class VDN:
def __init__(self, args):
self.n_actions = args.n_actions
self.n_agents = args.n_agents
self.state_shape = args.state_shape
self.obs_shape = args.obs_shape
input_shape = self.obs_shape
# 根据参数决定RNN的输入维度
if args.last_action:
input_shape += self.n_actions
if args.reuse_network:
input_shape += self.n_agents
# 神经网络
self.eval_rnn = RNN(input_shape, args) # 每个agent选动作的网络
self.target_rnn = RNN(input_shape, args)
self.eval_vdn_net = VDNNet() # 把agentsQ值加起来的网络
self.target_vdn_net = VDNNet()
self.args = args
if self.args.cuda:
self.eval_rnn.cuda()
self.target_rnn.cuda()
self.eval_vdn_net.cuda()
self.target_vdn_net.cuda()
self.model_dir = args.model_dir + '/' + args.alg + '/' + args.map
# 如果存在模型则加载模型
if self.args.load_model:
if os.path.exists(self.model_dir + '/rnn_net_params.pkl'):
path_rnn = self.model_dir + '/rnn_net_params.pkl'
path_vdn = self.model_dir + '/vdn_net_params.pkl'
map_location = 'cuda:0' if self.args.cuda else 'cpu'
self.eval_rnn.load_state_dict(
torch.load(path_rnn, map_location=map_location))
self.eval_vdn_net.load_state_dict(
torch.load(path_vdn, map_location=map_location))
print('Successfully load the model: {} and {}'.format(
path_rnn, path_vdn))
else:
raise Exception("No model!")
# 让target_net和eval_net的网络参数相同
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_vdn_net.load_state_dict(self.eval_vdn_net.state_dict())
self.eval_parameters = list(self.eval_vdn_net.parameters()) + list(
self.eval_rnn.parameters())
if args.optimizer == "RMS":
self.optimizer = torch.optim.RMSprop(self.eval_parameters,
lr=args.lr)
# 执行过程中，要为每个agent都维护一个eval_hidden
# 学习过程中，要为每个episode的每个agent都维护一个eval_hidden、target_hidden
self.eval_hidden = None
self.target_hidden = None
print('Init alg VDN')
def learn(self,
batch,
max_episode_len,
train_step,
epsilon=None): # train_step表示是第几次学习，用来控制更新target_net网络的参数
'''
在learn的时候，抽取到的数据是四维的，四个维度分别为 1——第几个episode 2——episode中第几个transition
3——第几个agent的数据 4——具体obs维度。因为在选动作时不仅需要输入当前的inputs，还要给神经网络输入hidden_state，
hidden_state和之前的经验相关，因此就不能随机抽取经验进行学习。所以这里一次抽取多个episode，然后一次给神经网络
传入每个episode的同一个位置的transition
'''
episode_num = batch['o'].shape[0]
self.init_hidden(episode_num)
for key in batch.keys(): # 把batch里的数据转化成tensor
if key == 'u':
batch[key] = torch.tensor(batch[key], dtype=torch.long)
else:
batch[key] = torch.tensor(batch[key], dtype=torch.float32)
# TODO pymarl中取得经验没有取最后一条，找出原因
u, r, avail_u, avail_u_next, terminated = batch['u'], batch['r'], batch['avail_u'], \
batch['avail_u_next'], batch['terminated']
mask = 1 - batch["padded"].float() # 用来把那些填充的经验的TD-error置0，从而不让它们影响到学习
if self.args.cuda:
u = u.cuda()
r = r.cuda()
mask = mask.cuda()
terminated = terminated.cuda()
# 得到每个agent对应的Q值，维度为(episode个数, max_episode_len， n_agents，n_actions)
q_evals, q_targets = self.get_q_values(batch, max_episode_len)
# 取每个agent动作对应的Q值，并且把最后不需要的一维去掉，因为最后一维只有一个值了
q_evals = torch.gather(q_evals, dim=3, index=u).squeeze(3)
# 得到target_q
q_targets[avail_u_next == 0.0] = -9999999
q_targets = q_targets.max(dim=3)[0]
q_total_eval = self.eval_vdn_net(q_evals)
q_total_target = self.target_vdn_net(q_targets)
targets = r + self.args.gamma * q_total_target * (1 - terminated)
td_error = targets.detach() - q_total_eval
masked_td_error = mask * td_error # 抹掉填充的经验的td_error
# loss = masked_td_error.pow(2).mean()
# 不能直接用mean，因为还有许多经验是没用的，所以要求和再比真实的经验数，才是真正的均值
loss = (masked_td_error**2).sum() / mask.sum()
# print('Loss is ', loss)
self.optimizer.zero_grad()
loss.backward()
torch.nn.utils.clip_grad_norm_(self.eval_parameters,
self.args.grad_norm_clip)
self.optimizer.step()
if train_step > 0 and train_step % self.args.target_update_cycle == 0:
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_vdn_net.load_state_dict(self.eval_vdn_net.state_dict())
def _get_inputs(self, batch, transition_idx):
# 取出所有episode上该transition_idx的经验，u_onehot要取出所有，因为要用到上一条
obs, obs_next, u_onehot = batch['o'][:, transition_idx], \
batch['o_next'][:, transition_idx], batch['u_onehot'][:]
episode_num = obs.shape[0]
inputs, inputs_next = [], []
inputs.append(obs)
inputs_next.append(obs_next)
# 给obs添加上一个动作、agent编号
if self.args.last_action:
if transition_idx == 0: # 如果是第一条经验，就让前一个动作为0向量
inputs.append(torch.zeros_like(u_onehot[:, transition_idx]))
else:
inputs.append(u_onehot[:, transition_idx - 1])
inputs_next.append(u_onehot[:, transition_idx])
if self.args.reuse_network:
# 因为当前的obs三维的数据，每一维分别代表(episode，agent，obs维度)，直接在dim_1上添加对应的向量
# 即可，比如给agent_0后面加(1, 0, 0, 0, 0)，表示5个agent中的0号。而agent_0的数据正好在第0行，那么需要加的
# agent编号恰好就是一个单位矩阵，即对角线为1，其余为0
inputs.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
inputs_next.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
# 要把obs中的三个拼起来，并且要把episode_num个episode、self.args.n_agents个agent的数据拼成episode_num*n_agents条数据
# 因为这里所有agent共享一个神经网络，每条数据中带上了自己的编号，所以还是自己的数据
inputs = torch.cat(
[x.reshape(episode_num * self.args.n_agents, -1) for x in inputs],
dim=1)
inputs_next = torch.cat([
x.reshape(episode_num * self.args.n_agents, -1)
for x in inputs_next
],
dim=1)
return inputs, inputs_next
def get_q_values(self, batch, max_episode_len):
episode_num = batch['o'].shape[0]
q_evals, q_targets = [], []
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(
batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
q_eval, self.eval_hidden = self.eval_rnn(
inputs, self.eval_hidden
) # 得到的q_eval维度为(episode_num*n_agents, n_actions)
q_target, self.target_hidden = self.target_rnn(
inputs_next, self.target_hidden)
# 把q_eval维度重新变回(episode_num, n_agents, n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_target = q_target.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
q_targets.append(q_target)
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_evals = torch.stack(q_evals, dim=1)
q_targets = torch.stack(q_targets, dim=1)
return q_evals, q_targets
def init_hidden(self, episode_num):
# 为每个episode中的每个agent都初始化一个eval_hidden、target_hidden
self.eval_hidden = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.target_hidden = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
def save_model(self, train_step):
num = str(train_step // self.args.save_cycle)
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
torch.save(self.eval_vdn_net.state_dict(),
self.model_dir + '/' + num + '_vdn_net_params.pkl')
torch.save(self.eval_rnn.state_dict(),
self.model_dir + '/' + num + '_rnn_net_params.pkl')
class QtranAlt:
def __init__(self, args):
self.n_actions = args.n_actions
self.n_agents = args.n_agents
self.state_shape = args.state_shape
self.obs_shape = args.obs_shape
rnn_input_shape = self.obs_shape
# 根据参数决定RNN的输入维度
if args.last_action:
rnn_input_shape += self.n_actions # 当前agent的上一个动作的one_hot向量
if args.reuse_network:
rnn_input_shape += self.n_agents
self.args = args
# 神经网络
self.eval_rnn = RNN(rnn_input_shape, args) # individual networks
self.target_rnn = RNN(rnn_input_shape, args)
self.eval_joint_q = QtranQAlt(args) # counterfactual joint networks
self.target_joint_q = QtranQAlt(args)
self.v = QtranV(args)
if self.args.cuda:
self.eval_rnn.cuda()
self.target_rnn.cuda()
self.eval_joint_q.cuda()
self.target_joint_q.cuda()
self.v.cuda()
self.model_dir = args.model_dir + '/' + args.alg + '/' + args.map
# 如果存在模型则加载模型
if self.args.load_model:
if os.path.exists(self.model_dir + '/rnn_net_params.pkl'):
path_rnn = self.model_dir + '/rnn_net_params.pkl'
path_joint_q = self.model_dir + '/joint_q_params.pkl'
path_v = self.model_dir + '/v_params.pkl'
map_location = 'cuda:0' if self.args.cuda else 'cpu'
self.eval_rnn.load_state_dict(
torch.load(path_rnn, map_location=map_location))
self.eval_joint_q.load_state_dict(
torch.load(path_joint_q, map_location=map_location))
self.v.load_state_dict(
torch.load(path_v, map_location=map_location))
print('Successfully load the model: {}, {} and {}'.format(
path_rnn, path_joint_q, path_v))
else:
raise Exception("No model!")
# 让target_net和eval_net的网络参数相同
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_joint_q.load_state_dict(self.eval_joint_q.state_dict())
self.eval_parameters = list(self.eval_joint_q.parameters()) + \
list(self.v.parameters()) + \
list(self.eval_rnn.parameters())
if args.optimizer == "RMS":
self.optimizer = torch.optim.RMSprop(self.eval_parameters,
lr=args.lr)
# 执行过程中，要为每个agent都维护一个eval_hidden
# 学习过程中，要为每个episode的每个agent都维护一个eval_hidden、target_hidden
self.eval_hidden = None
self.target_hidden = None
print('Init alg QTRAN-alt')
def learn(self,
batch,
max_episode_len,
train_step,
epsilon=None): # train_step表示是第几次学习，用来控制更新target_net网络的参数
'''
在learn的时候，抽取到的数据是四维的，四个维度分别为 1——第几个episode 2——episode中第几个transition
3——第几个agent的数据 4——具体obs维度。因为在选动作时不仅需要输入当前的inputs，还要给神经网络输入hidden_state，
hidden_state和之前的经验相关，因此就不能随机抽取经验进行学习。所以这里一次抽取多个episode，然后一次给神经网络
传入每个episode的同一个位置的transition
'''
episode_num = batch['o'].shape[0]
self.init_hidden(episode_num)
for key in batch.keys(): # 把batch里的数据转化成tensor
if key == 'u':
batch[key] = torch.tensor(batch[key], dtype=torch.long)
else:
batch[key] = torch.tensor(batch[key], dtype=torch.float32)
s, s_next, u, r, avail_u, avail_u_next, terminated = batch['s'], batch['s_next'], batch['u'], \
batch['r'], batch['avail_u'], batch['avail_u_next'],\
batch['terminated']
mask = 1 - batch["padded"].float().repeat(
1, 1, self.n_agents) # 用来把那些填充的经验的TD-error置0，从而不让它们影响到学习
if self.args.cuda:
u = u.cuda()
r = r.cuda()
avail_u = avail_u.cuda()
avail_u_next = avail_u_next.cuda()
terminated = terminated.cuda()
mask = mask.cuda()
# 得到每个agent对应的Q和hidden_states，维度为(episode个数, max_episode_len， n_agents， n_actions/hidden_dim)
individual_q_evals, individual_q_targets, hidden_evals, hidden_targets = self._get_individual_q(
batch, max_episode_len)
# 得到当前时刻和下一时刻每个agent的局部最优动作及其one_hot表示
individual_q_clone = individual_q_evals.clone()
individual_q_clone[avail_u == 0.0] = -999999
individual_q_targets[avail_u_next == 0.0] = -999999
opt_onehot_eval = torch.zeros(*individual_q_clone.shape)
opt_action_eval = individual_q_clone.argmax(dim=3, keepdim=True)
opt_onehot_eval = opt_onehot_eval.scatter(-1,
opt_action_eval[:, :].cpu(),
1)
opt_onehot_target = torch.zeros(*individual_q_targets.shape)
opt_action_target = individual_q_targets.argmax(dim=3, keepdim=True)
opt_onehot_target = opt_onehot_target.scatter(
-1, opt_action_target[:, :].cpu(), 1)
# ---------------------------------------------L_td-------------------------------------------------------------
# 计算joint_q和v，要注意joint_q是每个agent都有，v只有一个
# joint_q的维度为(episode个数, max_episode_len， n_agents， n_actions), 而且joint_q在后面的l_nopt还要用到
# v的维度为(episode个数, max_episode_len)
joint_q_evals, joint_q_targets, v = self.get_qtran(
batch, opt_onehot_target, hidden_evals, hidden_targets)
# 取出当前agent动作对应的joint_q_chosen以及它的局部最优动作对应的joint_q
joint_q_chosen = torch.gather(joint_q_evals, dim=-1, index=u).squeeze(
