Added save and load functionality
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dcf7cce30d
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2 changed files with 26 additions and 3 deletions
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@ -4,6 +4,7 @@ import torch
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import torch.nn.functional as F
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from copy import deepcopy
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import numpy as np
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from pathlib import Path
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class DQNAgent:
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def __init__(self, net , memory, config, target_net = None, logger = None):
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@ -12,6 +13,12 @@ class DQNAgent:
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self.memory = memory
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self.config = deepcopy(config)
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self.logger = logger
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def save(self, file_location):
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torch.save(self.net.model.state_dict(), file_location)
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def load(self, file_location):
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self.net.model.state_dict(torch.load(file_location))
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self.net.model.to(self.net.device)
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self.target_net.sync()
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def learn(self, logger = None):
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if len(self.memory) < self.config['batch_size']:
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@ -57,8 +64,10 @@ class DQNAgent:
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# If we're sampling by TD error, multiply loss by a importance weight which helps decrease overfitting
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if (isinstance(self.memory, M.PrioritizedReplayMemory)):
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# loss = (torch.as_tensor(importance_weights, device = self.net.device) * F.smooth_l1_loss(obtained_values, expected_values, reduction = 'none').squeeze(1)).mean()
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loss = (torch.as_tensor(importance_weights, device = self.net.device) * ((obtained_values - expected_values)**2).squeeze(1)).mean()
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else:
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# loss = F.smooth_l1_loss(obtained_values, expected_values)
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loss = F.mse_loss(obtained_values, expected_values)
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if self.logger is not None:
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@ -3,6 +3,7 @@ import collections
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import numpy as np
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import torch
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from torch.distributions import Categorical
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import torch.nn.functional as F
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import rltorch
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import rltorch.memory as M
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@ -21,6 +22,19 @@ class QEPAgent:
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self.logger = logger
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self.policy_skip = 4
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def save(self, file_location):
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torch.save({
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'policy': self.policy_net.model.state_dict(),
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'value': self.value_net.model.state_dict()
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}, file_location)
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def load(self, file_location):
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checkpoint = torch.load(file_location)
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self.value_net.model.state_dict(checkpoint['value'])
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self.value_net.model.to(self.value_net.device)
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self.policy_net.model.state_dict(checkpoint['policy'])
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self.policy_net.model.to(self.policy_net.device)
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self.target_net.sync()
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def fitness(self, policy_net, value_net, state_batch):
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batch_size = len(state_batch)
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action_probabilities = policy_net(state_batch)
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@ -37,7 +51,7 @@ class QEPAgent:
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value_importance = 1 - entropy_importance
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# entropy_loss = (action_probabilities * torch.log2(action_probabilities)).sum(1) # Standard entropy loss from information theory
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entropy_loss = (action_probabilities - torch.tensor(1 / action_size).repeat(len(state_batch), action_size)).abs().sum(1)
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entropy_loss = (action_probabilities - torch.tensor(1 / action_size, device = state_batch.device).repeat(len(state_batch), action_size)).abs().sum(1)
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return (entropy_importance * entropy_loss - value_importance * obtained_values).mean().item()
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@ -116,6 +130,6 @@ class QEPAgent:
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self.policy_net.calc_gradients(self.target_value_net, state_batch)
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else:
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self.policy_net.calc_gradients(self.value_net, state_batch)
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# self.policy_net.clamp_gradients()
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##### self.policy_net.clamp_gradients()
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self.policy_net.step()
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