def choose_command(word_ranks, word_masks_np, use_cuda, epsilon=0.0):
batch_size = word_ranks[0].size(0)
word_qvalues, word_indices_maxq = _choose_maxQ_command(
word_ranks, word_masks_np, use_cuda)
if epsilon > 0.0:
_, word_indices_random = _choose_random_command(
word_ranks, word_masks_np, use_cuda)
# random number for epsilon greedy
rand_num = np.random.uniform(low=0.0, high=1.0, size=(batch_size, 1))
less_than_epsilon = (rand_num < epsilon).astype("float32") # batch
greater_than_epsilon = 1.0 - less_than_epsilon
less_than_epsilon = to_pt(less_than_epsilon, use_cuda, type='float')
greater_than_epsilon = to_pt(greater_than_epsilon,
use_cuda,
type='float')
less_than_epsilon, greater_than_epsilon = less_than_epsilon.long(
), greater_than_epsilon.long()
chosen_indices = [
less_than_epsilon * idx_random + greater_than_epsilon * idx_maxq
for idx_random, idx_maxq in zip(word_indices_random,
word_indices_maxq)
]
else:
chosen_indices = word_indices_maxq
chosen_indices = [item.detach() for item in chosen_indices]
return word_qvalues, chosen_indices
def compute_reward(self):
"""
Compute rewards by agent. Note this is different from what the training/evaluation
scripts do. Agent keeps track of scores and other game information for training purpose.
"""
# mask = 1 if game is not finished or just finished at current step
if len(self.dones) == 1:
# it's not possible to finish a game at 0th step
mask = [1.0 for _ in self.dones[-1]]
else:
assert len(self.dones) > 1
mask = [1.0 if not self.dones[-2][i] else 0.0 for i in range(len(self.dones[-1]))]
mask = np.array(mask, dtype='float32')
mask_pt = to_pt(mask, self.use_cuda, type='float')
# rewards returned by game engine are always accumulated value the
# agent have recieved. so the reward it gets in the current game step
# is the new value minus values at previous step.
rewards = np.array(self.scores[-1], dtype='float32') # batch
if len(self.scores) > 1:
prev_rewards = np.array(self.scores[-2], dtype='float32')
rewards = rewards - prev_rewards
rewards_pt = to_pt(rewards, self.use_cuda, type='float')
return rewards, rewards_pt, mask, mask_pt
def get_agent_inputs(self, string_list):
sentence_token_list = [item.split() for item in string_list]
sentence_id_list = [
_words_to_ids(tokens, self.word2id)
for tokens in sentence_token_list
]
input_sentence_char = list_of_token_list_to_char_input(
sentence_token_list, self.char2id)
input_sentence = pad_sequences(
sentence_id_list, maxlen=max_len(sentence_id_list)).astype('int32')
input_sentence = to_pt(input_sentence, self.use_cuda)
input_sentence_char = to_pt(input_sentence_char, self.use_cuda)
return input_sentence, input_sentence_char, sentence_id_list
def update(self):
"""
Update neural model in agent. In this example we follow algorithm
of updating model in dqn with replay memory.
"""
if len(self.replay_memory) < self.replay_batch_size:
return None
transitions = self.replay_memory.sample(self.replay_batch_size)
batch = Transition(*zip(*transitions))
observation_id_list = pad_sequences(
batch.observation_id_list,
maxlen=max_len(batch.observation_id_list)).astype('int32')
input_observation = to_pt(observation_id_list, self.use_cuda)
next_observation_id_list = pad_sequences(
batch.next_observation_id_list,
maxlen=max_len(batch.next_observation_id_list)).astype('int32')
next_input_observation = to_pt(next_observation_id_list, self.use_cuda)
chosen_indices = list(list(zip(*batch.word_indices)))
chosen_indices = [torch.stack(item, 0)
for item in chosen_indices] # list of batch x 1
word_ranks = self.infer_word_ranks(
input_observation
) # list of batch x vocab, len=5 (one per potential output word)
word_qvalues = [
w_rank.gather(1, idx).squeeze(-1)
for w_rank, idx in zip(word_ranks, chosen_indices)
] # list of batch
q_value = torch.mean(torch.stack(word_qvalues, -1), -1) # batch