-1) # (episode个数, max_episode_len, n_agents)
joint_q_opt = torch.gather(joint_q_targets,
dim=-1,
index=opt_action_target).squeeze(-1)
# loss
y_dqn = r.repeat(1, 1,
self.n_agents) + self.args.gamma * joint_q_opt * (
1 - terminated.repeat(1, 1, self.n_agents))
td_error = joint_q_chosen - y_dqn.detach()
l_td = ((td_error * mask)**2).sum() / mask.sum()
# ---------------------------------------------L_td-------------------------------------------------------------
# ---------------------------------------------L_opt------------------------------------------------------------
# 将局部最优动作的Q值相加 (episode个数,max_episode_len)
# 这里要使用individual_q_clone，它把不能执行的动作Q值改变了，使用individual_q_evals可能会使用不能执行的动作的Q值
q_sum_opt = individual_q_clone.max(dim=-1)[0].sum(dim=-1)
# 重新得到joint_q_opt_eval，它和joint_q_evals的区别是前者输入的动作是当前局部最优动作，后者输入的动作是当前执行的动作
joint_q_opt_evals, _, _ = self.get_qtran(batch,
opt_onehot_eval,
hidden_evals,
hidden_targets,
hat=True)
joint_q_opt_evals = torch.gather(
joint_q_opt_evals, dim=-1, index=opt_action_eval).squeeze(
-1) # (episode个数, max_episode_len， n_agents)
# 因为QTRAN-alt要对每个agent都计算l_opt，所以要把q_sum_opt和v再增加一个agent维
q_sum_opt = q_sum_opt.unsqueeze(-1).expand(-1, -1, self.n_agents)
v = v.unsqueeze(-1).expand(-1, -1, self.n_agents)
opt_error = q_sum_opt - joint_q_opt_evals.detach(
) + v # 计算l_opt时需要将joint_q_opt_evals固定
l_opt = ((opt_error * mask)**2).sum() / mask.sum()
# ---------------------------------------------L_opt------------------------------------------------------------
# ---------------------------------------------L_nopt-----------------------------------------------------------
# 因为L_nopt约束的是当前agent所有可执行的动作中，对应的最小的d，为了让不能执行的动作不影响d的计算，将不能执行的动作对应的q变大
individual_q_evals[avail_u == 0.0] = 999999
# 得到agent_i之外的其他agent的执行动作的Q值之和q_other_sum
# 1. 先得到每个agent的执行动作的Q值q_all,(episode个数, max_episode_len, n_agents， 1)
q_all_chosen = torch.gather(individual_q_evals, dim=-1, index=u)
# 2. 把q_all最后一个维度上当前agent的Q值变成所有agent的Q值，(episode个数, max_episode_len, n_agents, n_agents)
q_all_chosen = q_all_chosen.view((episode_num, max_episode_len, 1,
-1)).repeat(1, 1, self.n_agents, 1)
q_mask = (1 - torch.eye(self.n_agents)).unsqueeze(0).unsqueeze(0)
if self.args.cuda:
q_mask = q_mask.cuda()
q_other_chosen = q_all_chosen * q_mask # 把每个agent自己的Q值置为0，从而才能相加得到其他agent的Q值之和
# 3. 求和，同时由于对于当前agent的每个动作，都要和q_other_sum相加，所以把q_other_sum扩展出n_actions维度
q_other_sum = q_other_chosen.sum(dim=-1, keepdim=True).repeat(
1, 1, 1, self.n_actions)
# 当前agent的每个动作的Q和其他agent执行动作的Q相加，得到D中的第一项
q_sum_nopt = individual_q_evals + q_other_sum
# 因为joint_q_evals的维度是(episode个数,max_episode_len,n_agents,n_actions)，所以要对v扩展出一个n_actions维度
v = v.unsqueeze(-1).expand(-1, -1, -1, self.n_actions)
d = q_sum_nopt - joint_q_evals.detach(
) + v # 计算l_nopt时需要将qtran_q_evals固定
d = d.min(dim=-1)[0]
l_nopt = ((d * mask)**2).sum() / mask.sum()
# ---------------------------------------------L_nopt-----------------------------------------------------------
# print('l_td is {}, l_opt is {}, l_nopt is {}'.format(l_td, l_opt, l_nopt))
loss = l_td + self.args.lambda_opt * l_opt + self.args.lambda_nopt * l_nopt
# loss = l_td + self.args.lambda_opt * l_opt
self.optimizer.zero_grad()
loss.backward()
torch.nn.utils.clip_grad_norm_(self.eval_parameters,
self.args.grad_norm_clip)
self.optimizer.step()
if train_step > 0 and train_step % self.args.target_update_cycle == 0:
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_joint_q.load_state_dict(self.eval_joint_q.state_dict())
def _get_individual_q(self, batch, max_episode_len):
episode_num = batch['o'].shape[0]
q_evals, q_targets, hidden_evals, hidden_targets = [], [], [], []
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_individual_inputs(
batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
self.eval_hidden = self.eval_hidden.cuda()
inputs_next = inputs_next.cuda()
self.target_hidden = self.target_hidden.cuda()
q_eval, self.eval_hidden = self.eval_rnn(inputs, self.eval_hidden)
q_target, self.target_hidden = self.target_rnn(
inputs_next, self.target_hidden)
hidden_eval, hidden_target = self.eval_hidden.clone(
), self.target_hidden.clone()
# 把q_eval维度重新变回(8, 5,n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_target = q_target.view(episode_num, self.n_agents, -1)
hidden_eval = hidden_eval.view(episode_num, self.n_agents, -1)
hidden_target = hidden_target.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
q_targets.append(q_target)
hidden_evals.append(hidden_eval)
hidden_targets.append(hidden_target)
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_evals = torch.stack(q_evals, dim=1)
q_targets = torch.stack(q_targets, dim=1)
hidden_evals = torch.stack(hidden_evals, dim=1)
hidden_targets = torch.stack(hidden_targets, dim=1)
return q_evals, q_targets, hidden_evals, hidden_targets
def _get_individual_inputs(self, batch, transition_idx):
# 取出所有episode上该transition_idx的经验，u_onehot要取出所有，因为要用到上一条
obs, obs_next, u_onehot = batch['o'][:, transition_idx], \
batch['o_next'][:, transition_idx], batch['u_onehot'][:]
episode_num = obs.shape[0]
inputs, inputs_next = [], []
inputs.append(obs)
inputs_next.append(obs_next)
# 给obs添加上一个动作、agent编号
if self.args.last_action:
if transition_idx == 0: # 如果是第一条经验，就让前一个动作为0向量
inputs.append(torch.zeros_like(u_onehot[:, transition_idx]))
else:
inputs.append(u_onehot[:, transition_idx - 1])
inputs_next.append(u_onehot[:, transition_idx])
if self.args.reuse_network:
# 因为当前的obs三维的数据，每一维分别代表(episode编号，agent编号，obs维度)，直接在dim_1上添加对应的向量
# 即可，比如给agent_0后面加(1, 0, 0, 0, 0)，表示5个agent中的0号。而agent_0的数据正好在第0行，那么需要加的
# agent编号恰好就是一个单位矩阵，即对角线为1，其余为0
inputs.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
inputs_next.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
# 要把obs中的三个拼起来，并且要把episode_num个episode、self.args.n_agents个agent的数据拼成40条(40,96)的数据，
# 因为这里所有agent共享一个神经网络，每条数据中带上了自己的编号，所以还是自己的数据
inputs = torch.cat(
[x.reshape(episode_num * self.args.n_agents, -1) for x in inputs],
dim=1)
inputs_next = torch.cat([
x.reshape(episode_num * self.args.n_agents, -1)
for x in inputs_next
],
dim=1)
return inputs, inputs_next
def get_qtran(self,
batch,
local_opt_actions,
hidden_evals,
hidden_targets=None,
hat=False):
episode_num, max_episode_len, _, _ = hidden_evals.shape
s = batch['s'][:, :max_episode_len]
s_next = batch['s_next'][:, :max_episode_len]
u_onehot = batch['u_onehot'][:, :max_episode_len]
v_state = s.clone()
# s和s_next没有n_agents维度，每个agent的joint_q网络都需要, 所以要把s转化成四维
s = s.unsqueeze(-2).expand(-1, -1, self.n_agents, -1)
s_next = s_next.unsqueeze(-2).expand(-1, -1, self.n_agents, -1)
# 添加agent编号对应的one-hot向量
'''
因为当前的inputs三维的数据，每一维分别代表(episode编号，agent编号，inputs维度)，直接在后面添加对应的向量
即可，比如给agent_0后面加(1, 0, 0, 0, 0)，表示5个agent中的0号。而agent_0的数据正好在第0行，那么需要加的
agent编号恰好就是一个单位矩阵，即对角线为1，其余为0
'''
action_onehot = torch.eye(
self.n_agents).unsqueeze(0).unsqueeze(0).expand(
episode_num, max_episode_len, -1, -1)
s_eval = torch.cat([s, action_onehot], dim=-1)
s_target = torch.cat([s_next, action_onehot], dim=-1)
if self.args.cuda:
s_eval = s_eval.cuda()
s_target = s_target.cuda()
v_state = v_state.cuda()
u_onehot = u_onehot.cuda()
hidden_evals = hidden_evals.cuda()
hidden_targets = hidden_targets.cuda()
local_opt_actions = local_opt_actions.cuda()
if hat:
# 神经网络输出的q_eval、q_target的维度为(episode_num * max_episode_len * n_agents, n_actions)
q_evals = self.eval_joint_q(s_eval, hidden_evals,
local_opt_actions)
q_targets = None
v = None
# 把q_eval维度变回(episode_num, max_episode_len, n_agents, n_actions)
q_evals = q_evals.view(episode_num, max_episode_len, -1,
self.n_actions)
else:
q_evals = self.eval_joint_q(s_eval, hidden_evals, u_onehot)
q_targets = self.target_joint_q(s_target, hidden_targets,
local_opt_actions)
v = self.v(v_state, hidden_evals)
# 把q_eval、q_target维度变回(episode_num, max_episode_len, n_agents, n_actions)
q_evals = q_evals.view(episode_num, max_episode_len, -1,
self.n_actions)
q_targets = q_targets.view(episode_num, max_episode_len, -1,
self.n_actions)
# 把v维度变回(episode_num, max_episode_len)
v = v.view(episode_num, -1)
return q_evals, q_targets, v
def init_hidden(self, episode_num):
# 为每个episode中的每个agent都初始化一个eval_hidden、target_hidden
self.eval_hidden = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.target_hidden = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
def save_model(self, train_step):
num = str(train_step // self.args.save_cycle)
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
torch.save(self.eval_rnn.state_dict(),
self.model_dir + '/' + num + '_rnn_net_params.pkl')
torch.save(self.eval_joint_q.state_dict(),
self.model_dir + '/' + num + '_joint_q_params.pkl')
torch.save(self.v.state_dict(),
self.model_dir + '/' + num + '_v_params.pkl')
class QTran:
def __init__(self, args, itr):
self.n_actions = args.n_actions
self.n_agents = args.n_agents
self.state_shape = args.state_shape
self.obs_shape = args.obs_shape
self.args = args
rnn_input_shape = self.obs_shape
# 根据参数决定RNN的输入维度
if args.last_action:
rnn_input_shape += self.n_actions # 当前agent的上一个动作的one_hot向量
if args.reuse_network:
rnn_input_shape += self.n_agents
# 神经网络
self.eval_rnn = RNN(rnn_input_shape, args) # 每个agent选动作的网络
self.target_rnn = RNN(rnn_input_shape, args)
# self.eval_joint_q = QtranQBase(args) # Joint action-value network
# self.target_joint_q = QtranQBase(args)
# 默认值分解算法使用 qtran_base
if self.args.alg == 'qtran_base':
self.eval_joint_q = QtranQBase(args)
self.target_joint_q = QtranQBase(args)
elif self.args.alg == 'qtran_alt':
# self.mixer = QTranAlt(args)
# self.target_mixer = QTranAlt(args)
raise Exception("Not supported yet.")
else:
raise Exception('QTRAN只有qtran_base！')
self.v = QtranV(args)
if self.args.cuda:
self.eval_rnn.cuda()
self.target_rnn.cuda()
self.eval_joint_q.cuda()
self.target_joint_q.cuda()
self.v.cuda()
# self.model_dir = args.model_dir + '/' + args.alg + '/' + args.map + '/' + str(itr)
# self.model_dir = args.model_dir + '/' + args.map + '/' + args.alg + '_' + str(self.args.epsilon_anneal_steps // 10000) + 'w' + '/' + str(itr)
# 如果存在模型则加载模型
if self.args.load_model:
if os.path.exists(self.args.model_dir + '/rnn_net_params.pkl'):
path_rnn = self.args.model_dir + '/rnn_net_params.pkl'
path_joint_q = self.args.model_dir + '/joint_q_params.pkl'
path_v = self.args.model_dir + '/v_params.pkl'
map_location = 'cuda:0' if self.args.cuda else 'cpu'
self.eval_rnn.load_state_dict(torch.load(path_rnn, map_location=map_location))
self.eval_joint_q.load_state_dict(torch.load(path_joint_q, map_location=map_location))
self.v.load_state_dict(torch.load(path_v, map_location=map_location))
print('Successfully load the model: {}, {} and {}'.format(path_rnn, path_joint_q, path_v))
else:
raise Exception("No model!")
