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216 行
7.9 KiB
216 行
7.9 KiB
import pytest
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import torch
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import numpy as np
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from mlagents.trainers.settings import EncoderType, ScheduleType
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from mlagents.trainers.torch.utils import ModelUtils
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from mlagents.trainers.exception import UnityTrainerException
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from mlagents.trainers.torch.encoders import (
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VectorEncoder,
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VectorAndUnnormalizedInputEncoder,
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)
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from mlagents.trainers.torch.distributions import (
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CategoricalDistInstance,
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GaussianDistInstance,
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)
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def test_min_visual_size():
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# Make sure each EncoderType has an entry in MIS_RESOLUTION_FOR_ENCODER
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assert set(ModelUtils.MIN_RESOLUTION_FOR_ENCODER.keys()) == set(EncoderType)
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for encoder_type in EncoderType:
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good_size = ModelUtils.MIN_RESOLUTION_FOR_ENCODER[encoder_type]
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vis_input = torch.ones((1, 3, good_size, good_size))
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ModelUtils._check_resolution_for_encoder(good_size, good_size, encoder_type)
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enc_func = ModelUtils.get_encoder_for_type(encoder_type)
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enc = enc_func(good_size, good_size, 3, 1)
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enc.forward(vis_input)
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# Anything under the min size should raise an exception. If not, decrease the min size!
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with pytest.raises(Exception):
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bad_size = ModelUtils.MIN_RESOLUTION_FOR_ENCODER[encoder_type] - 1
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vis_input = torch.ones((1, 3, bad_size, bad_size))
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with pytest.raises(UnityTrainerException):
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# Make sure we'd hit a friendly error during model setup time.
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ModelUtils._check_resolution_for_encoder(
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bad_size, bad_size, encoder_type
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)
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enc = enc_func(bad_size, bad_size, 3, 1)
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enc.forward(vis_input)
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@pytest.mark.parametrize("unnormalized_inputs", [0, 1])
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@pytest.mark.parametrize("num_visual", [0, 1, 2])
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@pytest.mark.parametrize("num_vector", [0, 1, 2])
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@pytest.mark.parametrize("normalize", [True, False])
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@pytest.mark.parametrize("encoder_type", [EncoderType.SIMPLE, EncoderType.NATURE_CNN])
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def test_create_encoders(
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encoder_type, normalize, num_vector, num_visual, unnormalized_inputs
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):
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vec_obs_shape = (5,)
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vis_obs_shape = (84, 84, 3)
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obs_shapes = []
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for _ in range(num_vector):
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obs_shapes.append(vec_obs_shape)
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for _ in range(num_visual):
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obs_shapes.append(vis_obs_shape)
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h_size = 128
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num_layers = 3
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unnormalized_inputs = 1
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vis_enc, vec_enc = ModelUtils.create_encoders(
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obs_shapes, h_size, num_layers, encoder_type, unnormalized_inputs, normalize
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)
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vec_enc = list(vec_enc)
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vis_enc = list(vis_enc)
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assert len(vec_enc) == (
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1 if unnormalized_inputs + num_vector > 0 else 0
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) # There's always at most one vector encoder.
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assert len(vis_enc) == num_visual
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if unnormalized_inputs > 0:
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assert isinstance(vec_enc[0], VectorAndUnnormalizedInputEncoder)
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elif num_vector > 0:
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assert isinstance(vec_enc[0], VectorEncoder)
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for enc in vis_enc:
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assert isinstance(enc, ModelUtils.get_encoder_for_type(encoder_type))
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def test_decayed_value():
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test_steps = [0, 4, 9]
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# Test constant decay
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param = ModelUtils.DecayedValue(ScheduleType.CONSTANT, 1.0, 0.2, test_steps[-1])
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for _step in test_steps:
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_param = param.get_value(_step)
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assert _param == 1.0
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test_results = [1.0, 0.6444, 0.2]
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# Test linear decay
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param = ModelUtils.DecayedValue(ScheduleType.LINEAR, 1.0, 0.2, test_steps[-1])
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for _step, _result in zip(test_steps, test_results):
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_param = param.get_value(_step)
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assert _param == pytest.approx(_result, abs=0.01)
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# Test invalid
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with pytest.raises(UnityTrainerException):
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ModelUtils.DecayedValue(
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"SomeOtherSchedule", 1.0, 0.2, test_steps[-1]
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).get_value(0)
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def test_polynomial_decay():
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test_steps = [0, 4, 9]
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test_results = [1.0, 0.7, 0.2]
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for _step, _result in zip(test_steps, test_results):
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decayed = ModelUtils.polynomial_decay(
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1.0, 0.2, test_steps[-1], _step, power=0.8
