code: def pack(
      fn: Callable[..., Any],
      in_variable_filters: Sequence[CollectionFilter],
      out_variable_filters: Sequence[CollectionFilter],
      rng_filters: Sequence[PRNGSequenceFilter],
      name=None,
      enable_kwargs=False,
  ) -> Callable[..., Any]:
      """Pack variables and rngs for functional transformations.
  
      The pack function is the building block for all other lifted transformations.
  
      Args:
        fn: The function to pack. `fn` has the signature
          `(scope_fn, repack_fn, variable_groups, rng_groups, *args) ->
          (output, packed_variables)`.
        in_variable_filters: Input variable filters.
        out_variable_filters: Output variable filters.
        rng_filters: RNG filters.
        name: The name of the packed scope.
        enable_kwargs: Whether to enable kwargs or not.
      Returns:
        A callable which expects a scope as the first argument.
      """
  
      @functools.wraps(fn)
      def wrapper(scope_tree: Scope, *args, **kwargs):
          if not enable_kwargs and kwargs:
              msg = 'kwargs are not supported in {}, so "{}" is(are) ignored'
              warnings.warn(
                  msg.format(name, ", ".join(kwargs.keys())),
                  RuntimeWarning,
              )
          (
              scope_fn,
              repack_fn,
              variable_groups_xs_t,
              rng_groups_xs_t,
              publish_results_fn,
              invalidate_scopes_fn,
          ) = _partial_pack(
              scope_tree,
              in_variable_filters,
              out_variable_filters,
              rng_filters,
              name,
          )
          try:
              if enable_kwargs:
                  y, out_variable_groups_xs_t = fn(
                      scope_fn,
                      repack_fn,
                      variable_groups_xs_t,
                      rng_groups_xs_t,
                      *args,
                      **kwargs,
                  )
              else:
                  y, out_variable_groups_xs_t = fn(
                      scope_fn,
                      repack_fn,
                      variable_groups_xs_t,
                      rng_groups_xs_t,
                      *args,
                  )
          finally:
              invalidate_scopes_fn()
          publish_results_fn(out_variable_groups_xs_t)
          return y
  
      return wrapper
  
imports: import collections
  import dataclasses
  import functools
  from typing import Any, Callable, Dict, Generic, Iterable, List, Mapping, Optional, Sequence, Tuple, TypeVar, Union
  import warnings
  from flax import traceback_util
  import jax
  from jax import random
  from .None import axes_scan, meta
  from .frozen_dict import freeze, unfreeze
  from .scope import CollectionFilter, DenyList, Filter, PRNGSequenceFilter, Scope, group_collections, in_filter, intersect_filters, is_filter_empty, subtract_filters, union_filters
label_desc: Use image node_id 6 for calling a global function with example usage: pack(fn, in_variable_filters, out_variable_filters, rng_filters, name, enable_kwargs) and returns: wrapper, y