code: def act(self, obs, deterministic=False, enable_grad=False):
      with torch.set_grad_enabled(enable_grad):
          dist = self(obs)
          return dist.mean if deterministic else dist.sample()
  
imports: from cmath import log
  import parl
  import torch
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 3 for calling the Actor obj's underlying member method code with example usage: obj.act(obs, deterministic, enable_grad) and returns: unknown