code: def _concat_vectors(*args):
      """Convenience function which concatenates input vectors."""
      args_ = [_static_value(x) for x in args]
      if any(x_ is None for x_ in args_):
          return array_ops.concat(args, 0)
      return constant_op.constant([x_ for vec_ in args_ for x_ in vec_])
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import check_ops
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops.distributions import distribution
  from tensorflow.python.ops.distributions import identity_bijector
  from tensorflow.python.ops.distributions import util
  from tensorflow.python.util import deprecation
label_desc: Use image node_id 5 for calling a global function with example usage: _concat_vectors() and returns: constant_op, array_ops