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# AnyFlowTransformer3DModel

The bidirectional 3D Transformer used by [`AnyFlowPipeline`](../pipelines/anyflow#anyflowpipeline). It is the
v0.35.1 Wan2.1 backbone with one structural change: the timestep embedder is replaced by
``AnyFlowDualTimestepTextImageEmbedding``, so every forward call conditions on both the source timestep
``t`` and the target timestep ``r``. This is the embedding required to learn the flow map
$\Phi_{r\leftarrow t}$ introduced in
[AnyFlow](https://huggingface.co/papers/2605.13724). See the [`AnyFlowPipeline`](../pipelines/anyflow) page
for paper, authors, and released checkpoints.

For chunk-wise autoregressive (FAR causal) generation, use
[`AnyFlowFARTransformer3DModel`](anyflow_far_transformer3d) instead.

```python
from diffusers import AnyFlowTransformer3DModel

# Bidirectional AnyFlow checkpoint (T2V):
transformer = AnyFlowTransformer3DModel.from_pretrained(
    "nvidia/AnyFlow-Wan2.1-T2V-1.3B-Diffusers", subfolder="transformer"
)
```

## AnyFlowTransformer3DModel

[[autodoc]] AnyFlowTransformer3DModel