code: def sigmoid_inv(y):
      return log(y) - log1p(-y)
  
imports: import math
  import operator
  from numbers import Number
  from .op import BINARY_INVERSES, DISTRIBUTIVE_OPS, PRODUCT_TO_POWER, SAFE_BINARY_INVERSES, UNARY_INVERSES, UNITS, BinaryOp, Op, OpMeta, TransformOp, UnaryOp, declare_op_types
label_desc: Use image node_id 19 for calling a global function with example usage: sigmoid_inv(y) and returns: unknown