Fix mesh axis bugs & Fix Wan-VACE transformer and pipeline to align with other Wan models and pipeline

* Remove an unnecessary `vae_spatial_axis_name` assignment to `vae_mesh` in `wan_pipeline.py`, that fixes `AttributeError: cannot assign to field 'vae_spatial_axis_name'`.

* Adopts the shared `_create_common_components` method (used by `WanPipeline2_1`, `WanPipeline2_2`, etc.) into `_load_and_init` of `VaceWanPipeline2_1`. This align initialization and resolves mesh axis handling issues during `VaceWanPipeline2_1` initialization introduced by PR #359.

* Adopts new parameters `mask_padding_tokens`, `enable_jax_named_scopes`, `use_base2_exp`, `use_experimental_scheduler` into `transformer_wan_vace.py` and `wan_vace_pipeline_2_1.py` (following `transformer_wan.py` and `wan_pipeline.py` respectively) that resolves attention errors (introduced by PR #359) and align Wan-VACE transformer to Wan transformer.

* Removes the `load_common_components` argument from `from_pretrained` and `from_checkpoint` in `VaeWanPipeline2_1` for interface consistency.

Author: ninatu

src/maxdiffusion/models/wan/transformers/transformer_wan_vace.py

@@ -13,6 +13,7 @@
 limitations under the License.
 """
 
+import contextlib
 import math
 from typing import Any, Dict, Optional, Tuple
 
@@ -62,8 +63,12 @@ def __init__(
       precision: jax.lax.Precision | None = None,
       attention: str = "dot_product",
       dropout: float = 0.0,
+      mask_padding_tokens: bool = True,
+      enable_jax_named_scopes: bool = False,
       apply_input_projection: bool = False,
       apply_output_projection: bool = False,
+      use_base2_exp: bool = False,
+      use_experimental_scheduler: bool = False,
   ):
     """Sets up the model.
 
@@ -90,7 +95,7 @@ def __init__(
       apply_output_projection: Whether to apply an output projection before
         outputting the result.
     """
-
+    self.enable_jax_named_scopes = enable_jax_named_scopes
     self.apply_input_projection = apply_input_projection
     self.apply_output_projection = apply_output_projection
 
@@ -124,7 +129,12 @@ def __init__(
         precision=precision,
         attention_kernel=attention,
         dropout=dropout,
+        is_self_attention=True,
+        mask_padding_tokens=mask_padding_tokens,
         residual_checkpoint_name="self_attn",
+        enable_jax_named_scopes=enable_jax_named_scopes,
+        use_base2_exp=use_base2_exp,
+        use_experimental_scheduler=use_experimental_scheduler,
     )
 
     # 3. Cross-attention
@@ -143,7 +153,12 @@ def __init__(
         precision=precision,
         attention_kernel=attention,
         dropout=dropout,
+        is_self_attention=False,
+        mask_padding_tokens=mask_padding_tokens,
         residual_checkpoint_name="cross_attn",
+        enable_jax_named_scopes=enable_jax_named_scopes,
+        use_base2_exp=use_base2_exp,
+        use_experimental_scheduler=use_experimental_scheduler,
     )
     assert cross_attn_norm is True, "cross_attn_norm must be True"
     self.norm2 = FP32LayerNorm(rngs=rngs, dim=dim, eps=eps, elementwise_affine=True)
@@ -158,6 +173,7 @@ def __init__(
         weights_dtype=weights_dtype,
         precision=precision,
         dropout=dropout,
+        enable_jax_named_scopes=enable_jax_named_scopes,
     )
 
     self.norm3 = FP32LayerNorm(rngs=rngs, dim=dim, eps=eps, elementwise_affine=False)
@@ -180,6 +196,10 @@ def __init__(
         jax.random.normal(key, (1, 6, dim)) / dim**0.5,
     )
 