# 让target_net和eval_net的网络参数相同
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_joint_q.load_state_dict(self.eval_joint_q.state_dict())
self.eval_parameters = list(self.eval_joint_q.parameters()) + \
list(self.v.parameters()) + \
list(self.eval_rnn.parameters())
if args.optim == "RMS":
self.optimizer = torch.optim.RMSprop(self.eval_parameters, lr=args.lr)
# 执行过程中，要为每个agent都维护一个eval_hidden
# 学习过程中，要为每个episode的每个agent都维护一个eval_hidden、target_hidden
self.eval_hidden = None
self.target_hidden = None
print('Init alg QTRAN-base')
def learn(self, batch, max_episode_len, train_step, epsilon=None): # train_step表示是第几次学习，用来控制更新target_net网络的参数
'''
在learn的时候，抽取到的数据是四维的，四个维度分别为 1——第几个episode 2——episode中第几个transition
3——第几个agent的数据 4——具体obs维度。因为在选动作时不仅需要输入当前的inputs，还要给神经网络输入hidden_state，
hidden_state和之前的经验相关，因此就不能随机抽取经验进行学习。所以这里一次抽取多个episode，然后一次给神经网络
传入每个episode的同一个位置的transition
'''
episode_num = batch['o'].shape[0]
self.init_hidden(episode_num)
# for key in batch.keys(): # 把batch里的数据转化成tensor
# if key == 'u':
# batch[key] = torch.tensor(batch[key], dtype=torch.long)
# else:
# batch[key] = torch.tensor(batch[key], dtype=torch.float32)
# 数据转为tensor
for key in batch.keys():
if key == 'a':
batch[key] = torch.LongTensor(batch[key])
else:
batch[key] = torch.Tensor(batch[key])
u, r, avail_u, avail_u_next, terminated = batch['a'], batch['r'], batch['avail_a'], \
batch['next_avail_a'], batch['done']
mask = (1 - batch["padded"].float()).squeeze(-1) # 用来把那些填充的经验的TD-error置0，从而不让它们影响到学习
if self.args.cuda:
u = u.cuda()
r = r.cuda()
avail_u = avail_u.cuda()
avail_u_next = avail_u_next.cuda()
terminated = terminated.cuda()
mask = mask.cuda()
# 得到每个agent对应的Q和hidden_states，维度为(episode个数, max_episode_len， n_agents， n_actions/hidden_dim)
individual_q_evals, individual_q_targets, hidden_evals, hidden_targets = self._get_individual_q(batch, max_episode_len)
# 得到当前时刻和下一时刻每个agent的局部最优动作及其one_hot表示
individual_q_clone = individual_q_evals.clone()
individual_q_clone[avail_u == 0.0] = - 999999
individual_q_targets[avail_u_next == 0.0] = - 999999
opt_onehot_eval = torch.zeros(*individual_q_clone.shape)
opt_action_eval = individual_q_clone.argmax(dim=3, keepdim=True)
opt_onehot_eval = opt_onehot_eval.scatter(-1, opt_action_eval[:, :].cpu(), 1)
opt_onehot_target = torch.zeros(*individual_q_targets.shape)
opt_action_target = individual_q_targets.argmax(dim=3, keepdim=True)
opt_onehot_target = opt_onehot_target.scatter(-1, opt_action_target[:, :].cpu(), 1)
# ---------------------------------------------L_td-------------------------------------------------------------
# 计算joint_q和v
# joint_q、v的维度为(episode个数, max_episode_len, 1), 而且joint_q在后面的l_nopt还要用到
joint_q_evals, joint_q_targets, v = self.get_qtran(batch, hidden_evals, hidden_targets, opt_onehot_target)
# loss
y_dqn = r.squeeze(-1) + self.args.gamma * joint_q_targets * (1 - terminated.squeeze(-1))
td_error = joint_q_evals - y_dqn.detach()
l_td = ((td_error * mask) ** 2).sum() / mask.sum()
# ---------------------------------------------L_td-------------------------------------------------------------
# ---------------------------------------------L_opt------------------------------------------------------------
# 将局部最优动作的Q值相加
# 这里要使用individual_q_clone，它把不能执行的动作Q值改变了，使用individual_q_evals可能会使用不能执行的动作的Q值
q_sum_opt = individual_q_clone.max(dim=-1)[0].sum(dim=-1) # (episode个数, max_episode_len)
# 重新得到joint_q_hat_opt，它和joint_q_evals的区别是前者输入的动作是局部最优动作，后者输入的动作是执行的动作
# (episode个数, max_episode_len)
joint_q_hat_opt, _, _ = self.get_qtran(batch, hidden_evals, hidden_targets, opt_onehot_eval, hat=True)
opt_error = q_sum_opt - joint_q_hat_opt.detach() + v # 计算l_opt时需要将joint_q_hat_opt固定
l_opt = ((opt_error * mask) ** 2).sum() / mask.sum()
# ---------------------------------------------L_opt------------------------------------------------------------
# ---------------------------------------------L_nopt-----------------------------------------------------------
# 每个agent的执行动作的Q值,(episode个数, max_episode_len, n_agents, 1)
q_individual = torch.gather(individual_q_evals, dim=-1, index=u).squeeze(-1)
q_sum_nopt = q_individual.sum(dim=-1) # (episode个数, max_episode_len)
nopt_error = q_sum_nopt - joint_q_evals.detach() + v # 计算l_nopt时需要将joint_q_evals固定
nopt_error = nopt_error.clamp(max=0)
l_nopt = ((nopt_error * mask) ** 2).sum() / mask.sum()
# ---------------------------------------------L_nopt-----------------------------------------------------------
# print('l_td is {}, l_opt is {}, l_nopt is {}'.format(l_td, l_opt, l_nopt))
loss = l_td + self.args.lambda_opt * l_opt + self.args.lambda_nopt * l_nopt
# loss = l_td + self.args.lambda_opt * l_opt
self.optimizer.zero_grad()
loss.backward()
torch.nn.utils.clip_grad_norm_(self.eval_parameters, self.args.clip_norm)
self.optimizer.step()
if train_step > 0 and train_step % self.args.target_update_period == 0:
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_joint_q.load_state_dict(self.eval_joint_q.state_dict())
def _get_individual_q(self, batch, max_episode_len):
episode_num = batch['o'].shape[0]
q_evals, q_targets, hidden_evals, hidden_targets = [], [], [], []
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_individual_inputs(batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
# 要用第一条经验把target网络的hidden_state初始化好，直接用第二条经验传入target网络不对
if transition_idx == 0:
_, self.target_hidden = self.target_rnn(inputs, self.eval_hidden)
q_eval, self.eval_hidden = self.eval_rnn(inputs, self.eval_hidden) # inputs维度为(40,96)，得到的q_eval维度为(40,n_actions)
q_target, self.target_hidden = self.target_rnn(inputs_next, self.target_hidden)
hidden_eval, hidden_target = self.eval_hidden.clone(), self.target_hidden.clone()
# 把q_eval维度重新变回(8, 5,n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_target = q_target.view(episode_num, self.n_agents, -1)
hidden_eval = hidden_eval.view(episode_num, self.n_agents, -1)
hidden_target = hidden_target.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
q_targets.append(q_target)
hidden_evals.append(hidden_eval)
hidden_targets.append(hidden_target)
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_evals = torch.stack(q_evals, dim=1)
q_targets = torch.stack(q_targets, dim=1)
hidden_evals = torch.stack(hidden_evals, dim=1)
hidden_targets = torch.stack(hidden_targets, dim=1)
return q_evals, q_targets, hidden_evals, hidden_targets
def _get_individual_inputs(self, batch, transition_idx):
# 取出所有episode上该transition_idx的经验，u_onehot要取出所有，因为要用到上一条
obs, obs_next, u_onehot = batch['o'][:, transition_idx], \
batch['next_o'][:, transition_idx], batch['onehot_a'][:]
episode_num = obs.shape[0]
inputs, inputs_next = [], []
inputs.append(obs)
inputs_next.append(obs_next)
# 给obs添加上一个动作、agent编号
if self.args.last_action:
if transition_idx == 0: # 如果是第一条经验，就让前一个动作为0向量
inputs.append(torch.zeros_like(u_onehot[:, transition_idx]))
else:
inputs.append(u_onehot[:, transition_idx - 1])
inputs_next.append(u_onehot[:, transition_idx])
if self.args.reuse_network:
# 因为当前的obs三维的数据，每一维分别代表(episode编号，agent编号，obs维度)，直接在dim_1上添加对应的向量
# 即可，比如给agent_0后面加(1, 0, 0, 0, 0)，表示5个agent中的0号。而agent_0的数据正好在第0行，那么需要加的
# agent编号恰好就是一个单位矩阵，即对角线为1，其余为0
inputs.append(torch.eye(self.args.n_agents).unsqueeze(0).expand(episode_num, -1, -1))
inputs_next.append(torch.eye(self.args.n_agents).unsqueeze(0).expand(episode_num, -1, -1))
# 要把obs中的三个拼起来，并且要把episode_num个episode、self.args.n_agents个agent的数据拼成40条(40,96)的数据，
# 因为这里所有agent共享一个神经网络，每条数据中带上了自己的编号，所以还是自己的数据
inputs = torch.cat([x.reshape(episode_num * self.args.n_agents, -1) for x in inputs], dim=1)
inputs_next = torch.cat([x.reshape(episode_num * self.args.n_agents, -1) for x in inputs_next], dim=1)
return inputs, inputs_next
def get_qtran(self, batch, hidden_evals, hidden_targets, local_opt_actions, hat=False):
episode_num, max_episode_len, _, _ = hidden_targets.shape
states = batch['s'][:, :max_episode_len]
states_next = batch['next_s'][:, :max_episode_len]
u_onehot = batch['onehot_a'][:, :max_episode_len]
if self.args.cuda:
states = states.cuda()
states_next = states_next.cuda()
u_onehot = u_onehot.cuda()
hidden_evals = hidden_evals.cuda()
hidden_targets = hidden_targets.cuda()
local_opt_actions = local_opt_actions.cuda()
if hat:
# 神经网络输出的q_eval、q_target、v的维度为(episode_num * max_episode_len, 1)
q_evals = self.eval_joint_q(states, hidden_evals, local_opt_actions)
q_targets = None
v = None
# 把q_eval维度变回(episode_num, max_episode_len)
q_evals = q_evals.view(episode_num, -1, 1).squeeze(-1)
else:
q_evals = self.eval_joint_q(states, hidden_evals, u_onehot)
q_targets = self.target_joint_q(states_next, hidden_targets, local_opt_actions)
v = self.v(states, hidden_evals)
# 把q_eval、q_target、v维度变回(episode_num, max_episode_len)
q_evals = q_evals.view(episode_num, -1, 1).squeeze(-1)
q_targets = q_targets.view(episode_num, -1, 1).squeeze(-1)
v = v.view(episode_num, -1, 1).squeeze(-1)
return q_evals, q_targets, v
def init_hidden(self, episode_num):
# 为每个episode中的每个agent都初始化一个eval_hidden、target_hidden
self.eval_hidden = torch.zeros((episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.target_hidden = torch.zeros((episode_num, self.n_agents, self.args.rnn_hidden_dim))
def save_model(self, train_step):
# num = str(train_step // self.args.save_cycle)
# if not os.path.exists(self.model_dir):
# os.makedirs(self.model_dir)
if not os.path.exists(self.args.model_dir):
os.makedirs(self.args.model_dir)
if type(train_step) == str:
num = train_step
else:
num = str(train_step // self.args.save_model_period)
torch.save(self.eval_rnn.state_dict(), self.args.model_dir + '/' + num + '_rnn_net_params.pkl')
torch.save(self.eval_joint_q.state_dict(), self.args.model_dir + '/' + num + '_joint_q_params.pkl')
torch.save(self.v.state_dict(), self.args.model_dir + '/' + num + '_v_params.pkl')
class QMIX_PG():
def __init__(self, agent, args):
self.args = args
self.log_alpha = torch.zeros(
1, dtype=torch.float32) # , requires_grad=True)
if args.cuda:
self.log_alpha = self.log_alpha.cuda()
self.log_alpha.requires_grad = True
self.alpha = self.args.alpha
self.alpha_optimizer = torch.optim.Adam([self.log_alpha], lr=3e-4)
self.agent = agent
# self.target_policy = copy.deepcopy(self.agent.policy) # TODO
self.policy_params = list(agent.policy.parameters())
self.policy_optimiser = torch.optim.RMSprop(
params=self.policy_params,
lr=args.actor_lr) # , alpha=args.optim_alpha, eps=args.optim_eps)
self.n_actions = args.n_actions
self.n_agents = args.n_agents
self.state_shape = args.state_shape
self.obs_shape = args.obs_shape
input_shape = self.obs_shape
# 根据参数决定RNN的输入维度
if args.last_action:
input_shape += self.n_actions
if args.reuse_network:
input_shape += self.n_agents
# 神经网络
self.eval_rnn = RNN(input_shape, args) # 每个agent选动作的网络
self.target_rnn = RNN(input_shape, args)
self.eval_rnn_2 = RNN(input_shape, args) # 每个agent选动作的网络
self.target_rnn_2 = RNN(input_shape, args)
self.eval_qmix_net = QMixNet(args) # 把agentsQ值加起来的网络
self.target_qmix_net = QMixNet(args)
self.eval_qmix_net_2 = QMixNet(args) # 把agentsQ值加起来的网络
self.target_qmix_net_2 = QMixNet(args)
self.args = args
if self.args.cuda:
self.eval_rnn.cuda()
self.target_rnn.cuda()
self.eval_rnn_2.cuda()
self.target_rnn_2.cuda()
self.eval_qmix_net.cuda()
self.target_qmix_net.cuda()
self.eval_qmix_net_2.cuda()
self.target_qmix_net_2.cuda()
# self.model_dir = args.model_dir + '/' + args.alg + '/' + args.map
tmp = f'clamp2-5_rewardscale10_' + f'{args.buffer_size}_{args.actor_buffer_size}_{args.critic_buffer_size}_{args.actor_train_steps}_{args.critic_train_steps}_' \
f'{args.actor_update_delay}_{args.critic_lr}'
self.model_dir = args.model_dir + '/linear_mix/' + 'qmix_sac_cf' + '/' + tmp + '/' + args.map # _gradclip0.5
# 如果存在模型则加载模型
if self.args.load_model:
if os.path.exists(self.model_dir + '/rnn_net_params.pkl'):
path_rnn = self.model_dir + '/rnn_net_params.pkl'
path_qmix = self.model_dir + '/qmix_net_params.pkl'
path_policy = self.model_dir + '/policy_net_params.pkl'
map_location = 'cuda:0' if self.args.cuda else 'cpu'
self.eval_rnn.load_state_dict(
torch.load(path_rnn, map_location=map_location))
self.eval_rnn_2.load_state_dict(
torch.load(path_rnn, map_location=map_location))
self.eval_qmix_net.load_state_dict(
torch.load(path_qmix, map_location=map_location))
self.eval_qmix_net_2.load_state_dict(
torch.load(path_qmix, map_location=map_location))
# self.target_policy.load_state_dict(torch.load(path_policy, map_location=map_location)) # TODO
print('Successfully load the model: {} and {}'.format(
path_rnn, path_qmix))
else:
raise Exception("No model!")