next_word_ranks = self.infer_word_ranks(
next_input_observation
) # batch x n_verb, batch x n_noun, batchx n_second_noun
next_word_masks = list(list(zip(*batch.next_word_masks)))
next_word_masks = [np.stack(item, 0) for item in next_word_masks]
next_word_qvalues, _ = _choose_maxQ_command(next_word_ranks,
next_word_masks,
self.use_cuda)
next_q_value = torch.mean(torch.stack(next_word_qvalues, -1),
-1) # batch
next_q_value = next_q_value.detach()
rewards = torch.stack(batch.reward) # batch
not_done = 1.0 - np.array(batch.done, dtype='float32') # batch
not_done = to_pt(not_done, self.use_cuda, type='float')
rewards = rewards + not_done * next_q_value * self.discount_gamma # batch
mask = torch.stack(batch.mask) # batch
loss = F.smooth_l1_loss(q_value * mask, rewards * mask)
return loss
def get_word_mask(self, list_of_query_id_list,
list_of_observation_id_list):
batch_size = len(list_of_query_id_list)
if self.generate_or_point == "generate":
sw_ids = set()
for sw in self.stopwords:
if sw in self.word2id:
sw_ids.add(self.word2id[sw])
word_mask = np.ones((batch_size, len(self.word_vocab)),
dtype="float32")
for _id in sw_ids:
word_mask[:, _id] = 0.0
word_mask = to_pt(word_mask,
enable_cuda=self.use_cuda,
type="float")
mask_word_id_list = []
all_word_ids = set(np.arange(len(self.word_vocab)).tolist())
m = list(all_word_ids - sw_ids)
for i in range(batch_size):
mask_word_id_list.append(m)
return word_mask, mask_word_id_list
word_mask_np = np.zeros((batch_size, len(self.word_vocab)),
dtype="float32")
mask_word_id_list = []
for i in range(batch_size):
mask_word_id_list.append(set())
for w_idx in list_of_query_id_list[i]:
if self.word_vocab[w_idx] in self.stopwords:
continue
word_mask_np[i][w_idx] = 1.0
mask_word_id_list[i].add(w_idx)
if self.generate_or_point == "qmpoint":
for w_idx in list_of_observation_id_list[i]:
if self.word_vocab[w_idx] in self.stopwords:
continue
word_mask_np[i][w_idx] = 1.0
mask_word_id_list[i].add(w_idx)
mask_word_id_list = [list(item) for item in mask_word_id_list]
for i in range(len(mask_word_id_list)):
if len(mask_word_id_list[i]) == 0:
mask_word_id_list[i].append(
self.word2id[","]) # just in case this list is empty
word_mask_np[i][self.word2id[","]] = 1.0
continue
word_mask = to_pt(word_mask_np,
enable_cuda=self.use_cuda,
type="float")
return word_mask, mask_word_id_list
def choose_random_command(self, word_ranks, word_masks_np):
"""
Generate a command randomly, for epsilon greedy.
Arguments:
word_ranks: Q values for each word by model.action_scorer.
word_masks_np: Vocabulary masks for words depending on their type (verb, adj, noun).
"""
batch_size = word_ranks[0].size(0)
word_ranks_np = [to_np(item) for item in word_ranks] # list of batch x n_vocab
word_ranks_np = [r * m for r, m in zip(word_ranks_np, word_masks_np)] # list of batch x n_vocab
word_indices = []
for i in range(len(word_ranks_np)):
indices = []
for j in range(batch_size):
msk = word_masks_np[i][j] # vocab
indices.append(np.random.choice(len(msk), p=msk / np.sum(msk, -1)))
word_indices.append(np.array(indices))
# word_indices: list of batch
word_qvalues = [[] for _ in word_masks_np]
for i in range(batch_size):
for j in range(len(word_qvalues)):
word_qvalues[j].append(word_ranks[j][i][word_indices[j][i]])
word_qvalues = [torch.stack(item) for item in word_qvalues]
word_indices = [to_pt(item, self.use_cuda) for item in word_indices]
word_indices = [item.unsqueeze(-1) for item in word_indices] # list of batch x 1
return word_qvalues, word_indices
def get_game_step_info(self, obs: List[str], infos: Dict[str, List[Any]]):
"""
Get all the available information, and concat them together to be tensor for
a neural model. we use post padding here, all information are tokenized here.
Arguments:
obs: Previous command's feedback for each game.
infos: Additional information for each game.
