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81 行
2.8 KiB
81 行
2.8 KiB
import pytest
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from mlagents.torch_utils import torch
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from mlagents.trainers.torch.action_model import ActionModel, DistInstances
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from mlagents.trainers.torch.agent_action import AgentAction
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from mlagents.trainers.torch.distributions import (
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GaussianDistInstance,
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CategoricalDistInstance,
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)
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from mlagents_envs.base_env import ActionSpec
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def create_action_model(inp_size, act_size):
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mask = torch.ones([1, act_size * 2])
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action_spec = ActionSpec(act_size, tuple(act_size for _ in range(act_size)))
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action_model = ActionModel(inp_size, action_spec)
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return action_model, mask
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def test_get_dists():
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inp_size = 4
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act_size = 2
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action_model, masks = create_action_model(inp_size, act_size)
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sample_inp = torch.ones((1, inp_size))
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dists = action_model._get_dists(sample_inp, masks=masks)
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assert isinstance(dists.continuous, GaussianDistInstance)
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assert len(dists.discrete) == 2
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for _dist in dists.discrete:
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assert isinstance(_dist, CategoricalDistInstance)
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def test_sample_action():
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inp_size = 4
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act_size = 2
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action_model, masks = create_action_model(inp_size, act_size)
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sample_inp = torch.ones((1, inp_size))
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dists = action_model._get_dists(sample_inp, masks=masks)
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agent_action = action_model._sample_action(dists)
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assert agent_action.continuous_tensor.shape == (1, 2)
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assert len(agent_action.discrete_list) == 2
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for _disc in agent_action.discrete_list:
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assert _disc.shape == (1, 1)
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def test_get_probs_and_entropy():
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inp_size = 4
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act_size = 2
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action_model, masks = create_action_model(inp_size, act_size)
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_continuous_dist = GaussianDistInstance(torch.zeros((1, 2)), torch.ones((1, 2)))
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act_size = 2
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test_prob = torch.tensor([[1.0 - 0.1 * (act_size - 1)] + [0.1] * (act_size - 1)])
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_discrete_dist_list = [
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CategoricalDistInstance(test_prob),
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CategoricalDistInstance(test_prob),
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]
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dist_tuple = DistInstances(_continuous_dist, _discrete_dist_list)
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agent_action = AgentAction(
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torch.zeros((1, 2)), [torch.tensor([0]), torch.tensor([1])]
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)
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log_probs, entropies = action_model._get_probs_and_entropy(agent_action, dist_tuple)
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assert log_probs.continuous_tensor.shape == (1, 2)
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assert len(log_probs.discrete_list) == 2
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for _disc in log_probs.discrete_list:
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assert _disc.shape == (1,)
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assert len(log_probs.all_discrete_list) == 2
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for _disc in log_probs.all_discrete_list:
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assert _disc.shape == (1, 2)
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for clp in log_probs.continuous_tensor[0]:
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# Log prob of standard normal at 0
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assert clp == pytest.approx(-0.919, abs=0.01)
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assert log_probs.discrete_list[0] > log_probs.discrete_list[1]
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for ent, val in zip(entropies[0], [1.4189, 0.6191, 0.6191]):
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assert ent == pytest.approx(val, abs=0.01)
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