[pytree] add another simplified pytree module `torch.pytree` #148180

XuehaiPan · 2025-02-28T10:51:49Z

Stack from ghstack (oldest at bottom):

Differences between torch.pytree and torch.utils.pytree:

APIs in torch.utils.pytree have a tree_ prefix:

leaves, treespec = torch.utils.pytree.tree_flatten(tree)
new_tree = torch.utils.pytree.tree_map(func, tree)

leaves, treespec = torch.pytree.flatten(tree)
new_tree = torch.pytree.map(func, tree)

This is similar to the JAX pytree API: jax.tree_util.tree_* vs. jax.tree.*.

The argument order of unflatten is reversed for better functools.partial support:

tree = torch.utils.pytree.tree_unflatten(leaves, treespec)

tree = torch.pytree.unflatten(treespec, leaves)

unflatten_fn = functools.partial(torch.pytree.unflatten, treespec)
tree1 = unflatten_fn(leaves1)
tree2 = unflatten_fn(leaves2)

This is also aligned with the JAX pytree API: jax.tree.unflatten(treedef, leaves).

Because we are adding a completely new module, there are no BC issues.

cc @zou3519

[ghstack-poisoned]

pytorch-bot · 2025-02-28T10:51:53Z

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Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: a073729 Pull Request resolved: #148180

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: a073729 Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: e6963b3 Pull Request resolved: #148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 0570acc Pull Request resolved: #148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 2bdd0e3 Pull Request resolved: #148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 0bf5096 Pull Request resolved: #148180

Skylion007 · 2025-02-28T14:54:06Z

torch/pytree.py

+]
+
+
+def unflatten(treespec: PyTreeSpec, leaves: Iterable[_Any]) -> PyTree:


Use a TypeVar to dispatch iterable typing to the stub. No reason to erase the typing info here in case we improve typing in the future.

PyTree is an alias of typing.Any which is not a generic type.

that might change in the futre though. Good to not erase typing if unnecessary and make it flexible to future refactors

vmoens

The change is localized and well documented + motivated, I'm happy with it
Thanks @XuehaiPan

torch/pytree.py

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 9bac8a3 Pull Request resolved: #148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: a88a117 Pull Request resolved: #148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 4fd9651 Pull Request resolved: #148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 0f7a5e7 Pull Request resolved: #148180

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: bab8a42 Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 91cd5c0 Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: bc6b68f Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: c42a1e5 Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 024a983 Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 704b18b Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 70a1538 Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: 7c73c7a Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: e64ef6f Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: ac60aaa Pull Request resolved: pytorch#148180

[ghstack-poisoned]

Differences between `torch.pytree` and `torch.utils.pytree`: 1. APIs in `torch.utils.pytree` have a `tree_` prefix: ```python leaves, treespec = torch.utils.pytree.tree_flatten(tree) new_tree = torch.utils.pytree.tree_map(func, tree) leaevs, treespec = torch.pytree.flatten(tree) new_tree = torch.pytree.map(func, tree) ``` 2. The argument order of `unflatten` is reversed for better `functools.partial` support: ```python tree = torch.utils.pytree.tree_unflatten(leaves, treespec) tree = torch.pytree.unflatten(treespec, leaves) unflatten_fn = functools.partial(torch.pytree.unflatten, treespec) tree1 = unflatten_fn(leaves1) tree2 = unflatten_fn(leaves2) ``` This is also aligned with the JAX pytree API: `jax.tree.unflatten(treedef, leaves)`. ghstack-source-id: acb3131 Pull Request resolved: pytorch#148180

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[pytree] Add public pytree module torch.utils.pytree #137400

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[pytree] add another simplified pytree module `torch.pytree` #148180

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		def unflatten(treespec: PyTreeSpec, leaves: Iterable[_Any]) -> PyTree:

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/148180

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[pytree] add another simplified pytree module `torch.pytree` #148180

[pytree] add another simplified pytree module `torch.pytree` #148180

XuehaiPan commented Feb 28, 2025 •

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pytorch-bot bot commented Feb 28, 2025 •

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