class_docstr: Learnable trajectory length parameters.
docstr: Computes the mean trajectory length.
docstr_tok: ["Computes","the","mean","trajectory","length","."]
code: def mean_trajectory_length(self) -> fun_mc.FloatArray:
      """Computes the mean trajectory length."""
      return jnp.exp(self.log_mean_trajectory_length)
  
imports: from collections.abc import Mapping
  from typing import Any, Callable, NamedTuple, Optional
  import immutabledict
  from fun_mc import backend
  from fun_mc import fun_mc_lib
label_desc: Use image node_id 1 for calling the DefaultTrajectoryLengthParams obj's underlying member method code with example usage: obj.mean_trajectory_length() and returns: jnp