+  def conditional_named_scope(self, name: str):
+    """Return a JAX named scope if enabled, otherwise a null context."""
+    return jax.named_scope(name) if self.enable_jax_named_scopes else contextlib.nullcontext()
+
   def __call__(
       self,
       *,
@@ -191,65 +211,74 @@ def __call__(
       deterministic: bool = True,
       rngs: nnx.Rngs | None = None,
   ) -> Tuple[jax.Array, jax.Array]:
-    if self.apply_input_projection:
-      control_hidden_states = self.proj_in(control_hidden_states)
-      control_hidden_states = control_hidden_states + hidden_states
-
-    shift_msa, scale_msa, gate_msa, c_shift_msa, c_scale_msa, c_gate_msa = jnp.split(
-        (self.adaln_scale_shift_table + temb.astype(jnp.float32)), 6, axis=1
-    )
-
-    control_hidden_states = jax.lax.with_sharding_constraint(
-        control_hidden_states,
-        PartitionSpec("data", "fsdp", "tensor"),
-    )
-    control_hidden_states = checkpoint_name(control_hidden_states, "control_hidden_states")
-    encoder_hidden_states = jax.lax.with_sharding_constraint(
-        encoder_hidden_states,
-        PartitionSpec("data", "fsdp", None),
-    )
-
-    # 1. Self-attention
-    with jax.named_scope("attn1"):
-      norm_hidden_states = (self.norm1(control_hidden_states.astype(jnp.float32)) * (1 + scale_msa) + shift_msa).astype(
-          control_hidden_states.dtype
+    with self.conditional_named_scope("vace_transformer_block"):
+      with self.conditional_named_scope("input_projection"):
+        if self.apply_input_projection:
+          control_hidden_states = self.proj_in(control_hidden_states)
+          control_hidden_states = control_hidden_states + hidden_states
+
+      shift_msa, scale_msa, gate_msa, c_shift_msa, c_scale_msa, c_gate_msa = jnp.split(
+          (self.adaln_scale_shift_table + temb.astype(jnp.float32)), 6, axis=1
       )
-      attn_output = self.attn1(
-          hidden_states=norm_hidden_states,
-          encoder_hidden_states=norm_hidden_states,
-          rotary_emb=rotary_emb,
-          deterministic=deterministic,
-          rngs=rngs,
-      )
-      control_hidden_states = (control_hidden_states.astype(jnp.float32) + attn_output * gate_msa).astype(
-          control_hidden_states.dtype
-      )
-
-    # 2. Cross-attention
-    with jax.named_scope("attn2"):
-      norm_hidden_states = self.norm2(control_hidden_states.astype(jnp.float32)).astype(control_hidden_states.dtype)
-      attn_output = self.attn2(
-          hidden_states=norm_hidden_states,
-          encoder_hidden_states=encoder_hidden_states,
-          deterministic=deterministic,
-          rngs=rngs,
-      )
-      control_hidden_states = control_hidden_states + attn_output
 
-    # 3. Feed-forward
-    with jax.named_scope("ffn"):
-      norm_hidden_states = (self.norm3(control_hidden_states.astype(jnp.float32)) * (1 + c_scale_msa) + c_shift_msa).astype(
-          control_hidden_states.dtype
-      )
-      ff_output = self.ffn(norm_hidden_states, deterministic=deterministic, rngs=rngs)
-      control_hidden_states = (
-          control_hidden_states.astype(jnp.float32) + ff_output.astype(jnp.float32) * c_gate_msa
-      ).astype(control_hidden_states.dtype)
-      conditioning_states = None
-      if self.apply_output_projection:
-        conditioning_states = self.proj_out(control_hidden_states)
+      axis_names = nn.logical_to_mesh_axes(("activation_batch", "activation_length", "activation_heads"))
+      control_hidden_states = jax.lax.with_sharding_constraint(control_hidden_states, axis_names)
+      control_hidden_states = checkpoint_name(control_hidden_states, "control_hidden_states")
+      axis_names = nn.logical_to_mesh_axes(("activation_batch", "activation_length", "activation_kv"))
+      encoder_hidden_states = jax.lax.with_sharding_constraint(encoder_hidden_states, axis_names)
+
+      # 1. Self-attention
+      with self.conditional_named_scope("self_attn"):
+        with self.conditional_named_scope("self_attn_norm"):
+          norm_hidden_states = (self.norm1(control_hidden_states.astype(jnp.float32)) * (1 + scale_msa) + shift_msa).astype(
+              control_hidden_states.dtype
+          )
+        with self.conditional_named_scope("self_attn_attn"):
+          attn_output = self.attn1(
+              hidden_states=norm_hidden_states,
+              encoder_hidden_states=norm_hidden_states,
+              rotary_emb=rotary_emb,
+              deterministic=deterministic,
+              rngs=rngs,
+          )
+        with self.conditional_named_scope("self_attn_residual"):
+          control_hidden_states = (control_hidden_states.astype(jnp.float32) + attn_output * gate_msa).astype(
+              control_hidden_states.dtype
+          )
 
