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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| import abc | ||
| import typing as tp | ||
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| import jax | ||
| from jax._src.tree_util import broadcast_prefix | ||
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| from flax import struct | ||
| from flax.nnx.nnx.state import State | ||
| from flax.typing import PathParts | ||
| from flax.nnx.nnx import graph | ||
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| class Missing: | ||
| pass | ||
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| MISSING = Missing() | ||
| A = tp.TypeVar('A') | ||
| E = tp.TypeVar('E', bound='Extractable') | ||
| Index = int | ||
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| class Extractable(abc.ABC): | ||
| @property | ||
| @abc.abstractmethod | ||
| def index(self) -> Index: ... | ||
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| class ExtractableStates(Extractable): | ||
| @property | ||
| @abc.abstractmethod | ||
| def states(self) -> tp.Iterable[State]: ... | ||
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| @property | ||
| @abc.abstractmethod | ||
| def graphdef(self) -> graph.GraphDef[tp.Any]: ... | ||
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| class ExtractionIndex(struct.PyTreeNode, Extractable): | ||
| """Index of a graph node in a Pytree structure.""" | ||
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| _index: Index = struct.field(pytree_node=False) | ||
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| @property | ||
| def index(self) -> Index: | ||
| return self._index | ||
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| @tp.overload | ||
| def extract_graph_nodes(pytree: A, /) -> tuple[A, tuple[tp.Any, ...]]: ... | ||
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| @tp.overload | ||
| def extract_graph_nodes( | ||
| pytree: A, /, *, prefix: tp.Any | ||
| ) -> tuple[A, tuple[tp.Any, ...], tuple[tp.Any, ...]]: ... | ||
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| def extract_graph_nodes( | ||
| pytree: A, /, *, prefix: tp.Any = MISSING | ||
| ) -> ( | ||
| tuple[A, tuple[tp.Any, ...]] | ||
| | tuple[A, tuple[tp.Any, ...], tuple[tp.Any, ...]] | ||
| ): | ||
| """Extracts all graph nodes from a pytree.""" | ||
| nodes = graph.RefMap[tp.Any, Index]() | ||
| node_prefixes = [] | ||
| leaves = [] | ||
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| prefix_leaves = broadcast_prefix( | ||
| prefix, | ||
| pytree, | ||
| is_leaf=lambda x: x is None, | ||
| ) | ||
| key_leaves, treedef = jax.tree_util.tree_flatten_with_path(pytree) | ||
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| assert len(key_leaves) == len(prefix_leaves) | ||
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| for (keypath, leaf), prefix_leaf in zip(key_leaves, prefix_leaves): | ||
| if graph.is_graph_node(leaf): | ||
| if leaf not in nodes: | ||
| index = nodes[leaf] = len(nodes) | ||
| node_prefixes.append(prefix_leaf) | ||
| else: | ||
| index = nodes[leaf] | ||
| # check consistent aliasing | ||
| if prefix_leaf != node_prefixes[index]: | ||
| path_str = jax.tree_util.keystr(keypath) | ||
| raise ValueError( | ||
| f'Inconsistent aliasing detected. Node {type(leaf)} at path {path_str} ' | ||
| f'has different prefixes: {prefix_leaf} and {node_prefixes[index]}.' | ||
| ) | ||
| leaves.append(ExtractionIndex(index)) | ||
| else: | ||
| leaves.append(leaf) | ||
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| pytree_out = jax.tree.unflatten(treedef, leaves) | ||
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| if prefix is MISSING: | ||
| return pytree_out, tuple(nodes) | ||
| else: | ||
| return pytree_out, tuple(nodes), tuple(node_prefixes) | ||
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| def insert_graph_nodes(pytree: A, nodes: tuple[tp.Any, ...], /) -> A: | ||
| """Inserts graph nodes into a pytree.""" | ||
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| def _maybe_insert(x): | ||
| if isinstance(x, Extractable): | ||
| return nodes[x.index] | ||
| return x | ||
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| return jax.tree_util.tree_map( | ||
| _maybe_insert, pytree, is_leaf=lambda x: isinstance(x, Extractable) | ||
| ) | ||
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| def extract_indexes( | ||
| pytree, /, types: tuple[type[E], ...] | type[E] = Extractable | ||
| ) -> tuple[E, ...]: | ||
| """Extracts all indexes from a pytree.""" | ||
| indexes: list[E] = [] | ||
| for x in jax.tree.leaves( | ||
| pytree, is_leaf=lambda x: isinstance(x, Extractable) | ||
| ): | ||
| if isinstance(x, Extractable): | ||
| if not isinstance(x, types): | ||
| raise ValueError(f'Expected Extractable of type {types}, got {type(x)}') | ||
| indexes.append(x) | ||
| return tuple(indexes) | ||
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| def replace_indexes( | ||
| pytree: A, | ||
| replace_fn: tp.Callable[[Extractable], tp.Any], | ||
| /, | ||
| clear: bool = False, | ||
| ) -> A: | ||
| def _replace_map_fn(x): | ||
| if isinstance(x, Extractable): | ||
| return replace_fn(x) | ||
| elif clear: | ||
| return None | ||
| return x | ||
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| return jax.tree_util.tree_map( | ||
| _replace_map_fn, pytree, is_leaf=lambda x: isinstance(x, Extractable) | ||
| ) | ||
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| def merge_extractable_states( | ||
| extractable_states: tp.Sequence[ExtractableStates], / | ||
| ): | ||
| if len(extractable_states) == 0: | ||
| raise ValueError('Expected at least one ExtractableStates object') | ||
|
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| graphdef = extractable_states[0].graphdef | ||
| flat_state = [] | ||
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| for extractable_state in extractable_states: | ||
| flat_state.extend( | ||
| ((extractable_state.index, *path), value) | ||
| for state in extractable_state.states | ||
| for path, value in state.flat_state().items() | ||
| ) | ||
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| state = State.from_flat_path(flat_state) | ||
| return graphdef, state | ||
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| def check_consistent_aliasing( | ||
| nodes: tuple[tp.Any, ...], prefixes: tuple[tp.Any, ...] | ||
| ): | ||
| node_prefixes = graph.RefMap[tp.Any, list[tuple[PathParts, tp.Any]]]() | ||
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| # collect all paths and prefixes for each node | ||
| for node, prefix in zip(nodes, prefixes): | ||
| for path, value in graph.iter_graph(node): | ||
| if graph.is_graph_node(value): | ||
| if value in node_prefixes: | ||
| paths_prefixes = node_prefixes[value] | ||
| paths_prefixes.append((path, prefix)) | ||
| else: | ||
| node_prefixes[value] = [(path, prefix)] | ||
|
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| # check for inconsistent aliasing | ||
| node_msgs = [] | ||
| for node, paths_prefixes in node_prefixes.items(): | ||
| unique_prefixes = {prefix for _, prefix in paths_prefixes} | ||
| if len(unique_prefixes) > 1: | ||
| path_prefix_repr = '\n'.join( | ||
| f' {"/".join(map(str,path)) if path else "<root>"}: {prefix}' | ||
| for path, prefix in paths_prefixes | ||
| ) | ||
| nodes_msg = f'Node: {type(node)}\n{path_prefix_repr}' | ||
| node_msgs.append(nodes_msg) | ||
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| if node_msgs: | ||
| raise ValueError( | ||
| 'Inconsistent aliasing detected. The following nodes have different prefixes:\n' | ||
| + '\n'.join(node_msgs) | ||
| ) |
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