code: def _dynamic_concat(a, b, m, axis=0):
      "Concatenates padded arrays `a` and `b` where the true size of `a` is `m`."
      if m is None:
          return jnp.concatenate([a, b], axis=axis)
      return lax.dynamic_update_slice_in_dim(
          _pad_in_dim(a, high=b.shape[axis], axis=axis), b, m, axis
      )
  
file_path: jax/jax/_src/lax/qdwh.py
imports: from __future__ import annotations
  import functools
  import jax
  import jax.numpy
  from jax import lax
  from jax._src import core
  from jax._src.lax import linalg
label_desc: Use image node_id 3 for calling a global function with example usage: _dynamic_concat(a, b, m, axis) and returns: lax, jnp