# 让target_net和eval_net的网络参数相同
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_rnn_2.load_state_dict(self.eval_rnn.state_dict())
self.target_qmix_net.load_state_dict(self.eval_qmix_net.state_dict())
self.target_qmix_net_2.load_state_dict(
self.eval_qmix_net_2.state_dict())
# self.target_policy.load_state_dict(self.agent.policy.state_dict()) # TODO
self.eval_parameters = list(self.eval_qmix_net.parameters()) + list(
self.eval_rnn.parameters())
if args.optimizer == "RMS":
self.optimizer = torch.optim.RMSprop(self.eval_parameters,
lr=args.critic_lr)
self.eval_parameters_2 = list(
self.eval_qmix_net_2.parameters()) + list(
self.eval_rnn_2.parameters())
if args.optimizer == "RMS":
self.optimizer_2 = torch.optim.RMSprop(self.eval_parameters_2,
lr=args.critic_lr)
# 执行过程中，要为每个agent都维护一个eval_hidden
# 学习过程中，要为每个episode的每个agent都维护一个eval_hidden、target_hidden
self.eval_hidden = None
self.target_hidden = None
print('Init alg QMIX')
def train_actor(self,
batch,
max_episode_len,
actor_sample_times=1): # EpisodeBatch
episode_num = batch['o'].shape[0]
self.init_hidden(episode_num)
for key in batch.keys(): # 把batch里的数据转化成tensor
if key == 'u':
batch[key] = torch.tensor(batch[key], dtype=torch.long)
else:
batch[key] = torch.tensor(batch[key], dtype=torch.float32)
# s, s_next, u, r, avail_u, avail_u_next, terminated = batch['s'], batch['s_next'], batch['u'], \
# batch['r'], batch['avail_u'], batch['avail_u_next'], \
# batch['terminated']
s = batch['s']
terminated = batch['terminated']
mask = 1 - batch["padded"].float() # 用来把那些填充的经验的TD-error置0，从而不让它们影响到学习
mask[:, 1:] = mask[:, 1:] * (1 - terminated[:, :-1])
mask = mask.repeat(1, 1, self.n_agents).view(-1)
# mask = mask.repeat(1, 1, self.n_agents)
# actions = batch["u"][:, :-1]
actions = batch["u"]
avail_u = batch["avail_u"]
# terminated = batch["terminated"][:, :-1].float()
# avail_actions = batch["avail_u"][:, :-1]
if self.args.cuda:
s = s.cuda()
# u = u.cuda()
# r = r.cuda()
# s_next = s_next.cuda()
# terminated = terminated.cuda()
actions = actions.cuda()
avail_u = avail_u.cuda()
mask = mask.cuda()
# # build q
# inputs = self.critic._build_inputs(batch, bs, max_t)
# q_vals = self.critic.forward(inputs).detach()[:, :-1]
episode_num = batch['o'].shape[0]
q_evals, q_targets = [], []
actions_prob = []
actions_logprobs = []
actions_probs_nozero = []
# self.agent.init_hidden(batch.batch_size)
# self.policy_hidden= self.policy.init_hidden().unsqueeze(0).expand(batch_size, self.n_agents, -1) # bav
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(
batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
self.eval_hidden = self.eval_hidden.cuda()
q_eval, self.eval_hidden = self.eval_rnn(
inputs, self.eval_hidden
) # inputs维度为(40,96)，得到的q_eval维度为(40,n_actions) Q_i
# 把q_eval维度重新变回(8, 5,n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
agent_outs, self.policy_hidden = self.agent.policy(
inputs, self.policy_hidden)
avail_actions_ = avail_u[:, transition_idx]
reshaped_avail_actions = avail_actions_.reshape(
episode_num * self.n_agents, -1)
agent_outs[reshaped_avail_actions == 0] = -1e11
# agent_outs = torch.nn.functional.softmax(agent_outs, dim=-1)
# agent_outs = gumbel_softmax(agent_outs, hard=False)
agent_outs = F.softmax(agent_outs / 1, dim=1) # 概率分布
# If hard=True, then the returned sample will be one-hot, otherwise it will
# be a probabilitiy distribution that sums to 1 across classes
agent_outs = agent_outs.view(episode_num, self.n_agents, -1)
actions_prob.append(agent_outs) # 每个动作的概率
# actions_prob_nozero = agent_outs.clone()
# actions_prob_nozero[reshaped_avail_actions.view(episode_num, self.n_agents, -1) == 0] = 1e-11 # # TODO 概率没有0
# actions_probs_nozero.append(actions_prob_nozero)
# Have to deal with situation of 0.0 probabilities because we can't do log 0
z = agent_outs == 0.0
z = z.float() * 1e-8
actions_logprobs.append(torch.log(agent_outs + z))
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_vals = torch.stack(q_evals, dim=1)
actions_prob = torch.stack(actions_prob, dim=1) # Concat over time
log_prob_pi = torch.stack(actions_logprobs, dim=1)
# cur_pol_sample_actions = np.random.choice(np.arange(self.n_actions), 1,
# p=actions_prob.detach().cpu().numpy()) # action是一个整数 按概率分布采样
# actor_sample_times=1
# for i in range(actor_sample_times):
# todo
actor_sample_times = 1
samples = torch.multinomial(
actions_prob.view(-1, self.n_actions),
actor_sample_times,
replacement=True) # a.shape = (batch_size, num_a)
cur_pol_sample_actions = samples.view(
episode_num, -1, self.n_agents,
actor_sample_times) # max_episode_len
#### actor_sample_times=1
q_curpi_sample_actions = torch.gather(
q_vals, dim=3, index=cur_pol_sample_actions).squeeze(3) # (1,60,3)
#### actor_sample_times
# q_curpi_sample_actions = torch.gather(q_vals, dim=3,index=cur_pol_sample_actions) # (1,60,3) todo actor_sample_times
# q_curpi_sample_actions = q_curpi_sample_actions.permute(3, 0, 1, 2).reshape(-1, max_episode_len, self.n_agents) # todo actor_sample_times
# s = s.repeat(repeats=(actor_sample_times, 1, 1)) # (1,60,3) todo actor_sample_times
# mask = mask.repeat(repeats=(actor_sample_times, 1, 1)).view(-1) # (1,60,3) todo actor_sample_times
q_curpi_sample = self.eval_qmix_net(q_curpi_sample_actions,
s).detach() # TODO # (1,60,1)
Q_curpi_sample = q_curpi_sample.repeat(
repeats=(1, 1, self.n_agents)) # (1,60,3)
# q_targets_mean = torch.sum(actions_prob * q_vals, dim=-1).view(-1).detach() # (180)
# q_i_mean_negi_mean = torch.sum(actions_prob * (-self.alpha * log_prob_pi + q_vals), dim=-1) # (1,60,3) # TODO
q_i_mean_negi_mean = torch.sum(actions_prob * q_vals,
dim=-1) # (1,60,3) # TODO
# q_i_mean_negi_mean = q_i_mean_negi_mean.repeat(repeats=(actor_sample_times, 1, 1)) # todo actor_sample_times
q_i_mean_negi_sample = []
# torch.stack( [torch.cat((q_targets_mean[:, :, i].unsqueeze(2), torch.cat((q_taken[:, :, :i], q_taken[:, :, i + 1:]), dim=2)),
# dim=2) for i in range(3)],dim=1) # 顺序不对
q_curpi_sample_actions_detached = q_curpi_sample_actions.detach()
for i in range(self.n_agents):
q_temp = copy.deepcopy(q_curpi_sample_actions_detached)
q_temp[:, :,
i] = q_i_mean_negi_mean[:, :,
i] # q_i(mean_action) q_-i(tacken_action),
q_i_mean_negi_sample.append(q_temp)
q_i_mean_negi_sample = torch.stack(q_i_mean_negi_sample,
dim=2) # [1, 60, 3, 3]
q_i_mean_negi_sample = q_i_mean_negi_sample.view(
episode_num, -1, self.n_agents) # [1, 60*3, 3]
# s_repeat = s.repeat(repeats=(1, self.n_agents, 1)) # (1,60,48)-> # (1,60*3,48) #TODO 顺序错误
s_repeat = s.repeat(
repeats=(1, 1, self.n_agents)) # (1,60,48)-> # (1,60,48*3)
# s_repeat = s_repeat.view(episode_num, self.n_agents, -1) # (1,60,48*3)-> # (1,3,48*60)#TODO 一样的
s_repeat = s_repeat.view(
episode_num, self.n_agents * max_episode_len,
self.args.state_shape) # (1,60,48*3)-> # (1,60*3,48)#
Q_i_mean_negi_sample = self.eval_qmix_net(
q_i_mean_negi_sample, s_repeat).detach() # TODO # (1,60*3,1)
# q_total_target = q_total_target.repeat(repeats=(1, 1, self.n_agents)) # (1,60,3)
Q_i_mean_negi_sample = Q_i_mean_negi_sample.view(
episode_num, -1, self.n_agents) # (1,60*3,1)->(1,60,3)
###方法1
# pi = actions_prob.view(-1, self.n_actions)
# # Calculate policy grad with mask
# pi_sample = torch.gather(pi, dim=1, index=cur_pol_sample_actions.reshape(-1, 1)).squeeze(1)
# pi_sample[mask == 0] = 1.0
# log_pi_sample = torch.log(pi_sample)
###方法2
log_pi_sample = torch.gather(
log_prob_pi, dim=3,
index=cur_pol_sample_actions).squeeze(-1).view(-1)
# advantages = (-self.alpha * log_pi_sample + (Q_curpi_sample.view(-1) - Q_i_mean_negi_sample.view(-1)).detach()) # TODO Bug?
advantages = (-self.alpha * log_pi_sample + Q_curpi_sample.view(-1) -
Q_i_mean_negi_sample.view(-1)).detach() # TODO
# if self.args.advantage_norm: # TODO
# EPS = 1e-10
# advantages = (advantages - advantages.mean()) / (advantages.std() + EPS)
policy_loss = -((advantages * log_pi_sample) * mask).sum() / mask.sum()
# Optimise agents
self.policy_optimiser.zero_grad()
# don't want critic to accumulate gradients from policy loss
disable_gradients(self.eval_rnn)
disable_gradients(self.eval_qmix_net)
policy_loss.backward() # policy gradient
enable_gradients(self.eval_rnn)
enable_gradients(self.eval_qmix_net)
grad_norm = torch.nn.utils.clip_grad_norm_(
self.policy_params, self.args.grad_norm_clip) # 0.5 todo
self.policy_optimiser.step()
# compute parameters sum for debugging
p_sum = 0.
for p in self.policy_params:
p_sum += p.data.abs().sum().item() / 100.0
self.soft_update()
def train_critic(self,
batch,
max_episode_len,
train_step,
epsilon=None): # train_step表示是第几次学习，用来控制更新target_net网络的参数
'''
在learn的时候，抽取到的数据是四维的，四个维度分别为 1——第几个episode 2——episode中第几个transition
3——第几个agent的数据 4——具体obs维度。因为在选动作时不仅需要输入当前的inputs，还要给神经网络输入hidden_state，
hidden_state和之前的经验相关，因此就不能随机抽取经验进行学习。所以这里一次抽取多个episode，然后一次给神经网络
传入每个episode的同一个位置的transition
'''
episode_num = batch['o'].shape[0]
self.init_hidden(episode_num)
for key in batch.keys(): # 把batch里的数据转化成tensor
if key == 'u':
batch[key] = torch.tensor(batch[key], dtype=torch.long)
else:
batch[key] = torch.tensor(batch[key], dtype=torch.float32)
s, s_next, u, r, avail_u, avail_u_next, terminated = batch['s'], batch['s_next'], batch['u'], \
batch['r'], batch['avail_u'], batch['avail_u_next'], \
batch['terminated']
mask = 1 - batch["padded"].float() # 用来把那些填充的经验的TD-error置0，从而不让它们影响到学习
mask[:, 1:] = mask[:, 1:] * (1 - terminated[:, :-1])
mask = mask.repeat(1, 1, self.n_agents)
# r = 10. * (r - r.mean()) / (r.std() + 1e-6) # normalize with batch mean and std; plus a small number to prevent numerical problem
r = (r - r.mean()) / (r.std() + 1e-6) # todo
# 得到每个agent对应的Q值，维度为(episode个数, max_episode_len， n_agents， n_actions)
q_evals, q_targets = self.get_q_values(batch, max_episode_len)
q_evals_2, q_targets_2 = self.get_q_values_2(batch, max_episode_len)
if self.args.cuda:
s = s.cuda()
u = u.cuda()
r = r.cuda()
s_next = s_next.cuda()
terminated = terminated.cuda()
mask = mask.cuda()
# 取每个agent动作对应的Q值，并且把最后不需要的一维去掉，因为最后一维只有一个值了
q_evals = torch.gather(q_evals, dim=3, index=u).squeeze(3)
q_evals_2 = torch.gather(q_evals_2, dim=3, index=u).squeeze(3)
episode_num = batch['o'].shape[0]
q_targets_sample = []
actions_prob = []
actions_probs_nozero = []
actions_logprobs = []
# self.agent.init_hidden(batch.batch_size)
# self.policy_hidden= self.policy.init_hidden().unsqueeze(0).expand(batch_size, self.n_agents, -1) # bav
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(
batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
# agent_outs, self.target_policy_hidden = self.target_policy(inputs_next, self.target_policy_hidden)
agent_outs, self.policy_hidden = self.agent.policy(
inputs_next, self.policy_hidden)
avail_actions_ = avail_u[:, transition_idx]
reshaped_avail_actions = avail_actions_.reshape(
episode_num * self.n_agents, -1)
agent_outs[reshaped_avail_actions == 0] = -1e11
# agent_outs = gumbel_softmax(agent_outs, hard=True) # one-hot TODO ac_sample1
# agent_outs = agent_outs.view(episode_num, self.n_agents, -1) # (1,3,9)
# action_next = agent_outs.max(dim=2, keepdim=True)[1] # (1,3,1)
# # action_next = torch.nonzero(agent_outs).squeeze()
# actions_next_sample.append(action_next) # 选择动作的序号
# agent_outs = gumbel_softmax(agent_outs, hard=True) # 概率 TODO ac_mean
agent_outs = F.softmax(agent_outs / 1, dim=1) # 概率分布
agent_outs = agent_outs.view(episode_num, self.n_agents,
-1) # 概率有0
actions_prob.append(agent_outs) # 每个动作的概率
# actions_prob_nozero=agent_outs.clone()
# actions_prob_nozero[reshaped_avail_actions.view(episode_num, self.n_agents, -1) == 0] = 1e-11 # 概率没有0
# actions_probs_nozero.append(actions_prob_nozero)
# Have to deal with situation of 0.0 probabilities because we can't do log 0
z = agent_outs == 0.0
z = z.float() * 1e-8
actions_logprobs.append(torch.log(agent_outs + z))
actions_prob = torch.stack(actions_prob, dim=1) # Concat over time
log_prob_pi = torch.stack(actions_logprobs, dim=1) # Concat over time
# actions_probs_nozero = torch.stack(actions_probs_nozero, dim=1) # Concat over time
# actions_probs_nozero[mask == 0] = 1.0
# log_prob_pi = torch.log(actions_probs_nozero)
# Updating alpha wrt entropy
# alpha = 0.0 # trade-off between exploration (max entropy) and exploitation (max Q)
target_entropy = -1. * self.n_actions
if self.args.auto_entropy is True:
# alpha_loss = -(self.log_alpha * (log_prob + target_entropy).detach()).mean() #target_entropy=-2
alpha_loss = (torch.sum(actions_prob.detach() *
(-self.log_alpha *
(log_prob_pi + target_entropy).detach()),
dim=-1) * mask).sum() / mask.sum()
# print('alpha loss: ',alpha_loss)
self.alpha_optimizer.zero_grad()
alpha_loss.backward()
self.alpha_optimizer.step()
self.alpha = self.log_alpha.exp()
else:
self.alpha = 1.
