code: def sign_seq(poly_seq, x):
      """
      Given a sequence of polynomials poly_seq, it returns
      the sequence of signs of the leading coefficients of
      the polynomials in poly_seq.
  
      """
      return [sign(LC(poly_seq[i], x)) for i in range(len(poly_seq))]
  
imports: from sympy.concrete.summations import summation
  from sympy.core.function import expand
  from sympy.core.numbers import nan
  from sympy.core.singleton import S
  from sympy.core.symbol import Dummy
  from sympy.functions.elementary.complexes import Abs, sign
  from sympy.functions.elementary.integers import floor
  from sympy.matrices.dense import eye, Matrix, zeros
  from sympy.printing.pretty.pretty import pretty_print
  from sympy.simplify.simplify import simplify
  from sympy.polys.domains import QQ
  from sympy.polys.polytools import degree, LC, Poly, pquo, quo, prem, rem
  from sympy.polys.polyerrors import PolynomialError
label_desc: Use image node_id 8 for calling a global function with example usage: sign_seq(poly_seq, x) and returns: unknown