-    return conditioning_states, control_hidden_states
+      # 2. Cross-attention
+      with self.conditional_named_scope("cross_attn"):
+        with self.conditional_named_scope("cross_attn_norm"):
+          norm_hidden_states = self.norm2(control_hidden_states.astype(jnp.float32)).astype(control_hidden_states.dtype)
+        with self.conditional_named_scope("cross_attn_attn"):
+          attn_output = self.attn2(
+              hidden_states=norm_hidden_states,
+              encoder_hidden_states=encoder_hidden_states,
+              deterministic=deterministic,
+              rngs=rngs,
+          )
+        with self.conditional_named_scope("cross_attn_residual"):
+          control_hidden_states = control_hidden_states + attn_output
+
+      # 3. Feed-forward
+      with self.conditional_named_scope("mlp"):
+        with self.conditional_named_scope("mlp_norm"):
+          norm_hidden_states = (
+              self.norm3(control_hidden_states.astype(jnp.float32)) * (1 + c_scale_msa) + c_shift_msa
+          ).astype(control_hidden_states.dtype)
+        with self.conditional_named_scope("mlp_ffn"):
+          ff_output = self.ffn(norm_hidden_states, deterministic=deterministic, rngs=rngs)
+        with self.conditional_named_scope("mlp_residual"):
+          control_hidden_states = (
+              control_hidden_states.astype(jnp.float32) + ff_output.astype(jnp.float32) * c_gate_msa
+          ).astype(control_hidden_states.dtype)
+
+      with self.conditional_named_scope("output_projection"):
+        conditioning_states = None
+        if self.apply_output_projection:
+          conditioning_states = self.proj_out(control_hidden_states)
+
+      return conditioning_states, control_hidden_states
 
 
 class WanVACEModel(WanModel):
@@ -289,7 +318,11 @@ def __init__(
       remat_policy: str = "None",
       names_which_can_be_saved: list[str] = [],
       names_which_can_be_offloaded: list[str] = [],
+      mask_padding_tokens: bool = True,
       scan_layers: bool = True,
+      enable_jax_named_scopes: bool = False,
+      use_base2_exp: bool = False,
+      use_experimental_scheduler: bool = False,
   ):
     """Initializes the VACE model.
 
@@ -302,6 +335,7 @@ def __init__(
     out_channels = out_channels or in_channels
     self.num_layers = num_layers
     self.scan_layers = scan_layers
+    self.enable_jax_named_scopes = enable_jax_named_scopes
 
     # 1. Patch & position embedding
     self.rope = WanRotaryPosEmbed(attention_head_dim, patch_size, rope_max_seq_len)
@@ -329,6 +363,7 @@ def __init__(
         text_embed_dim=text_dim,
         image_embed_dim=image_dim,
         pos_embed_seq_len=pos_embed_seq_len,
+        flash_min_seq_length=flash_min_seq_length,
     )
 
     self.gradient_checkpoint = GradientCheckpointType.from_str(remat_policy)
@@ -358,6 +393,10 @@ def __init__(
             precision=precision,
             attention=attention,
             dropout=dropout,
+            mask_padding_tokens=mask_padding_tokens,
+            enable_jax_named_scopes=enable_jax_named_scopes,
+            use_base2_exp=use_base2_exp,
+            use_experimental_scheduler=use_experimental_scheduler,
         )
         blocks.append(block)
       self.blocks = blocks
@@ -384,8 +423,12 @@ def __init__(
             precision=precision,
             attention=attention,
             dropout=dropout,
+            mask_padding_tokens=mask_padding_tokens,
+            enable_jax_named_scopes=enable_jax_named_scopes,
             apply_input_projection=vace_block_id == 0,
             apply_output_projection=True,
+            use_base2_exp=use_base2_exp,
+            use_experimental_scheduler=use_experimental_scheduler,
         )
         vace_blocks.append(vace_block)
       self.vace_blocks = vace_blocks
@@ -421,6 +464,10 @@ def __init__(
         kernel_init=nnx.with_partitioning(nnx.initializers.xavier_uniform(), (None, None, "embed")),
     )
 