alpha_loss = 0
# Calculated baseline
q_targets_sample = torch.sum(
actions_prob * (q_targets - self.alpha * log_prob_pi),
dim=-1).view(episode_num, max_episode_len,
-1).detach() # (1,60,3) TODO ac_mean
q_targets_sample_2 = torch.sum(
actions_prob * (q_targets_2 - self.alpha * log_prob_pi),
dim=-1).view(episode_num, max_episode_len, -1).detach() # (1,60,3)
# actions_next_sample = torch.stack(actions_next_sample, dim=1) # Concat over time # (1,60,3,1) TODO ac_sample1
# # q_targets_sample = q_targets[:,:,actions_next]
# q_targets_sample = torch.gather(q_targets, dim=3, index=actions_next_sample).squeeze(3) # (1,60,3)
q_total_eval = self.eval_qmix_net(q_evals, s) # [1, 60, 1]
q_total_target = self.target_qmix_net(q_targets_sample, s_next)
q_total_eval_2 = self.eval_qmix_net_2(q_evals_2, s) # [1, 60, 1]
q_total_target_2 = self.target_qmix_net_2(q_targets_sample_2, s_next)
q_total_target_min = torch.min(q_total_target, q_total_target_2)
q_total_target = q_total_target_min
targets = r + self.args.gamma * q_total_target * (1 - terminated)
### update q1
td_error = (q_total_eval - targets.detach())
masked_td_error = mask * td_error # 抹掉填充的经验的td_error
# 不能直接用mean，因为还有许多经验是没用的，所以要求和再比真实的经验数，才是真正的均值
loss = (masked_td_error**2).sum() / mask.sum()
self.optimizer.zero_grad()
loss.backward()
torch.nn.utils.clip_grad_norm_(self.eval_parameters,
self.args.grad_norm_clip)
self.optimizer.step()
### update q2
td_error_2 = (q_total_eval_2 - targets.detach())
masked_td_error_2 = mask * td_error_2 # 抹掉填充的经验的td_error
# 不能直接用mean，因为还有许多经验是没用的，所以要求和再比真实的经验数，才是真正的均值
loss_2 = (masked_td_error_2**2).sum() / mask.sum()
self.optimizer_2.zero_grad()
loss_2.backward()
torch.nn.utils.clip_grad_norm_(self.eval_parameters_2,
self.args.grad_norm_clip)
self.optimizer_2.step()
# if train_step > 0 and train_step % self.args.target_update_cycle == 0: # 200
# self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
# self.target_qmix_net.load_state_dict(self.eval_qmix_net.state_dict())
# self.target_policy.load_state_dict(self.agent.policy.state_dict()) #TODO
# Update the frozen target models
if train_step % 10000 == 0: # how often to save the model args.save_cycle = 5000
self.save_model(train_step) # TODO
def _get_inputs(self, batch, transition_idx):
# 取出所有episode上该transition_idx的经验，u_onehot要取出所有，因为要用到上一条
obs, obs_next, u_onehot = batch['o'][:, transition_idx], \
batch['o_next'][:, transition_idx], batch['u_onehot'][:]
episode_num = obs.shape[0]
inputs, inputs_next = [], []
inputs.append(obs)
inputs_next.append(obs_next)
# 给obs添加上一个动作、agent编号 30+9+3
if self.args.last_action:
if transition_idx == 0: # 如果是第一条经验，就让前一个动作为0向量
inputs.append(torch.zeros_like(u_onehot[:, transition_idx]))
else:
inputs.append(u_onehot[:, transition_idx - 1])
inputs_next.append(u_onehot[:, transition_idx])
if self.args.reuse_network:
# 因为当前的obs三维的数据，每一维分别代表(episode编号，agent编号，obs维度)，直接在dim_1上添加对应的向量
# 即可，比如给agent_0后面加(1, 0, 0, 0, 0)，表示5个agent中的0号。而agent_0的数据正好在第0行，那么需要加的
# agent编号恰好就是一个单位矩阵，即对角线为1，其余为0
inputs.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
inputs_next.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
# 要把obs中的三个拼起来，并且要把episode_num个episode、self.args.n_agents个agent的数据拼成40条(40,96)的数据，
# 因为这里所有agent共享一个神经网络，每条数据中带上了自己的编号，所以还是自己的数据
inputs = torch.cat(
[x.reshape(episode_num * self.args.n_agents, -1) for x in inputs],
dim=1)
inputs_next = torch.cat([
x.reshape(episode_num * self.args.n_agents, -1)
for x in inputs_next
],
dim=1)
return inputs, inputs_next # (3,42)
def get_q_values(self, batch, max_episode_len):
episode_num = batch['o'].shape[0]
q_evals, q_targets = [], []
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(
batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
q_eval, self.eval_hidden = self.eval_rnn(
inputs, self.eval_hidden
) # inputs维度为(40,96)，得到的q_eval维度为(40,n_actions)
q_target, self.target_hidden = self.target_rnn(
inputs_next, self.target_hidden)
# 把q_eval维度重新变回(8, 5,n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_target = q_target.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
q_targets.append(q_target)
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_evals = torch.stack(q_evals, dim=1)
q_targets = torch.stack(q_targets, dim=1)
return q_evals, q_targets
def get_q_values_2(self, batch, max_episode_len):
episode_num = batch['o'].shape[0]
q_evals, q_targets = [], []
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(
batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
q_eval, self.eval_hidden_2 = self.eval_rnn_2(
inputs, self.eval_hidden_2
) # inputs维度为(40,96)，得到的q_eval维度为(40,n_actions)
q_target, self.target_hidden_2 = self.target_rnn_2(
inputs_next, self.target_hidden_2)
# 把q_eval维度重新变回(8, 5,n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_target = q_target.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
q_targets.append(q_target)
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_evals = torch.stack(q_evals, dim=1)
q_targets = torch.stack(q_targets, dim=1)
return q_evals, q_targets
def init_hidden(self, episode_num):
# 为每个episode中的每个agent都初始化一个eval_hidden、target_hidden
self.eval_hidden = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.target_hidden = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.eval_hidden_2 = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.target_hidden_2 = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.policy_hidden = torch.zeros(
(episode_num, self.n_agents, self.args.rnn_hidden_dim))
# self.target_policy_hidden = torch.zeros((episode_num, self.n_agents, self.args.rnn_hidden_dim)) # TODO
if self.args.cuda:
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
self.eval_hidden_2 = self.eval_hidden.cuda()
self.target_hidden_2 = self.target_hidden.cuda()
self.policy_hidden = self.policy_hidden.cuda()
# self.target_policy_hidden = self.target_policy_hidden.cuda()
def save_model(self, train_step):
num = str(train_step // self.args.save_cycle)
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
torch.save(self.eval_qmix_net.state_dict(),
self.model_dir + '/' + num + '_qmix_net_params.pkl')
torch.save(self.eval_rnn.state_dict(),
self.model_dir + '/' + num + '_rnn_net_params.pkl')
torch.save(self.agent.policy.state_dict(),
self.model_dir + '/' + num + '_policy_net_params.pkl')
def soft_update(self):
self.tau = 0.005
for param, target_param in zip(self.eval_rnn.parameters(),
self.target_rnn.parameters()):
target_param.data.copy_(self.tau * param.data +
(1 - self.tau) * target_param.data)
for param, target_param in zip(self.eval_qmix_net.parameters(),
self.target_qmix_net.parameters()):
target_param.data.copy_(self.tau * param.data +
(1 - self.tau) * target_param.data)
for param, target_param in zip(self.eval_rnn_2.parameters(),
self.target_rnn_2.parameters()):
target_param.data.copy_(self.tau * param.data +
(1 - self.tau) * target_param.data)
for param, target_param in zip(self.eval_qmix_net_2.parameters(),
self.target_qmix_net_2.parameters()):
target_param.data.copy_(self.tau * param.data +
(1 - self.tau) * target_param.data)
class Q_Decom:
def __init__(self, args, itr):
self.args = args
input_shape = self.args.obs_shape
# 调整RNN输入维度
if args.last_action:
input_shape += self.args.n_actions
if args.reuse_network:
input_shape += self.args.n_agents
# 设置网络
self.eval_rnn = RNN(input_shape, args)
self.target_rnn = RNN(input_shape, args)
# 通过数字标记，方便后续对算法类型进行判断
self.wqmix = 0
if self.args.alg == 'cwqmix' or self.args.alg == 'owqmix':
self.wqmix = 1
# 默认值分解算法使用QMIX
if 'qmix' in self.args.alg:
self.eval_mix_net = QMIXMixer(args)
self.target_mix_net = QMIXMixer(args)
if self.wqmix > 0:
self.qstar_eval_mix = QStar(args)
self.qstar_target_mix = QStar(args)
self.qstar_eval_rnn = RNN(input_shape, args)
self.qstar_target_rnn = RNN(input_shape, args)
if self.args.alg == 'cwqmix':
self.alpha = 0.75
elif self.args.alg == 'owqmix':
self.alpha = 0.5
else:
raise Exception('没有这个算法')
elif self.args.alg == 'vdn':
self.eval_mix_net = VDNMixer()
self.target_mix_net = VDNMixer()
# 是否使用GPU
if args.cuda:
self.eval_rnn.cuda()
self.target_rnn.cuda()
self.eval_mix_net.cuda()
self.target_mix_net.cuda()
if self.wqmix > 0:
self.qstar_eval_mix.cuda()
self.qstar_target_mix.cuda()
self.qstar_eval_rnn.cuda()
self.qstar_target_rnn.cuda()
# 是否加载模型
self.model_dir = args.model_dir + '/' + args.alg + '/' + args.map + '/' + str(
itr)
if args.load_model:
if os.path.exists(self.model_dir + '/rnn_net_params.pkl'):
path_rnn = self.model_dir + '/rnn_net_params.pkl'
path_mix = self.model_dir + '/' + self.args.alg + '_net_params.pkl'
map_location = 'cuda:0' if args.cuda else 'cpu'
self.eval_rnn.load_state_dict(
torch.load(path_rnn, map_location=map_location))
self.eval_mix_net.load_state_dict(
torch.load(path_mix, map_location=map_location))
if self.wqmix > 0:
path_agent_rnn = self.model_dir + '/rnn_net_params2.pkl'
