code: def _signed_hyperbolic_tx(
      x: tf.Tensor, eps: float = 1e-3
  ) -> tf.Tensor:
      """Signed hyperbolic transform, inverse of signed_parabolic."""
      return tf.sign(x) * (tf.sqrt(abs(x) + 1) - 1) + eps * x
  
file_path: acme/acme/tf/losses/r2d2.py
imports: from typing import Iterable, NamedTuple, Sequence
  import tensorflow
  import trfl
label_desc: Use image node_id 3 for calling a global function with example usage: _signed_hyperbolic_tx(x, eps) and returns: unknown