"""
inventory_token_list = [preproc(item, tokenizer=self.nlp) for item in infos["inventory"]]
inventory_id_list = [_words_to_ids(tokens, self.word2id) for tokens in inventory_token_list]
feedback_token_list = [preproc(item, str_type='feedback', tokenizer=self.nlp) for item in obs]
feedback_id_list = [_words_to_ids(tokens, self.word2id) for tokens in feedback_token_list]
quest_token_list = [preproc(item, tokenizer=self.nlp) for item in infos["extra.recipe"]]
quest_id_list = [_words_to_ids(tokens, self.word2id) for tokens in quest_token_list]
prev_action_token_list = [preproc(item, tokenizer=self.nlp) for item in self.prev_actions]
prev_action_id_list = [_words_to_ids(tokens, self.word2id) for tokens in prev_action_token_list]
description_token_list = [preproc(item, tokenizer=self.nlp) for item in infos["description"]]
for i, d in enumerate(description_token_list):
if len(d) == 0:
description_token_list[i] = ["end"] # if empty description, insert word "end"
description_id_list = [_words_to_ids(tokens, self.word2id) for tokens in description_token_list]
description_id_list = [_d + _i + _q + _f + _pa for (_d, _i, _q, _f, _pa) in zip(description_id_list, inventory_id_list, quest_id_list, feedback_id_list, prev_action_id_list)]
input_description = pad_sequences(description_id_list, maxlen=max_len(description_id_list)).astype('int32')
input_description = to_pt(input_description, self.use_cuda)
return input_description, description_id_list
def choose_maxQ_command(self, word_ranks, word_masks_np):
"""
Generate a command by maximum q values, for epsilon greedy.
Arguments:
word_ranks: Q values for each word by model.action_scorer.
word_masks_np: Vocabulary masks for words depending on their type (verb, adj, noun).
"""
batch_size = word_ranks[0].size(0)
word_ranks_np = [to_np(item)
for item in word_ranks] # list of batch x n_vocab
word_ranks_np = [
r - np.min(r) for r in word_ranks_np
] # minus the min value, so that all values are non-negative
word_ranks_np = [r * m for r, m in zip(word_ranks_np, word_masks_np)
] # list of batch x n_vocab
word_indices = [np.argmax(item, -1)
for item in word_ranks_np] # list of batch
word_qvalues = [[] for _ in word_masks_np]
for i in range(batch_size):
for j in range(len(word_qvalues)):
word_qvalues[j].append(word_ranks[j][i][word_indices[j][i]])
word_qvalues = [torch.stack(item) for item in word_qvalues]
word_indices = [to_pt(item, self.use_cuda) for item in word_indices]
word_indices = [item.unsqueeze(-1)
for item in word_indices] # list of batch x 1
return word_qvalues, word_indices
def get_qa_loss(self):
"""
Update neural model in agent. In this example we follow algorithm
of updating model in dqn with replay memory.
"""
if len(self.qa_replay_memory) < self.replay_batch_size:
return None
transitions = self.qa_replay_memory.sample(self.replay_batch_size)
batch = qa_Transition(*zip(*transitions))
answer_distribution, obs_mask = self.answer_question(
batch.observation_list, batch.quest_list,
use_model="online") # answer_distribution is batch x time x 2
answer_distribution = masked_softmax(answer_distribution,
obs_mask.unsqueeze(-1),
axis=1)
answer_strings = [item[0] for item in batch.answer_strings]
groundtruth_answer_positions = get_answer_position(
batch.observation_list, answer_strings) # list: batch x 2
groundtruth = pad_sequences(groundtruth_answer_positions).astype(
'int32')
groundtruth = to_pt(groundtruth, self.use_cuda) # batch x 2
batch_loss = NegativeLogLoss(
answer_distribution * obs_mask.unsqueeze(-1), groundtruth)
return torch.mean(batch_loss)
def act_random(self, obs, infos, input_observation, input_observation_char,
input_quest, input_quest_char, possible_words):
with torch.no_grad():
batch_size = len(obs)
word_indices_random = self.choose_random_command(
batch_size, len(self.word_vocab), possible_words)
chosen_indices = word_indices_random
chosen_strings = self.get_chosen_strings(chosen_indices)
for i in range(batch_size):
if chosen_strings[i] == "wait":
self.not_finished_yet[i] = 0.0
# info for replay memory
for i in range(batch_size):
if self.prev_actions[-1][i] == "wait":
self.prev_step_is_still_interacting[i] = 0.0
# previous step is still interacting, this is because DQN requires one step extra computation
replay_info = [
chosen_indices,
to_pt(self.prev_step_is_still_interacting, self.use_cuda,
"float")
]
# cache new info in current game step into caches
self.prev_actions.append(chosen_strings)
return chosen_strings, replay_info
def get_qa_loss(self):
"""
Update neural model in agent. In this example we follow algorithm
of updating model in dqn with replay memory.