path_qstar = self.model_dir + '/' + 'qstar_net_params.pkl'
self.qstar_eval_rnn.load_state_dict(
torch.load(path_agent_rnn, map_location=map_location))
self.qstar_eval_mix.load_state_dict(
torch.load(path_qstar, map_location=map_location))
print('成功加载模型 %s' % path_rnn + ' 和 %s' % path_mix)
else:
raise Exception("模型不存在")
# 令target网络与eval网络参数相同
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_mix_net.load_state_dict(self.eval_mix_net.state_dict())
# 获取所有参数
self.eval_params = list(self.eval_rnn.parameters()) + list(
self.eval_mix_net.parameters())
# 学习过程中要为每个episode的每个agent维护一个eval_hidden，执行过程中要为每个agetn维护一个eval_hidden
self.eval_hidden = None
self.target_hidden = None
if self.wqmix > 0:
# 令target网络与eval网络参数相同
self.qstar_target_rnn.load_state_dict(
self.qstar_eval_rnn.state_dict())
self.qstar_target_mix.load_state_dict(
self.qstar_eval_mix.state_dict())
# 获取所有参数
self.qstar_params = list(self.qstar_eval_rnn.parameters()) + list(
self.qstar_eval_mix.parameters())
# init hidden
self.qstar_eval_hidden = None
self.qstar_target_hidden = None
# 获取优化器
if args.optim == 'RMS':
self.optimizer = torch.optim.RMSprop(self.eval_params, lr=args.lr)
if self.wqmix > 0:
self.qstar_optimizer = torch.optim.RMSprop(self.qstar_params,
lr=args.lr)
else:
self.optimizer = torch.optim.Adam(self.eval_params)
if self.wqmix > 0:
self.qstar_optimizer = torch.optim.Adam(self.qstar_params)
print("值分解算法 " + self.args.alg + " 初始化")
def learn(self, batch, max_episode_len, train_step, epsilon=None):
"""
在learn的时候，抽取到的数据是四维的，四个维度分别为
1——第几个episode
2——episode中第几个transition
3——第几个agent的数据
4——具体obs维度。
因为在选动作时不仅需要输入当前的inputs，还要给神经网络输入hidden_state，
hidden_state和之前的经验相关，因此就不能随机抽取经验进行学习。所以这里一次抽取多个episode，
然后一次给神经网络传入每个episode的同一个位置的transition
:param batch:
:param max_episode_len:
:param train_step:
:param epsilon:
:return:
"""
# 获得episode的数目
episode_num = batch['o'].shape[0]
# 初始化隐藏状态
self.init_hidden(episode_num)
# 数据转为tensor
for key in batch.keys():
if key == 'a':
batch[key] = torch.LongTensor(batch[key])
else:
batch[key] = torch.Tensor(batch[key])
s, next_s, a, r, avail_a, next_avail_a, done = batch['s'], batch['next_s'], batch['a'], \
batch['r'], batch['avail_a'], batch['next_avail_a'], \
batch['done']
# 避免填充的产生 TD-error 影响训练
mask = 1 - batch["padded"].float()
# 获取当前与下个状态的q值，（episode, max_episode_len, n_agents, n_actions）
eval_qs, target_qs = self.get_q(batch, episode_num, max_episode_len)
# 是否使用GPU
if self.args.cuda:
a = a.cuda()
r = r.cuda()
done = done.cuda()
mask = mask.cuda()
if 'qmix' in self.args.alg:
s = s.cuda()
next_s = next_s.cuda()
# 得到每个动作对应的 q 值
eval_qs = torch.gather(eval_qs, dim=3, index=a).squeeze(3)
# 计算Q_tot
eval_q_total = self.eval_mix_net(eval_qs, s)
qstar_q_total = None
# 需要先把不行动作的mask掉
target_qs[next_avail_a == 0.0] = -9999999
if self.wqmix > 0:
# TODO 找到使得Q_tot最大的联合动作，由于qmix是单调假设的，每个agent q值最大则 Q_tot最大，因此联合动作就是每个agent q值最大的动作
argmax_u = target_qs.argmax(dim=3).unsqueeze(3)
qstar_eval_qs, qstar_target_qs = self.get_q(
batch, episode_num, max_episode_len, True)
# 获得对应的动作q值
qstar_eval_qs = torch.gather(qstar_eval_qs, dim=3,
index=a).squeeze(3)
qstar_target_qs = torch.gather(qstar_target_qs,
dim=3,
index=argmax_u).squeeze(3)
# 通过前馈网络得到qstar
qstar_q_total = self.qstar_eval_mix(qstar_eval_qs, s)
next_q_total = self.qstar_target_mix(qstar_target_qs, next_s)
else:
# 得到 target q，是inf出现的nan
# target_qs[next_avail_a == 0.0] = float('-inf')
target_qs = target_qs.max(dim=3)[0]
# 计算target Q_tot
next_q_total = self.target_mix_net(target_qs, next_s)
target_q_total = r + self.args.gamma * next_q_total * (1 - done)
weights = torch.Tensor(np.ones(eval_q_total.shape))
if self.wqmix > 0:
# 1- 可以保证weights在 (0, 1]
# TODO: 这里只说是 (0, 1] 之间，也没说怎么设置还是学习，暂时认为是一个随机数
# weights = torch.Tensor(1 - np.random.ranf(eval_q_total.shape))
weights = torch.full(eval_q_total.shape, self.alpha)
if self.args.alg == 'cwqmix':
error = mask * (target_q_total - qstar_q_total)
elif self.args.alg == 'owqmix':
error = mask * (target_q_total - eval_q_total)
else:
raise Exception("模型不存在")
weights[error > 0] = 1.
# qstar 参数更新
qstar_error = mask * (qstar_q_total - target_q_total.detach())
qstar_loss = (qstar_error**2).sum() / mask.sum()
self.qstar_optimizer.zero_grad()
qstar_loss.backward()
torch.nn.utils.clip_grad_norm_(self.qstar_params,
self.args.clip_norm)
self.qstar_optimizer.step()
# 计算 TD error
# TODO 这里权值detach有影响吗
td_error = mask * (eval_q_total - target_q_total.detach())
if self.args.cuda:
weights = weights.cuda()
loss = (weights.detach() * td_error**2).sum() / mask.sum()
self.optimizer.zero_grad()
loss.backward()
torch.nn.utils.clip_grad_norm_(self.eval_params, self.args.clip_norm)
self.optimizer.step()
if train_step > 0 and train_step % self.args.target_update_period == 0:
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_mix_net.load_state_dict(self.eval_mix_net.state_dict())
if self.wqmix > 0:
self.qstar_target_rnn.load_state_dict(
self.qstar_eval_rnn.state_dict())
self.qstar_target_mix.load_state_dict(
self.qstar_eval_mix.state_dict())
def init_hidden(self, episode_num):
"""
为每个episode中的每个agent都初始化一个eval_hidden，target_hidden
:param episode_num:
:return:
"""
self.eval_hidden = torch.zeros(
(episode_num, self.args.n_agents, self.args.rnn_hidden_dim))
self.target_hidden = torch.zeros(
(episode_num, self.args.n_agents, self.args.rnn_hidden_dim))
if self.wqmix > 0:
self.qstar_eval_hidden = torch.zeros(
(episode_num, self.args.n_agents, self.args.rnn_hidden_dim))
self.qstar_target_hidden = torch.zeros(
(episode_num, self.args.n_agents, self.args.rnn_hidden_dim))
def get_q(self, batch, episode_num, max_episode_len, wqmix=False):
eval_qs, target_qs = [], []
for trans_idx in range(max_episode_len):
# 每个obs加上agent编号和last_action
inputs, next_inputs = self.get_inputs(batch, episode_num,
trans_idx)
# 是否使用GPU
if self.args.cuda:
inputs = inputs.cuda()
next_inputs = next_inputs.cuda()
if wqmix:
self.qstar_eval_hidden = self.qstar_eval_hidden.cuda()
self.qstar_target_hidden = self.qstar_target_hidden.cuda()
else:
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
# 得到q值
if wqmix:
eval_q, self.qstar_eval_hidden = self.qstar_eval_rnn(
inputs, self.qstar_eval_hidden)
target_q, self.qstar_target_hidden = self.qstar_target_rnn(
next_inputs, self.qstar_target_hidden)
else:
eval_q, self.eval_hidden = self.eval_rnn(
inputs, self.eval_hidden)
target_q, self.target_hidden = self.target_rnn(
next_inputs, self.target_hidden)
# 形状变换
eval_q = eval_q.view(episode_num, self.args.n_agents, -1)
target_q = target_q.view(episode_num, self.args.n_agents, -1)
# 添加这个transition 的信息
eval_qs.append(eval_q)
target_qs.append(target_q)
# 将max_episode_len个(episode, n_agents, n_actions) 堆叠为 (episode, max_episode_len, n_agents, n_actions)
eval_qs = torch.stack(eval_qs, dim=1)
target_qs = torch.stack(target_qs, dim=1)
return eval_qs, target_qs
def get_inputs(self, batch, episode_num, trans_idx):
# 取出所有episode上该trans_idx的经验，onehot_a要取出所有，因为要用到上一条
obs, next_obs, onehot_a = batch['o'][:, trans_idx], \
batch['next_o'][:, trans_idx], batch['onehot_a'][:]
inputs, next_inputs = [], []
inputs.append(obs)
next_inputs.append(next_obs)
# 给obs添加上一个动作，agent编号
if self.args.last_action:
if trans_idx == 0:
inputs.append(torch.zeros_like(onehot_a[:, trans_idx]))
else:
inputs.append(onehot_a[:, trans_idx - 1])
next_inputs.append(onehot_a[:, trans_idx])
if self.args.reuse_network:
"""
给数据增加agent编号，对于每个episode的数据，分为多个agent，每个agent编号为独热编码，
这样对于所有agent的编号堆叠起来就是一个单位矩阵
"""
inputs.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
next_inputs.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
# 将之前append的数据合并，得到形状为(episode_num*n_agents, obs*(n_actions*n_agents))
inputs = torch.cat(
[x.reshape(episode_num * self.args.n_agents, -1) for x in inputs],
dim=1)
next_inputs = torch.cat([
x.reshape(episode_num * self.args.n_agents, -1)
for x in next_inputs
],
dim=1)
return inputs, next_inputs
def save_model(self, train_step):
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
if type(train_step) == str:
num = train_step
else:
num = str(train_step // self.args.save_model_period)
torch.save(
self.eval_mix_net.state_dict(), self.model_dir + '/' + num + '_' +
self.args.alg + '_net_params.pkl')
torch.save(self.eval_rnn.state_dict(),
self.model_dir + '/' + num + '_rnn_params.pkl')
class DMAQ_qattenLearner:
def __init__(self, args, itr):
self.args = args
input_shape = self.args.obs_shape
# 调整RNN输入维度
if args.last_action:
input_shape += self.args.n_actions
if args.reuse_network:
input_shape += self.args.n_agents
# 设置网络
self.eval_rnn = RNN(input_shape, args)
self.target_rnn = RNN(input_shape, args)
# 默认值分解算法使用 dmaq
if self.args.alg == 'dmaq_qatten':
self.mixer = DMAQ_QattenMixer()
self.target_mixer = DMAQ_QattenMixer()
elif self.args.alg == 'dmaq':
self.mixer = DMAQer(args)
self.target_mixer = DMAQer(args)
else:
raise Exception('Unsupported!')