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)
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assert decayed == pytest.approx(_result, abs=0.01)
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def test_list_to_tensor():
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# Test converting pure list
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unconverted_list = [[1, 2], [1, 3], [1, 4]]
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tensor = ModelUtils.list_to_tensor(unconverted_list)
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# Should be equivalent to torch.tensor conversion
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assert torch.equal(tensor, torch.tensor(unconverted_list))
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# Test converting pure numpy array
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np_list = np.asarray(unconverted_list)
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tensor = ModelUtils.list_to_tensor(np_list)
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# Should be equivalent to torch.tensor conversion
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assert torch.equal(tensor, torch.tensor(unconverted_list))
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# Test converting list of numpy arrays
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list_of_np = [np.asarray(_el) for _el in unconverted_list]
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tensor = ModelUtils.list_to_tensor(list_of_np)
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# Should be equivalent to torch.tensor conversion
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assert torch.equal(tensor, torch.tensor(unconverted_list))
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def test_break_into_branches():
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# Test normal multi-branch case
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all_actions = torch.tensor([[1, 2, 3, 4, 5, 6]])
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action_size = [2, 1, 3]
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broken_actions = ModelUtils.break_into_branches(all_actions, action_size)
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assert len(action_size) == len(broken_actions)
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for i, _action in enumerate(broken_actions):
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assert _action.shape == (1, action_size[i])
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# Test 1-branch case
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action_size = [6]
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broken_actions = ModelUtils.break_into_branches(all_actions, action_size)
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assert len(broken_actions) == 1
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assert broken_actions[0].shape == (1, 6)
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def test_actions_to_onehot():
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all_actions = torch.tensor([[1, 0, 2], [1, 0, 2]])
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action_size = [2, 1, 3]
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oh_actions = ModelUtils.actions_to_onehot(all_actions, action_size)
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expected_result = [
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torch.tensor([[0, 1], [0, 1]], dtype=torch.float),
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torch.tensor([[1], [1]], dtype=torch.float),
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torch.tensor([[0, 0, 1], [0, 0, 1]], dtype=torch.float),
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]
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for res, exp in zip(oh_actions, expected_result):
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assert torch.equal(res, exp)
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def test_get_probs_and_entropy():
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# Test continuous
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# Add two dists to the list. This isn't done in the code but we'd like to support it.
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dist_list = [
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GaussianDistInstance(torch.zeros((1, 2)), torch.ones((1, 2))),
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GaussianDistInstance(torch.zeros((1, 2)), torch.ones((1, 2))),
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]
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action_list = [torch.zeros((1, 2)), torch.zeros((1, 2))]
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log_probs, entropies, all_probs = ModelUtils.get_probs_and_entropy(
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action_list, dist_list
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)
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assert log_probs.shape == (1, 2, 2)
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assert entropies.shape == (1, 2, 2)
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assert all_probs is None
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for log_prob in log_probs.flatten():
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# Log prob of standard normal at 0
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assert log_prob == pytest.approx(-0.919, abs=0.01)
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for ent in entropies.flatten():
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# entropy of standard normal at 0
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assert ent == pytest.approx(1.42, abs=0.01)
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# Test continuous
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# Add two dists to the list.
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act_size = 2
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test_prob = torch.tensor(
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[[1.0 - 0.1 * (act_size - 1)] + [0.1] * (act_size - 1)]
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) # High prob for first action
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dist_list = [CategoricalDistInstance(test_prob), CategoricalDistInstance(test_prob)]
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action_list = [torch.tensor([0]), torch.tensor([1])]
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log_probs, entropies, all_probs = ModelUtils.get_probs_and_entropy(
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action_list, dist_list
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)
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assert all_probs.shape == (1, len(dist_list * act_size))
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assert entropies.shape == (1, len(dist_list))
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# Make sure the first action has high probability than the others.
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assert log_probs.flatten()[0] > log_probs.flatten()[1]
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def test_masked_mean():
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test_input = torch.tensor([1, 2, 3, 4, 5])
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masks = torch.ones_like(test_input).bool()
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mean = ModelUtils.masked_mean(test_input, masks=masks)
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assert mean == 3.0
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masks = torch.tensor([False, False, True, True, True])
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mean = ModelUtils.masked_mean(test_input, masks=masks)
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assert mean == 4.0
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# Make sure it works if all masks are off
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masks = torch.tensor([False, False, False, False, False])
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mean = ModelUtils.masked_mean(test_input, masks=masks)
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assert mean == 0.0
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