class_docstr: Check the construction of MaskInfo from Mask.
class_docstr_tok: ["Check","the","construction","of","MaskInfo","from","Mask","."]
code: def _stack(self, arrays: List[np.ndarray]) -> np.ndarray:
      return np.stack(arrays, axis=0)
  
imports: from __future__ import annotations
  from typing import List
  from absl.testing import absltest
  from absl.testing import parameterized
  import jax
  from jax.experimental.pallas.ops.tpu.splash_attention import splash_attention_mask
  from jax.experimental.pallas.ops.tpu.splash_attention import splash_attention_mask_info
  from jax._src import test_util
  import numpy
label_desc: Use image node_id 6 for calling the SplashAttentionMaskInfoTest obj's underlying member method code with example usage: obj._stack(arrays) and returns: np