docstr: Restore the state of a data class.
docstr_tok: ["Restore","the","state","of","a","data","class","."]
code: def _from_flax_state_dict(
      cls,
      pytree: P,
      state: dict[str, tp.Any],
  ) -> P:
      """Restore the state of a data class."""
      from flax import serialization
  
      state = (
          state.copy()
      )  # copy the state so we can pop the restored fields.
      updates = {}
      for name, value in vars(pytree).items():
          if not isinstance(
              value, (modulelib.Module, variables.Variable, Pytree)
          ):
              continue
          if name not in state:
              raise ValueError(
                  f"Missing field {name} in state dict while restoring"
                  f" an instance of {type(pytree).__name__},"
                  f" at path {serialization.current_path()}"
              )
          value_state = state.pop(name)
          updates[name] = serialization.from_state_dict(
              value, value_state, name=name
          )
      if state:
          names = ",".join(state.keys())
          raise ValueError(
              f'Unknown field(s) "{names}" in state dict while'
              f" restoring an instance of {type(pytree).__name__}"
              f" at path {serialization.current_path()}"
          )
      return pytree.replace(**updates)
  
imports: import contextlib
  import dataclasses
  import importlib.util
  import inspect
  import typing
  from abc import ABCMeta
  from copy import copy
  from functools import partial
  from types import MappingProxyType
  import jax
  import numpy
  from flax.experimental.nnx.nnx import module
  from flax.experimental.nnx.nnx import reprlib, variables
  from flax.experimental.nnx.nnx.state import State
label_desc: Use image node_id 6 for calling the Pytree obj's underlying member method code with example usage: obj._from_flax_state_dict(cls, pytree, state) and returns: pytree