code: def tv_variate_exp(df):
      return (sqrt(df) * gamma((df - 1.0) / 2.0)) / (
          sqrt(pi) * gamma(df / 2.0)
      )
  
imports: from numpy import abs, exp, power, array, sqrt, pi
  from scipy.special import gamma
label_desc: Use image node_id 2 for calling the SkewBetatScore obj's underlying member method code with example usage: obj.tv_variate_exp(df) and returns: unknown