"""
if len(self.qa_replay_memory) < self.replay_batch_size:
return None
transitions = self.qa_replay_memory.sample(self.replay_batch_size)
batch = qa_memory.qa_Transition(*zip(*transitions))
observation_list = batch.observation_list
quest_list = batch.quest_list
answer_strings = batch.answer_strings
answer_position = np.array(_words_to_ids(answer_strings, self.word2id))
groundtruth = to_pt(answer_position, self.use_cuda) # batch
input_quest, input_quest_char, _ = self.get_agent_inputs(quest_list)
input_observation, input_observation_char, observation_id_list = self.get_agent_inputs(
observation_list)
answer_distribution, _, _ = self.answer_question(
input_observation,
input_observation_char,
observation_id_list,
input_quest,
input_quest_char,
use_model="online") # batch x vocab
batch_loss = NegativeLogLoss(answer_distribution, groundtruth) # batch
return torch.mean(batch_loss)
def get_graph_relation_representations(self, relation_names_word_ids):
# relation_names_word_ids: num_relation x num_word
relation_name_embeddings, _mask = self.embed(
relation_names_word_ids) # num_relation x num_word x emb
_mask = torch.sum(_mask, -1) # num_relation
relation_name_embeddings = torch.sum(relation_name_embeddings,
1) # num_relation x hid
tmp = torch.eq(_mask, 0).float()
if relation_name_embeddings.is_cuda:
tmp = tmp.cuda()
_mask = _mask + tmp
relation_name_embeddings = relation_name_embeddings / _mask.unsqueeze(
-1)
relation_name_embeddings = relation_name_embeddings.unsqueeze(
0) # 1 x num_relation x emb
relation_ids = np.arange(self.relation_vocab_size) # num_relation
relation_ids = to_pt(relation_ids,
enable_cuda=relation_names_word_ids.is_cuda,
type='long').unsqueeze(0) # 1 x num_relation
relation_embeddings, _ = self.relation_embedding(
relation_ids) # 1 x num_relation x emb
relation_embeddings = torch.cat(
[relation_name_embeddings, relation_embeddings],
dim=-1) # 1 x num_relation x emb+emb
return relation_embeddings
def act_greedy(self, obs, infos, input_observation, input_observation_char,
input_quest, input_quest_char, possible_words):
"""
Acts upon the current list of observations.
One text command must be returned for each observation.
"""
with torch.no_grad():
batch_size = len(obs)
local_word_masks_np = self.get_local_word_masks(possible_words)
local_word_masks = [
to_pt(item, self.use_cuda, type="float")
for item in local_word_masks_np
]
# generate commands for one game step, epsilon greedy is applied, i.e.,
# there is epsilon of chance to generate random commands
action_ranks = self.get_ranks(
input_observation,
input_observation_char,
input_quest,
input_quest_char,
local_word_masks,
use_model="online") # list of batch x vocab
word_indices_maxq = self.choose_maxQ_command(
action_ranks, local_word_masks)
chosen_indices = word_indices_maxq
chosen_strings = self.get_chosen_strings(chosen_indices)
for i in range(batch_size):
if chosen_strings[i] == "wait":
self.not_finished_yet[i] = 0.0
# info for replay memory
for i in range(batch_size):
if self.prev_actions[-1][i] == "wait":
self.prev_step_is_still_interacting[i] = 0.0
# previous step is still interacting, this is because DQN requires one step extra computation
replay_info = [
chosen_indices,
to_pt(self.prev_step_is_still_interacting, self.use_cuda,
"float")
]
# cache new info in current game step into caches
self.prev_actions.append(chosen_strings)
return chosen_strings, replay_info
def act_random(self, obs, infos, input_quest, input_quest_char,
quest_id_list):
with torch.no_grad():
batch_size = len(obs)
# update inputs for answerer
if self.not_finished_yet is None:
self.not_finished_yet = np.ones((len(obs), ), dtype="float32")
self.naozi.push_batch(copy.copy(obs))
else:
for i in range(batch_size):
if self.not_finished_yet[i] == 1.0:
self.naozi.push_one(i, copy.copy(obs[i]))
description_list = self.naozi.get()
input_description, input_description_char, description_id_list = self.get_agent_inputs(
description_list)
ctrlf_word_mask, ctrlf_word_ids = self.get_word_mask(
quest_id_list, description_id_list)
