class_docstr: Event interface, defining statistics emitted by the ESTrainer.
class_docstr_tok: ["Event","interface",",","defining","statistics","emitted","by","the","ESTrainer","."]
docstr: l2 norm of the step policy parameters
docstr_tok: ["l2","norm","of","the","step","policy","parameters"]
code: def policy_norm(self, policy_id: int, value: float):
      """l2 norm of the step policy parameters"""
  
imports: import numpy
  from maze.core.log_stats.event_decorators import define_epoch_stats, define_stats_grouping
label_desc: Use image node_id 2 for calling the ESEvents obj's underlying member method code with example usage: obj.policy_norm(policy_id, value) without return types