code: def make_2d(
      x: Optional[jnp.ndarray],
      start_axis: int = 0,
      end_axis: Optional[int] = None,
  ) -> Optional[jnp.ndarray]:
      """Makes `x` 2D from `start_axis` to `end_axis`, preserving other axes.
  
      `x` is assumed to follow the (`X, X, Y, Y, Z, Z`) axes layout.
  
      Example:
        >>> x = np.ones((1, 2, 3, 3, 4, 4))
        >>> make_2d(x).shape == (12, 24)
        >>> #
        >>> make_2d(x, 2).shape == (1, 2, 12, 12)
        >>> #
        >>> make_2d(x, 2, 4).shape == (1, 2, 3, 3, 4, 4)
      """
      if x is None:
          return x
  
      if end_axis is None:
          end_axis = x.ndim
  
      x = unzip_axes(x, start_axis, end_axis)
  
      half_ndim = (end_axis - start_axis) // 2
      x = x.reshape(
          x.shape[:start_axis]
          + (
              size_at(x.shape[start_axis : start_axis + half_ndim]),
              size_at(x.shape[start_axis + half_ndim : end_axis]),
          )
          + x.shape[end_axis:]
      )
      return x
  
imports: from collections import namedtuple
  import functools
  import inspect
  import operator
  import types
  from typing import Any, Callable, Iterable, Optional, Sequence, Sized, TypeVar, Union
  import warnings
  import jax
  from jax import core
  from jax import random
  import jax.numpy
  from jax.tree_util import tree_all
  from jax.tree_util import tree_map
  import numpy
label_desc: Use image node_id 25 for calling a global function with example usage: make_2d(x, start_axis, end_axis) and returns: x, x