# generate commands for one game step, epsilon greedy is applied, i.e.,
# there is epsilon of chance to generate random commands
action_rank, ctrlf_rank = self.get_ranks(
input_description,
input_description_char,
input_quest,
input_quest_char,
ctrlf_word_mask,
use_model="online") # list of batch x vocab
action_indices = self.choose_random_command(action_rank)
ctrlf_indices = self.choose_random_command(ctrlf_rank,
ctrlf_word_ids)
chosen_strings = self.generate_commands(action_indices,
ctrlf_indices)
for i in range(batch_size):
if chosen_strings[i] == "stop":
self.not_finished_yet[i] = 0.0
# info for replay memory
for i in range(batch_size):
if self.prev_actions[-1][i] == "stop":
self.prev_step_is_still_interacting[i] = 0.0
# previous step is still interacting, this is because DQN requires one step extra computation
replay_info = [
description_list, action_indices, ctrlf_indices,
to_pt(self.prev_step_is_still_interacting, self.use_cuda,
"float")
]
# cache new info in current game step into caches
self.prev_actions.append(chosen_strings)
return chosen_strings, replay_info
def choose_random_command(self, action_rank, mask_word_ids=None):
"""
Generate a command randomly, for epsilon greedy.
"""
batch_size = action_rank.size(0)
action_space_size = action_rank.size(-1)
if mask_word_ids is None:
indices = np.random.choice(action_space_size, batch_size)
else:
indices = []
for j in range(batch_size):
indices.append(np.random.choice(mask_word_ids[j]))
indices = np.array(indices)
action_indices = to_pt(indices,
self.use_cuda).unsqueeze(-1) # batch x 1
return action_indices
def point_random_position(self, point_distribution, mask):
"""
Generate a command by random, for epsilon greedy.
Arguments:
point_distribution: Q values for each position batch x time x 2.
mask: position masks.
"""
batch_size = point_distribution.size(0)
mask_np = to_np(mask) # batch x time
indices = []
for i in range(batch_size):
msk = mask_np[i] # time
indices.append(
np.random.choice(len(msk), 2, p=msk / np.sum(msk, -1)))
indices = to_pt(np.stack(indices, 0), self.use_cuda) # batch x 2
return indices
def get_graph_node_representations(self, node_names_word_ids):
# node_names_word_ids: num_node x num_word
node_name_embeddings, _mask = self.embed(node_names_word_ids) # num_node x num_word x emb
_mask = torch.sum(_mask, -1) # num_node
node_name_embeddings = torch.sum(node_name_embeddings, 1) # num_node x hid
tmp = torch.eq(_mask, 0).float()
if node_name_embeddings.is_cuda:
tmp = tmp.cuda()
_mask = _mask + tmp
node_name_embeddings = node_name_embeddings / _mask.unsqueeze(-1)
node_name_embeddings = node_name_embeddings.unsqueeze(0) # 1 x num_node x emb
node_ids = np.arange(self.node_vocab_size) # num_node
node_ids = to_pt(node_ids, enable_cuda=node_names_word_ids.is_cuda, type='long').unsqueeze(0) # 1 x num_node
node_embeddings, _ = self.node_embedding(node_ids) # 1 x num_node x emb
node_embeddings = torch.cat([node_name_embeddings, node_embeddings], dim=-1) # 1 x num_node x emb+emb
return node_embeddings
def point_maxq_position(self, point_distribution, mask):
"""
Generate a command by maximum q values, for epsilon greedy.
Arguments:
point_distribution: Q values for each position batch x time x 2.
mask: position masks.
"""
point_distribution_np = to_np(point_distribution) # batch x time
mask_np = to_np(mask) # batch x time
point_distribution_np = point_distribution_np - np.min(
point_distribution_np
) + 1e-2 # minus the min value, so that all values are non-negative
point_distribution_np = point_distribution_np * np.expand_dims(
mask_np, -1) # batch x time x 2
indices = np.argmax(point_distribution_np, 1) # batch x 2
indices = to_pt(np.array(indices), self.use_cuda) # batch x 2
return indices
def get_game_step_info(self, obs: List[str], infos: Dict[str, List[Any]]):
"""
Get all the available information, and concat them together to be tensor for
a neural model. we use post padding here, all information are tokenized here.
Arguments:
obs: Previous command's feedback for each game.
infos: Additional information for each game.