# 是否使用GPU
if args.cuda:
self.eval_rnn.cuda()
self.target_rnn.cuda()
self.mixer.cuda()
self.target_mixer.cuda()
# 是否加载模型
# self.model_dir = args.model_dir + '/' + args.alg + '/' + args.map + '/' + str(itr)
# self.model_dir = args.model_dir + '/' + args.map + '/' + args.alg + '_' + str(self.args.epsilon_anneal_steps // 10000) + 'w' + '/' + str(itr)
if args.load_model:
if os.path.exists(self.args.model_dir + '/rnn_net_params.pkl'):
path_rnn = self.args.model_dir + '/rnn_net_params.pkl'
path_mix = self.args.model_dir + '/' + self.args.alg + '_net_params.pkl'
map_location = 'cuda:0' if args.cuda else 'cpu'
self.eval_rnn.load_state_dict(
torch.load(path_rnn, map_location=map_location))
self.mixer.load_state_dict(
torch.load(path_mix, map_location=map_location))
print('成功加载模型 %s' % path_rnn + ' 和 %s' % path_mix)
else:
raise Exception("模型不存在")
# 令target网络与eval网络参数相同
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_mixer.load_state_dict(self.mixer.state_dict())
# 获取所有参数
self.eval_params = list(self.eval_rnn.parameters()) + list(
self.mixer.parameters())
# 学习过程中要为每个episode的每个agent维护一个eval_hidden，执行过程中要为每个agetn维护一个eval_hidden
self.eval_hidden = None
self.target_hidden = None
# 获取优化器
if args.optim == 'RMS':
self.optimizer = torch.optim.RMSprop(self.eval_params, lr=args.lr)
else:
self.optimizer = torch.optim.Adam(self.eval_params)
print("值分解算法 " + self.args.alg + " 初始化")
def learn(self, batch, max_episode_len, train_step):
"""
在learn的时候，抽取到的数据是四维的，四个维度分别为
1——第几个episode
2——episode中第几个transition
3——第几个agent的数据
4——具体obs维度。
因为在选动作时不仅需要输入当前的inputs，还要给神经网络输入hidden_state，
hidden_state和之前的经验相关，因此就不能随机抽取经验进行学习。所以这里一次抽取多个episode，
然后一次给神经网络传入每个episode的同一个位置的transition
:param batch:
:param max_episode_len:
:param train_step:
:param epsilon:
:return:
"""
# 获得episode的数目
episode_num = batch['o'].shape[0]
# 初始化隐藏状态
self.init_hidden(episode_num)
# 数据转为tensor
for key in batch.keys():
if key == 'a':
batch[key] = torch.LongTensor(batch[key])
else:
batch[key] = torch.Tensor(batch[key])
s, next_s, a, r, avail_a, next_avail_a, done, actions_onehot = batch['s'], batch['next_s'], batch['a'], \
batch['r'], batch['avail_a'], batch[
'next_avail_a'], \
batch['done'], batch['onehot_a']
# 避免填充的产生 TD-error 影响训练
mask = 1 - batch["padded"].float()
# 获取当前与下个状态的q值，（episode, max_episode_len, n_agents, n_actions）
eval_qs, target_qs = self.get_q(batch, episode_num, max_episode_len)
# 是否使用GPU
if self.args.cuda:
a = a.cuda()
r = r.cuda()
done = done.cuda()
mask = mask.cuda()
s = s.cuda()
next_s = next_s.cuda()
actions_onehot = actions_onehot.cuda()
# 得到每个动作对应的 q 值
eval_qsa = torch.gather(eval_qs, dim=3, index=a).squeeze(3)
max_action_qvals = eval_qs.max(dim=3)[0]
target_qs[next_avail_a == 0.0] = -9999999
target_qsa = target_qs.max(dim=3)[0]
# target_max_actions = target_qs.argmax(dim=3).unsqueeze(3)
# 计算Q_tot
q_attend_regs = None
if self.args.alg == "dmaq_qatten":
ans_chosen, q_attend_regs, head_entropies = self.mixer(eval_qsa,
s,
is_v=True)
ans_adv, _, _ = self.mixer(eval_qsa,
s,
actions=actions_onehot,
max_q_i=max_action_qvals,
is_v=False)
eval_qsa = ans_chosen + ans_adv
else:
ans_chosen = self.mixer(eval_qsa, s, is_v=True)
ans_adv = self.mixer(eval_qsa,
s,
actions=actions_onehot,
max_q_i=max_action_qvals,
is_v=False)
eval_qsa = ans_chosen + ans_adv
# if self.args.double_q:
# if self.args.self.mixer == "dmaq_qatten":
# target_chosen, _, _ = self.target_mixer(target_chosen_qvals, batch["state"][:, 1:], is_v=True)
# target_adv, _, _ = self.target_mixer(target_chosen_qvals, batch["state"][:, 1:],
# actions=cur_max_actions_onehot,
# max_q_i=target_max_qvals, is_v=False)
# target_max_qvals = target_chosen + target_adv
# else:
# target_chosen = self.target_mixer(target_chosen_qvals, batch["state"][:, 1:], is_v=True)
# target_adv = self.target_mixer(target_chosen_qvals, batch["state"][:, 1:],
# actions=cur_max_actions_onehot,
# max_q_i=target_max_qvals, is_v=False)
# target_max_qvals = target_chosen + target_adv
# else:
target_max_qvals = self.target_mixer(target_qsa, next_s, is_v=True)
# Calculate 1-step Q-Learning targets
targets = r + self.args.gamma * (1 - done) * target_max_qvals
# Td-error
td_error = (eval_qsa - targets.detach())
mask = mask.expand_as(td_error)
# 0-out the targets that came from padded data
masked_td_error = td_error * mask
# Normal L2 loss, take mean over actual data
loss = (masked_td_error**2).sum() / mask.sum()
if self.args.alg == "dmaq_qatten":
loss += q_attend_regs
# else:
# loss = (masked_td_error ** 2).sum() / mask.sum()
self.optimizer.zero_grad()
loss.backward()
torch.nn.utils.clip_grad_norm_(self.eval_params, self.args.clip_norm)
self.optimizer.step()
if train_step > 0 and train_step % self.args.target_update_period == 0:
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_mixer.load_state_dict(self.mixer.state_dict())
def init_hidden(self, episode_num):
"""
为每个episode中的每个agent都初始化一个eval_hidden，target_hidden
:param episode_num:
:return:
"""
self.eval_hidden = torch.zeros(
(episode_num, self.args.n_agents, self.args.rnn_hidden_dim))
self.target_hidden = torch.zeros(
(episode_num, self.args.n_agents, self.args.rnn_hidden_dim))
def get_q(
self,
batch,
episode_num,
max_episode_len,
):
eval_qs, target_qs = [], []
for trans_idx in range(max_episode_len):
# 每个obs加上agent编号和last_action
inputs, next_inputs = self.get_inputs(batch, episode_num,
trans_idx)
# 是否使用GPU
if self.args.cuda:
inputs = inputs.cuda()
next_inputs = next_inputs.cuda()
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
# 得到q值
eval_q, self.eval_hidden = self.eval_rnn(inputs, self.eval_hidden)
target_q, self.target_hidden = self.target_rnn(
next_inputs, self.target_hidden)
# 形状变换
eval_q = eval_q.view(episode_num, self.args.n_agents, -1)
target_q = target_q.view(episode_num, self.args.n_agents, -1)
# 添加这个transition 的信息
eval_qs.append(eval_q)
target_qs.append(target_q)
# 将max_episode_len个(episode, n_agents, n_actions) 堆叠为 (episode, max_episode_len, n_agents, n_actions)
eval_qs = torch.stack(eval_qs, dim=1)
target_qs = torch.stack(target_qs, dim=1)
return eval_qs, target_qs
def get_inputs(self, batch, episode_num, trans_idx):
# 取出所有episode上该trans_idx的经验，onehot_a要取出所有，因为要用到上一条
obs, next_obs, onehot_a = batch['o'][:, trans_idx], \
batch['next_o'][:, trans_idx], batch['onehot_a'][:]
inputs, next_inputs = [], []
inputs.append(obs)
next_inputs.append(next_obs)
# 给obs添加上一个动作，agent编号
if self.args.last_action:
if trans_idx == 0:
inputs.append(torch.zeros_like(onehot_a[:, trans_idx]))
else:
inputs.append(onehot_a[:, trans_idx - 1])
next_inputs.append(onehot_a[:, trans_idx])
if self.args.reuse_network:
"""
给数据增加agent编号，对于每个episode的数据，分为多个agent，每个agent编号为独热编码，
这样对于所有agent的编号堆叠起来就是一个单位矩阵
"""
inputs.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
next_inputs.append(
torch.eye(self.args.n_agents).unsqueeze(0).expand(
episode_num, -1, -1))
# 将之前append的数据合并，得到形状为(episode_num*n_agents, obs*(n_actions*n_agents))
inputs = torch.cat(
[x.reshape(episode_num * self.args.n_agents, -1) for x in inputs],
dim=1)
next_inputs = torch.cat([
x.reshape(episode_num * self.args.n_agents, -1)
for x in next_inputs
],
dim=1)
return inputs, next_inputs
def save_model(self, train_step):
if not os.path.exists(self.args.model_dir):
os.makedirs(self.args.model_dir)
if type(train_step) == str:
num = train_step
else:
num = str(train_step // self.args.save_model_period)
torch.save(
self.mixer.state_dict(), self.args.model_dir + '/' + num + '_' +
self.args.alg + '_net_params.pkl')
torch.save(self.eval_rnn.state_dict(),
self.args.model_dir + '/' + num + '_rnn_params.pkl')
class QMIX_PG():
def __init__(self, agent, args):
self.agent = agent
self.target_policy = copy.deepcopy(self.agent.policy) # TODO
self.policy_params = list(agent.policy.parameters())
self.policy_optimiser = torch.optim.RMSprop(params=self.policy_params,
lr=args.actor_lr) # , alpha=args.optim_alpha, eps=args.optim_eps)
self.n_actions = args.n_actions
self.n_agents = args.n_agents
self.state_shape = args.state_shape
self.obs_shape = args.obs_shape
input_shape = self.obs_shape
# 根据参数决定RNN的输入维度
if args.last_action:
input_shape += self.n_actions
if args.reuse_network:
input_shape += self.n_agents
# 神经网络
self.eval_rnn = RNN(input_shape, args) # 每个agent选动作的网络
self.target_rnn = RNN(input_shape, args)
self.eval_qmix_net = QMixNet(args) # 把agentsQ值加起来的网络
self.target_qmix_net = QMixNet(args)
self.args = args
if self.args.cuda:
self.eval_rnn.cuda()
self.target_rnn.cuda()
self.eval_qmix_net.cuda()
self.target_qmix_net.cuda()
self.agent.policy.cuda()
self.target_policy.cuda()
tmp = f'clamp2-5_' + f'{args.loss_coeff_entropy}_' + f'{args.actor_buffer_size}_{args.critic_buffer_size}_{args.actor_train_steps}_{args.critic_train_steps}_' \
f'{args.actor_update_delay}_{args.critic_lr}' # f'{args.anneal_epsilon}_'
self.model_dir = 'linear_mix/' + args.model_dir + '/qmix_ac_total_counterfactual' + '/' + tmp + '/' + args.map
# 如果存在模型则加载模型
if self.args.load_model:
if os.path.exists(self.model_dir + '/rnn_net_params.pkl'):
path_rnn = self.model_dir + '/rnn_net_params.pkl'
path_qmix = self.model_dir + '/qmix_net_params.pkl'
path_policy = self.model_dir + '/policy_net_params.pkl'
map_location = 'cuda:0' if self.args.cuda else 'cpu'
self.eval_rnn.load_state_dict(torch.load(path_rnn, map_location=map_location))
self.eval_qmix_net.load_state_dict(torch.load(path_qmix, map_location=map_location))
self.target_policy.load_state_dict(torch.load(path_policy, map_location=map_location)) # TODO
print('Successfully load the model: {} and {}'.format(path_rnn, path_qmix))
else:
raise Exception("No model!")
# 让target_net和eval_net的网络参数相同
self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
self.target_qmix_net.load_state_dict(self.eval_qmix_net.state_dict())
self.target_policy.load_state_dict(self.agent.policy.state_dict()) # TODO
self.eval_parameters = list(self.eval_qmix_net.parameters()) + list(self.eval_rnn.parameters())
if args.optimizer == "RMS":
self.optimizer = torch.optim.RMSprop(self.eval_parameters, lr=args.critic_lr)
# 执行过程中，要为每个agent都维护一个eval_hidden
# 学习过程中，要为每个episode的每个agent都维护一个eval_hidden、target_hidden
self.eval_hidden = None
self.target_hidden = None
print('Init alg QMIX')
def train_actor(self, batch, max_episode_len, update_agent_id=0): # EpisodeBatch
# Get the relevant quantities
# bs = batch.batch_size
# max_t = batch.max_seq_length
# actions = batch["u"][:, :-1]
# terminated = batch["terminated"][:, :-1].float()
# avail_actions = batch["avail_u"][:, :-1]
# # mask = batch["filled"][:, :-1].float()
# mask = 1 - batch["padded"].float()
# mask[:, 1:] = mask[:, 1:] * (1 - terminated[:, :-1])
# mask = mask.repeat(1, 1, self.n_agents).view(-1)
# states = batch["s"][:, :-1]
episode_num = batch['o'].shape[0]
self.init_hidden(episode_num)
for key in batch.keys(): # 把batch里的数据转化成tensor
if key == 'u':
batch[key] = torch.tensor(batch[key], dtype=torch.long)
else:
batch[key] = torch.tensor(batch[key], dtype=torch.float32)
# s, s_next, u, r, avail_u, avail_u_next, terminated = batch['s'], batch['s_next'], batch['u'], \
# batch['r'], batch['avail_u'], batch['avail_u_next'], \
# batch['terminated']
s = batch['s']
terminated = batch['terminated']
mask = 1 - batch["padded"].float() # 用来把那些填充的经验的TD-error置0，从而不让它们影响到学习
mask[:, 1:] = mask[:, 1:] * (1 - terminated[:, :-1])
mask = mask.repeat(1, 1, self.n_agents).view(-1)
# actions = batch["u"][:, :-1]
actions = batch["u"]
avail_u = batch["avail_u"]
# terminated = batch["terminated"][:, :-1].float()
# avail_actions = batch["avail_u"][:, :-1]
if self.args.cuda:
s = s.cuda()
# u = u.cuda()
# r = r.cuda()
# s_next = s_next.cuda()
# terminated = terminated.cuda()
actions = actions.cuda()
avail_u = avail_u.cuda()
mask = mask.cuda()
# # build q
# inputs = self.critic._build_inputs(batch, bs, max_t)
# q_vals = self.critic.forward(inputs).detach()[:, :-1]
# episode_num = batch['o'].shape[0]
q_evals, q_targets = [], []
actions_prob = []
# self.agent.init_hidden(batch.batch_size)
# self.policy_hidden= self.policy.init_hidden().unsqueeze(0).expand(batch_size, self.n_agents, -1) # bav
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
self.eval_hidden = self.eval_hidden.cuda()
q_eval, self.eval_hidden = self.eval_rnn(inputs,
self.eval_hidden) # inputs维度为(40,96)，得到的q_eval维度为(40,n_actions) Q_i
# 把q_eval维度重新变回(8, 5,n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
agent_outs, self.policy_hidden = self.agent.policy(inputs, self.policy_hidden)
avail_actions_ = avail_u[:, transition_idx]
reshaped_avail_actions = avail_actions_.reshape(episode_num * self.n_agents, -1)
agent_outs[reshaped_avail_actions == 0] = -1e11
