
 
         self.per_channel_statistics = processor()
 
-    def guess_config(self, version):
+    def get_default_config(self, version):
         if version == 0:
             config = {
                 "_class_name": "CausalVideoAutoencoder",
@@ -1167,8 +1198,7 @@ def encode(self, x):
         means, logvar = torch.chunk(self.encoder(x), 2, dim=1)
         return self.per_channel_statistics.normalize(means)
 
-    def decode(self, x, timestep=0.05, noise_scale=0.025):
+    def decode(self, x):
         if self.timestep_conditioning: #TODO: seed
-            x = torch.randn_like(x) * noise_scale + (1.0 - noise_scale) * x
-        return self.decoder(self.per_channel_statistics.un_normalize(x), timestep=timestep)
-
+            x = torch.randn_like(x) * self.decode_noise_scale + (1.0 - self.decode_noise_scale) * x
+        return self.decoder(self.per_channel_statistics.un_normalize(x), timestep=self.decode_timestep)