"""
word2id = self.vocab.word2id
inventory_id_list = get_token_ids_for_items(infos["inventory"],
word2id,
tokenizer=self.nlp)
feedback_id_list = get_token_ids_for_items(obs,
word2id,
tokenizer=self.nlp)
quest_id_list = get_token_ids_for_items(infos["extra.recipe"],
word2id,
tokenizer=self.nlp)
prev_action_id_list = get_token_ids_for_items(self.prev_actions,
word2id,
tokenizer=self.nlp)
description_id_list = get_token_ids_for_items(infos["description"],
word2id,
tokenizer=self.nlp,
subst_if_empty=['end'])
description_id_list = [
_d + _i + _q + _f + _pa
for (_d, _i, _q, _f, _pa
) in zip(description_id_list, inventory_id_list,
quest_id_list, feedback_id_list, prev_action_id_list)
]
input_description = pad_sequences(
description_id_list,
maxlen=max_len(description_id_list)).astype('int32')
input_description = to_pt(input_description, self.use_cuda)
return input_description, description_id_list
def _choose_random_command(word_ranks, word_masks_np, use_cuda):
"""
Generate a command randomly, for epsilon greedy.
Arguments:
word_ranks: Q values for each word by model.action_scorer.
word_masks_np: Vocabulary masks for words depending on their type (verb, adj, noun, adj2, noun2).
"""
batch_size = word_ranks[0].size(0)
# print("batch_size=", batch_size, len(word_masks_np))
assert len(word_ranks) == len(word_masks_np)
word_ranks_np = [
to_np(item) for item in word_ranks
] # list of (batch x n_vocab) arrays, len=5 (5 word output phrases)
# word_ranks_np = [r - np.min(r) for r in word_ranks_np] # minus the min value, so that all values are non-negative
word_ranks_np = [r * m for r, m in zip(word_ranks_np, word_masks_np)
] # list of batch x n_vocab
word_indices = []
for i in range(
len(word_ranks_np)): # len=5 (verb, adj1, noun1, adj2, noun2)
indices = []
for j in range(batch_size):
msk = word_masks_np[i][
j] # msk is of len = vocab, j is index into batch
indices.append(np.random.choice(
len(msk), p=msk /
np.sum(msk, -1))) # choose from non-zero entries of msk
word_indices.append(np.array(indices))
# word_indices: list of batch
word_qvalues = [[] for _ in word_masks_np]
for i in range(batch_size):
for j in range(len(word_qvalues)):
word_qvalues[j].append(word_ranks[j][i][word_indices[j][i]])
word_qvalues = [torch.stack(item) for item in word_qvalues]
word_indices = [to_pt(item, use_cuda) for item in word_indices]
word_indices = [item.unsqueeze(-1)
for item in word_indices] # list of batch x 1
return word_qvalues, word_indices
def choose_random_command(self,
batch_size,
action_space_size,
possible_words=None):
"""
Generate a command randomly, for epsilon greedy.
"""
action_indices = []
for i in range(3):
if possible_words is None:
indices = np.random.choice(action_space_size, batch_size)
else:
indices = []
for j in range(batch_size):
mask_ids = []
for w in possible_words[i][j]:
if w in self.word2id:
mask_ids.append(self.word2id[w])
indices.append(np.random.choice(mask_ids))
indices = np.array(indices)
action_indices.append(to_pt(indices, self.use_cuda)) # batch
return action_indices
def act(self, obs: List[str], scores: List[int], dones: List[bool], infos: Dict[str, List[Any]]) -> List[str]:
"""
Acts upon the current list of observations.
One text command must be returned for each observation.
Arguments:
obs: Previous command's feedback for each game.
score: The score obtained so far for each game (at previous step).
done: Whether a game is finished (at previous step).
infos: Additional information for each game.
Returns:
Text commands to be performed (one per observation).
Notes:
Commands returned for games marked as `done` have no effect.
The states for finished games are simply copy over until all
games are done, in which case `CustomAgent.finish()` is called
instead.
