code: def _make_placeholder(self, x):
      return tf1.placeholder_with_default(
          x, shape=(x.shape if self.use_static_shape else None)
      )
  
imports: import numpy
  import tensorflow.compat.v1
  import tensorflow.compat.v2
  from tensorflow_probability.python.internal import test_util
  from tensorflow_probability.python.optimizer import proximal_hessian_sparse
label_desc: Use image node_id 1 for calling the _ProximalHessianTest obj's underlying member method code with example usage: obj._make_placeholder(x) and returns: tf1