code: def grad_gamma_logpdf_arg1(x, a):
      return np.log(x) - psi(a)
  
file_path: autograd/autograd/scipy/stats/gamma.py
imports: from __future__ import absolute_import
  import autograd.numpy
  import scipy.stats
  from autograd.extend import primitive, defvjp
  from autograd.numpy.numpy_vjps import unbroadcast_f
  from autograd.scipy.special import gamma, psi
label_desc: Use image node_id 2 for calling a global function with example usage: grad_gamma_logpdf_arg1(x, a) and returns: unknown