+  def conditional_named_scope(self, name: str):
+    """Return a JAX named scope if enabled, otherwise a null context."""
+    return jax.named_scope(name) if self.enable_jax_named_scopes else contextlib.nullcontext()
+
   @jax.named_scope("WanVACEModel")
   def __call__(
       self,
@@ -436,7 +483,7 @@ def __call__(
       rngs: nnx.Rngs = None,
   ) -> jax.Array:
     hidden_states = nn.with_logical_constraint(hidden_states, ("batch", None, None, None, None))
-    batch_size, num_channels, num_frames, height, width = hidden_states.shape
+    batch_size, _, num_frames, height, width = hidden_states.shape
     p_t, p_h, p_w = self.config.patch_size
     post_patch_num_frames = num_frames // p_t
     post_patch_height = height // p_h
@@ -453,13 +500,14 @@ def __call__(
 
     hidden_states = jnp.transpose(hidden_states, (0, 2, 3, 4, 1))
     control_hidden_states = jnp.transpose(control_hidden_states, (0, 2, 3, 4, 1))
-    rotary_emb = self.rope(hidden_states)
-
-    hidden_states = self.patch_embedding(hidden_states)
-    hidden_states = jax.lax.collapse(hidden_states, 1, -1)
-
-    control_hidden_states = self.vace_patch_embedding(control_hidden_states)
-    control_hidden_states = jax.lax.collapse(control_hidden_states, 1, -1)
+    with self.conditional_named_scope("rotary_embedding"):
+      rotary_emb = self.rope(hidden_states)
+    with self.conditional_named_scope("patch_embedding"):
+      hidden_states = self.patch_embedding(hidden_states)
+      hidden_states = jax.lax.collapse(hidden_states, 1, -1)
+
+      control_hidden_states = self.vace_patch_embedding(control_hidden_states)
+      control_hidden_states = jax.lax.collapse(control_hidden_states, 1, -1)
     control_hidden_states_padding = jnp.zeros((
         batch_size,
         control_hidden_states.shape[1],
@@ -469,16 +517,17 @@ def __call__(
     control_hidden_states = jnp.concatenate([control_hidden_states, control_hidden_states_padding], axis=2)
 
     # Condition embedder is a FC layer.
-    (
-        temb,
-        timestep_proj,
-        encoder_hidden_states,
-        encoder_hidden_states_image,
-        _,
-    ) = self.condition_embedder(  # We will need to mask out the text embedding.
-        timestep, encoder_hidden_states, encoder_hidden_states_image
-    )
-    timestep_proj = timestep_proj.reshape(timestep_proj.shape[0], 6, -1)
+    with self.conditional_named_scope("condition_embedder"):
+      (
+          temb,
+          timestep_proj,
+          encoder_hidden_states,
+          encoder_hidden_states_image,
+          _,
+      ) = self.condition_embedder(  # We will need to mask out the text embedding.
+          timestep, encoder_hidden_states, encoder_hidden_states_image
+      )
+      timestep_proj = timestep_proj.reshape(timestep_proj.shape[0], 6, -1)
 
     if encoder_hidden_states_image is not None:
       raise NotImplementedError("img2vid is not yet implemented.")

src/maxdiffusion/pipelines/wan/wan_pipeline.py

@@ -630,7 +630,6 @@ def _create_common_components(cls, config, vae_only=False, i2v=False):
     vae_devices_array = flat_devices.reshape(total_devices // vae_spatial, vae_spatial)
 
     vae_mesh = Mesh(vae_devices_array, ("redundant", "vae_spatial"))
-    vae_mesh.vae_spatial_axis_name = "vae_spatial"
     max_logging.log(
         f"Created VAE specific mesh with axes ('redundant', 'vae_spatial') to support spatial sharding of {vae_spatial}."
     )