class_docstr: An interface for collecting metrics/counters in EnvironmentLoop.
docstr: Observes the initial state.
code: def observe_first(
      self, env: dm_env.Environment, timestep: dm_env.TimeStep
  ) -> None:
      """Observes the initial state."""
  
file_path: acme/acme/utils/observers/base.py
imports: import abc
  from typing import Dict, Union
  import dm_env
  import numpy
label_desc: Use image node_id 1 for calling the EnvLoopObserver obj's underlying member method code with example usage: obj.observe_first(env, timestep) without return types