code: def _sigmoid_kernel(self, support_vector):
      kernel = self._linear_kernel_with_gamma_and_coef(support_vector)
      return ast.TanhExpr(kernel)
  
imports: import numpy
  from m2cgen import ast
  from m2cgen.assemblers import utils
  from m2cgen.assemblers.base import ModelAssembler
label_desc: Use image node_id 7 for calling the SklearnSVMModelAssembler obj's underlying member method code with example usage: obj._sigmoid_kernel(support_vector) and returns: ast