# agent_outs = torch.nn.functional.softmax(agent_outs, dim=-1)
# agent_outs = gumbel_softmax(agent_outs, hard=False) #todo
agent_outs = F.softmax(agent_outs / 1, dim=1) # 概率分布
# If hard=True, then the returned sample will be one-hot, otherwise it will
# be a probabilitiy distribution that sums to 1 across classes
agent_outs = agent_outs.view(episode_num, self.n_agents, -1)
actions_prob.append(agent_outs) # 每个动作的概率
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_vals = torch.stack(q_evals, dim=1)
# mac_out = []
# self.mac.init_hidden(batch.batch_size)
# for t in range(batch.max_seq_length - 1):
# agent_outs = self.mac.forward(batch, t=t)
# mac_out.append(agent_outs)
actions_prob = torch.stack(actions_prob, dim=1) # Concat over time
# Mask out unavailable actions, renormalise (as in action selection)
# actions_prob[avail_actions == 0] = 0
# actions_prob = actions_prob / actions_prob.sum(dim=-1, keepdim=True)
# actions_prob[avail_actions == 0] = 0
# Calculated baseline
q_taken_actions = torch.gather(q_vals, dim=3, index=actions).squeeze(3) # (1,60,3) TODO NOTE
q_taken = self.eval_qmix_net(q_taken_actions, s).detach() # TODO # (1,60,1)
Q_taken = q_taken.repeat(repeats=(1, 1, self.n_agents)) # (1,60,3)
pi = actions_prob.view(-1, self.n_actions)
# q_targets_mean = torch.sum(actions_prob * q_vals, dim=-1).view(-1).detach() # (180)
q_mean_actions = torch.sum(actions_prob * q_vals, dim=-1).detach() # (1,60,3)
q_i_mean_negi_taken = []
# torch.stack( [torch.cat((q_targets_mean[:, :, i].unsqueeze(2), torch.cat((q_taken[:, :, :i], q_taken[:, :, i + 1:]), dim=2)),
# dim=2) for i in range(3)],dim=1) # 顺序不对
q_taken_actions_detached = q_taken_actions.detach()
for i in range(self.n_agents):
q_temp = copy.deepcopy(q_taken_actions_detached)
q_temp[:, :, i] = q_mean_actions[:, :, i] # q_i(mean_action) q_-i(tacken_action),
q_i_mean_negi_taken.append(q_temp)
q_i_mean_negi_taken = torch.stack(q_i_mean_negi_taken, dim=2) # [1, 60, 3, 3]
q_i_mean_negi_taken = q_i_mean_negi_taken.view(episode_num, -1, self.n_agents) # [1, 60*3, 3]
# TODO
# s_repeat = s.repeat(repeats=(1, self.n_agents, 1)) # (1,60,48)-> # (1,60*3,48) #TODO 顺序错误
s_repeat = s.repeat(repeats=(1, 1, self.n_agents)) # (1,60,48)-> # (1,60,48*3)
s_repeat = s_repeat.view(episode_num, self.n_agents, -1) # (1,60,48*3)-> # (1,60*3,48)
Q_i_mean_negi_taken = self.eval_qmix_net(q_i_mean_negi_taken, s_repeat).detach() # TODO # (1,60*3,1)
# q_total_target = q_total_target.repeat(repeats=(1, 1, self.n_agents)) # (1,60,3)
Q_i_mean_negi_taken = Q_i_mean_negi_taken.view(episode_num, -1, self.n_agents) # (1,60*3,1)->(1,60,3)
# Calculate policy grad with mask
pi_taken = torch.gather(pi, dim=1, index=actions.reshape(-1, 1)).squeeze(1)
pi_taken[mask == 0] = 1.0
log_pi_taken = torch.log(pi_taken)
# # TODO normalnize
# advantages_original=(q_taken.view(-1,self.n_agents)-baseline.view(-1,self.n_agents))
# advantages = (advantages_original - advantages_original.mean(dim=0)) / advantages_original.std(dim=0) #
# # advantages = (advantages_original-advantages_original.mean(dim=1).repeat(repeats=(1, max_episode_len, 1)))/advantages_original.std(dim=1).repeat(repeats=(1, max_episode_len, 1))
# advantages=advantages.view(-1).detach()
# TODO no normalnize
advantages = (Q_taken.view(-1) - Q_i_mean_negi_taken.view(-1)).detach()
# advantages = (Q_taken.view(-1) ).detach()#TODO
if self.args.advantage_norm: # TODO
EPS = 1e-10
advantages = (advantages - advantages.mean()) / (advantages.std() + EPS)
# advantages = (q_taken.view(-1) - baseline.view(-1)).detach()
# advantages = (-log_pi_taken + q_taken.view(-1).detach() - baseline) # TODO
# import numpy as np
# update_agent_id = np.random.randint(0, self.n_agents) # TODO
# update_agent_id=update_agent_id+1 if update_agent_id<self.n_agents-1 else 0
# policy_loss = - ((advantages[update_agent_id::self.n_agents] * log_pi_taken[update_agent_id::self.n_agents]) * mask[update_agent_id::self.n_agents]).sum() / mask[update_agent_id::self.n_agents].sum()
policy_loss = - ((advantages * log_pi_taken) * mask).sum() / mask.sum()
# policy_entropy = torch.mean(torch.exp(log_pi_taken) * log_pi_taken)
# regu_policy_loss = policy_loss + self.args.loss_coeff_entropy * policy_entropy
# Optimise agents
self.policy_optimiser.zero_grad()
policy_loss.backward() # policy gradient
grad_norm = torch.nn.utils.clip_grad_norm_(self.policy_params, self.args.grad_norm_clip)
self.policy_optimiser.step()
self.soft_update()
if policy_loss.item() > 1e3:
print("policy_loss:", policy_loss.item())
def train_critic(self, batch, max_episode_len, train_step): # train_step表示是第几次学习，用来控制更新target_net网络的参数
'''
在learn的时候，抽取到的数据是四维的，四个维度分别为 1——第几个episode 2——episode中第几个transition
3——第几个agent的数据 4——具体obs维度。因为在选动作时不仅需要输入当前的inputs，还要给神经网络输入hidden_state，
hidden_state和之前的经验相关，因此就不能随机抽取经验进行学习。所以这里一次抽取多个episode，然后一次给神经网络
传入每个episode的同一个位置的transition
'''
episode_num = batch['o'].shape[0]
self.init_hidden(episode_num)
for key in batch.keys(): # 把batch里的数据转化成tensor
if key == 'u':
batch[key] = torch.tensor(batch[key], dtype=torch.long)
else:
batch[key] = torch.tensor(batch[key], dtype=torch.float32)
s, s_next, u, r, avail_u, avail_u_next, terminated = batch['s'], batch['s_next'], batch['u'], \
batch['r'], batch['avail_u'], batch['avail_u_next'], \
batch['terminated']
mask = 1 - batch["padded"].float() # 用来把那些填充的经验的TD-error置0，从而不让它们影响到学习
r = (r - r.mean()) / (r.std() + 1e-6) # todo
# 得到每个agent对应的Q值，维度为(episode个数, max_episode_len， n_agents， n_actions)
q_evals, q_targets = self.get_q_values(batch, max_episode_len)
if self.args.cuda:
s = s.cuda()
u = u.cuda()
r = r.cuda()
s_next = s_next.cuda()
terminated = terminated.cuda()
mask = mask.cuda()
# 取每个agent动作对应的Q值，并且把最后不需要的一维去掉，因为最后一维只有一个值了
q_evals = torch.gather(q_evals, dim=3, index=u).squeeze(3)
episode_num = batch['o'].shape[0]
q_targets_sample = []
actions_prob = []
actions_next_sample = []
# self.agent.init_hidden(batch.batch_size)
# self.policy_hidden= self.policy.init_hidden().unsqueeze(0).expand(batch_size, self.n_agents, -1) # bav
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
# agent_outs, self.target_policy_hidden = self.target_policy(inputs_next, self.target_policy_hidden) TODO
agent_outs, self.policy_hidden = self.agent.policy(inputs_next, self.policy_hidden)
avail_actions_ = avail_u[:, transition_idx]
reshaped_avail_actions = avail_actions_.reshape(episode_num * self.n_agents, -1)
agent_outs[reshaped_avail_actions == 0] = -1e11
# agent_outs = gumbel_softmax(agent_outs, hard=True) # one-hot TODO ac_sample1
# agent_outs = agent_outs.view(episode_num, self.n_agents, -1) # (1,3,9)
# action_next = agent_outs.max(dim=2, keepdim=True)[1] # (1,3,1)
# # action_next = torch.nonzero(agent_outs).squeeze()
# actions_next_sample.append(action_next) # 选择动作的序号
# agent_outs = gumbel_softmax(agent_outs, hard=True) # 概率 TODO ac_mean
agent_outs = F.softmax(agent_outs / 1, dim=1) # 概率分布
agent_outs = agent_outs.view(episode_num, self.n_agents, -1)
actions_prob.append(agent_outs) # 每个动作的概率
actions_prob = torch.stack(actions_prob, dim=1) # Concat over time
# pi = actions_prob.view(-1, self.n_actions)
# Calculated baseline
baseline = torch.sum(actions_prob * q_targets, dim=-1).view(episode_num, max_episode_len,
-1).detach() # (1,60,3)
q_targets_sample = baseline
# actions_next_sample = torch.stack(actions_next_sample, dim=1) # Concat over time # (1,60,3,1) TODO
# # q_targets_sample = q_targets[:,:,actions_next]
# q_targets_sample = torch.gather(q_targets, dim=3, index=actions_next_sample).squeeze(3) # (1,60,3)
# # 得到target_q
# q_targets[avail_u_next == 0.0] = - 9999999
# q_targets = q_targets.max(dim=3)[0]
q_total_eval = self.eval_qmix_net(q_evals, s) # [1, 60, 1]
q_total_target = self.target_qmix_net(q_targets_sample, s_next)
targets = r + self.args.gamma * q_total_target * (1 - terminated)
td_error = (q_total_eval - targets.detach())
masked_td_error = mask * td_error # 抹掉填充的经验的td_error
# 不能直接用mean，因为还有许多经验是没用的，所以要求和再比真实的经验数，才是真正的均值
critic_loss = (masked_td_error ** 2).sum() / mask.sum()
self.optimizer.zero_grad()
critic_loss.backward()
torch.nn.utils.clip_grad_norm_(self.eval_parameters, self.args.grad_norm_clip)
self.optimizer.step()
if critic_loss.item() > 1e3:
print("critic_loss:", critic_loss.item())
# if train_step > 0 and train_step % self.args.target_update_cycle == 0: # 200
# self.target_rnn.load_state_dict(self.eval_rnn.state_dict())
# self.target_qmix_net.load_state_dict(self.eval_qmix_net.state_dict())
# self.target_policy.load_state_dict(self.agent.policy.state_dict()) #TODO
# Update the frozen target models
if train_step % self.args.save_cycle == 0: # how often to save the model args.save_cycle = 5000
self.save_model(train_step) # TODO
def _get_inputs(self, batch, transition_idx):
# 取出所有episode上该transition_idx的经验，u_onehot要取出所有，因为要用到上一条
obs, obs_next, u_onehot = batch['o'][:, transition_idx], \
batch['o_next'][:, transition_idx], batch['u_onehot'][:]
episode_num = obs.shape[0]
inputs, inputs_next = [], []
inputs.append(obs)
inputs_next.append(obs_next)
# 给obs添加上一个动作、agent编号 30+9+3
if self.args.last_action:
if transition_idx == 0: # 如果是第一条经验，就让前一个动作为0向量
inputs.append(torch.zeros_like(u_onehot[:, transition_idx]))
else:
inputs.append(u_onehot[:, transition_idx - 1])
inputs_next.append(u_onehot[:, transition_idx])
if self.args.reuse_network:
# 因为当前的obs三维的数据，每一维分别代表(episode编号，agent编号，obs维度)，直接在dim_1上添加对应的向量
# 即可，比如给agent_0后面加(1, 0, 0, 0, 0)，表示5个agent中的0号。而agent_0的数据正好在第0行，那么需要加的
# agent编号恰好就是一个单位矩阵，即对角线为1，其余为0
inputs.append(torch.eye(self.args.n_agents).unsqueeze(0).expand(episode_num, -1, -1))
inputs_next.append(torch.eye(self.args.n_agents).unsqueeze(0).expand(episode_num, -1, -1))
# 要把obs中的三个拼起来，并且要把episode_num个episode、self.args.n_agents个agent的数据拼成40条(40,96)的数据，
# 因为这里所有agent共享一个神经网络，每条数据中带上了自己的编号，所以还是自己的数据
inputs = torch.cat([x.reshape(episode_num * self.args.n_agents, -1) for x in inputs], dim=1)
inputs_next = torch.cat([x.reshape(episode_num * self.args.n_agents, -1) for x in inputs_next], dim=1)
return inputs, inputs_next # (3,42)
def get_q_values(self, batch, max_episode_len):
episode_num = batch['o'].shape[0]
q_evals, q_targets = [], []
for transition_idx in range(max_episode_len):
inputs, inputs_next = self._get_inputs(batch, transition_idx) # 给obs加last_action、agent_id
if self.args.cuda:
inputs = inputs.cuda()
inputs_next = inputs_next.cuda()
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
q_eval, self.eval_hidden = self.eval_rnn(inputs,
self.eval_hidden) # inputs维度为(40,96)，得到的q_eval维度为(40,n_actions)
q_target, self.target_hidden = self.target_rnn(inputs_next, self.target_hidden)
# 把q_eval维度重新变回(8, 5,n_actions)
q_eval = q_eval.view(episode_num, self.n_agents, -1)
q_target = q_target.view(episode_num, self.n_agents, -1)
q_evals.append(q_eval)
q_targets.append(q_target)
# 得的q_eval和q_target是一个列表，列表里装着max_episode_len个数组，数组的的维度是(episode个数, n_agents，n_actions)
# 把该列表转化成(episode个数, max_episode_len， n_agents，n_actions)的数组
q_evals = torch.stack(q_evals, dim=1)
q_targets = torch.stack(q_targets, dim=1)
return q_evals, q_targets
def init_hidden(self, episode_num):
# 为每个episode中的每个agent都初始化一个eval_hidden、target_hidden
self.eval_hidden = torch.zeros((episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.target_hidden = torch.zeros((episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.policy_hidden = torch.zeros((episode_num, self.n_agents, self.args.rnn_hidden_dim))
self.target_policy_hidden = torch.zeros((episode_num, self.n_agents, self.args.rnn_hidden_dim)) # TODO
if self.args.cuda:
self.eval_hidden = self.eval_hidden.cuda()
self.target_hidden = self.target_hidden.cuda()
self.policy_hidden = self.policy_hidden.cuda()
self.target_policy_hidden = self.target_policy_hidden.cuda()
def save_model(self, train_step):
num = str(train_step // self.args.save_cycle)
if not os.path.exists(self.model_dir):
os.makedirs(self.model_dir)
torch.save(self.eval_qmix_net.state_dict(), self.model_dir + '/' + num + '_qmix_net_params.pkl')
torch.save(self.eval_rnn.state_dict(), self.model_dir + '/' + num + '_rnn_net_params.pkl')
torch.save(self.agent.policy.state_dict(), self.model_dir + '/' + num + '_policy_net_params.pkl')
def soft_update(self):
self.tau = 0.005
for param, target_param in zip(self.eval_rnn.parameters(), self.target_rnn.parameters()):
target_param.data.copy_(self.tau * param.data + (1 - self.tau) * target_param.data)
for param, target_param in zip(self.eval_qmix_net.parameters(), self.target_qmix_net.parameters()):
target_param.data.copy_(self.tau * param.data + (1 - self.tau) * target_param.data)
for param, target_param in zip(self.agent.policy.parameters(), self.target_policy.parameters()):
target_param.data.copy_(self.tau * param.data + (1 - self.tau) * target_param.data)