"""
if not self._epsiode_has_started:
self._start_episode(obs, infos)
if self.mode == "eval":
return self.act_eval(obs, scores, dones, infos)
if self.current_step > 0:
# append scores / dones from previous step into memory
self.scores.append(scores)
self.dones.append(dones)
# compute previous step's rewards and masks
rewards_np, rewards, mask_np, mask = self.compute_reward()
input_description, description_id_list = self.get_game_step_info(obs, infos)
# generate commands for one game step, epsilon greedy is applied, i.e.,
# there is epsilon of chance to generate random commands
word_ranks = self.get_ranks(input_description) # list of batch x vocab
_, word_indices_maxq = self.choose_maxQ_command(word_ranks, self.word_masks_np)
_, word_indices_random = self.choose_random_command(word_ranks, self.word_masks_np)
# random number for epsilon greedy
rand_num = np.random.uniform(low=0.0, high=1.0, size=(input_description.size(0), 1))
less_than_epsilon = (rand_num < self.epsilon).astype("float32") # batch
greater_than_epsilon = 1.0 - less_than_epsilon
less_than_epsilon = to_pt(less_than_epsilon, self.use_cuda, type='float')
greater_than_epsilon = to_pt(greater_than_epsilon, self.use_cuda, type='float')
less_than_epsilon, greater_than_epsilon = less_than_epsilon.long(), greater_than_epsilon.long()
chosen_indices = [less_than_epsilon * idx_random + greater_than_epsilon * idx_maxq for idx_random, idx_maxq in zip(word_indices_random, word_indices_maxq)]
chosen_indices = [item.detach() for item in chosen_indices]
chosen_strings = self.get_chosen_strings(chosen_indices)
self.prev_actions = chosen_strings
# push info from previous game step into replay memory
if self.current_step > 0:
for b in range(len(obs)):
if mask_np[b] == 0:
continue
is_prior = rewards_np[b] > 0.0
self.replay_memory.push(is_prior, self.cache_description_id_list[b], [item[b] for item in self.cache_chosen_indices], rewards[b], mask[b], dones[b], description_id_list[b], [item[b] for item in self.word_masks_np])
# cache new info in current game step into caches
self.cache_description_id_list = description_id_list
self.cache_chosen_indices = chosen_indices
# update neural model by replaying snapshots in replay memory
if self.current_step > 0 and self.current_step % self.update_per_k_game_steps == 0:
loss = self.update()
if loss is not None:
# Backpropagate
self.optimizer.zero_grad()
loss.backward(retain_graph=True)
# `clip_grad_norm` helps prevent the exploding gradient problem in RNNs / LSTMs.
torch.nn.utils.clip_grad_norm_(self.model.parameters(), self.clip_grad_norm)
self.optimizer.step() # apply gradients
self.current_step += 1
if all(dones):
self._end_episode(obs, scores, infos)
return # Nothing to return.
return chosen_strings
def train():
time_1 = datetime.datetime.now()
config = generic.load_config()
agent = Agent(config)
output_dir = "."
data_dir = "."
# make game environments
requested_infos = agent.select_additional_infos_lite()
requested_infos_eval = agent.select_additional_infos()
games_dir = "./"
# training game env
env, _ = reinforcement_learning_dataset.get_training_game_env(
games_dir + config['rl']['data_path'],
config['rl']['difficulty_level'], config['rl']['training_size'],
requested_infos, agent.max_nb_steps_per_episode, agent.batch_size)
if agent.run_eval:
# training game env
eval_env, num_eval_game = reinforcement_learning_dataset.get_evaluation_game_env(
games_dir + config['rl']['data_path'],
config['rl']['difficulty_level'],
requested_infos_eval,
agent.eval_max_nb_steps_per_episode,
agent.eval_batch_size,
valid_or_test="valid")
else:
eval_env, num_eval_game = None, None
# visdom
if config["general"]["visdom"]:
import visdom
viz = visdom.Visdom()
reward_win, step_win = None, None
dqn_loss_win = None
eval_game_points_win, eval_step_win = None, None
viz_game_rewards, viz_game_points, viz_game_points_normalized, viz_graph_rewards, viz_count_rewards, viz_step = [], [], [], [], [], []
viz_dqn_loss = []
viz_eval_game_points, viz_eval_game_points_normalized, viz_eval_step = [], [], []
step_in_total = 0
episode_no = 0
running_avg_game_points = HistoryScoreCache(capacity=500)
running_avg_game_points_normalized = HistoryScoreCache(capacity=500)
running_avg_graph_rewards = HistoryScoreCache(capacity=500)
running_avg_count_rewards = HistoryScoreCache(capacity=500)
