code: def lower_tril_positive_definite(x):
      return tf.linalg.band_part(
          tf.linalg.set_diag(
              x, softplus_plus_eps(1e-1)(tf.linalg.diag_part(x))
          ),
          num_lower=-1,
          num_upper=0,
      )
  
imports: import contextlib
  import os
  import re
  import traceback
  import unittest
  import hypothesis
  from hypothesis.extra import numpy
  import hypothesis.strategies
  import numpy
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import dtype_util
  from tensorflow_probability.python.internal import tensorshape_util
  from tensorflow_probability.python.util.deferred_tensor import DeferredTensor
label_desc: Use image node_id 40 for calling a global function with example usage: lower_tril_positive_definite(x) and returns: tf