code: def issequence(t):
      return (
          isinstance(t, (list, tuple))
          and (len(t) == 0 or np.isscalar(t[0]))
      ) or (isinstance(t, np.ndarray) and (t.ndim == 1))
  
imports: import sys
  import operator
  import warnings
  import numpy
  from scipy._lib._util import prod
label_desc: Use image node_id 13 for calling a global function with example usage: issequence(t) and returns: unknown