running_avg_game_steps = HistoryScoreCache(capacity=500)
running_avg_dqn_loss = HistoryScoreCache(capacity=500)
running_avg_game_rewards = HistoryScoreCache(capacity=500)
json_file_name = agent.experiment_tag.replace(" ", "_")
best_train_performance_so_far, best_eval_performance_so_far = 0.0, 0.0
prev_performance = 0.0
if os.path.exists(data_dir + "/" +
agent.load_graph_generation_model_from_tag + ".pt"):
agent.load_pretrained_graph_generation_model(
data_dir + "/" + agent.load_graph_generation_model_from_tag +
".pt")
else:
print(
"No graph updater module detected... Please check ", data_dir +
"/" + agent.load_graph_generation_model_from_tag + ".pt")
# load model from checkpoint
if agent.load_pretrained:
if os.path.exists(output_dir + "/" + agent.experiment_tag +
"_model.pt"):
agent.load_pretrained_model(output_dir + "/" +
agent.experiment_tag + "_model.pt",
load_partial_graph=False)
agent.update_target_net()
elif os.path.exists(data_dir + "/" + agent.load_from_tag + ".pt"):
agent.load_pretrained_model(data_dir + "/" + agent.load_from_tag +
".pt")
agent.update_target_net()
i_have_seen_these_states = EpisodicCountingMemory(
) # episodic counting based memory
i_am_patient = 0
perfect_training = 0
while (True):
if episode_no > agent.max_episode:
break
np.random.seed(episode_no)
env.seed(episode_no)
obs, infos = env.reset()
# filter look and examine actions
for commands_ in infos["admissible_commands"]:
for cmd_ in [
cmd for cmd in commands_ if cmd != "examine cookbook"
and cmd.split()[0] in ["examine", "look"]
]:
commands_.remove(cmd_)
batch_size = len(obs)
agent.train()
agent.init()
game_name_list = [
game.metadata["uuid"].split("-")[-1] for game in infos["game"]
]
game_max_score_list = [game.max_score for game in infos["game"]]
i_have_seen_these_states.reset(
) # reset episodic counting based memory
prev_triplets, chosen_actions = [], []
prev_step_dones, prev_rewards = [], []
for _ in range(batch_size):
prev_triplets.append([])
chosen_actions.append("restart")
prev_step_dones.append(0.0)
prev_rewards.append(0.0)
prev_h, prev_c = None, None
observation_strings, action_candidate_list = agent.get_game_info_at_certain_step_lite(
obs, infos)
observation_for_counting = copy.copy(observation_strings)
observation_strings = [
item + " <sep> " + a
for item, a in zip(observation_strings, chosen_actions)
]
# generate g_belief begins
generated_commands = agent.command_generation_greedy_generation(
observation_strings, prev_triplets)
current_triplets = agent.update_knowledge_graph_triplets(
prev_triplets, generated_commands)
# generate g_belief ends
i_have_seen_these_states.push(
current_triplets) # update init triplets into memory
if agent.count_reward_lambda > 0:
agent.reset_binarized_counter(batch_size)
_ = agent.get_binarized_count(observation_for_counting)
# it requires to store sequences of transitions into memory with order,
# so we use a cache to keep what agents returns, and push them into memory
# altogether in the end of game.
transition_cache = []
still_running_mask = []
game_rewards, game_points, graph_rewards, count_rewards = [], [], [], []
print_actions = []
act_randomly = False if agent.noisy_net else episode_no < agent.learn_start_from_this_episode
for step_no in range(agent.max_nb_steps_per_episode):
if agent.noisy_net:
agent.reset_noise() # Draw a new set of noisy weights
new_chosen_actions, chosen_indices, prev_h, prev_c = agent.act(
observation_strings,
current_triplets,
action_candidate_list,
previous_h=prev_h,
previous_c=prev_c,
random=act_randomly)
replay_info = [
observation_strings, action_candidate_list, chosen_indices,
current_triplets, chosen_actions
]
transition_cache.append(replay_info)
chosen_actions = new_chosen_actions
chosen_actions_before_parsing = [
item[idx] for item, idx in zip(infos["admissible_commands"],
chosen_indices)
]
obs, scores, dones, infos = env.step(chosen_actions_before_parsing)
# filter look and examine actions
for commands_ in infos["admissible_commands"]:
for cmd_ in [
cmd for cmd in commands_ if cmd != "examine cookbook"
and cmd.split()[0] in ["examine", "look"]
]:
commands_.remove(cmd_)
prev_triplets = current_triplets
observation_strings, action_candidate_list = agent.get_game_info_at_certain_step_lite(
obs, infos)
observation_for_counting = copy.copy(observation_strings)
observation_strings = [
item + " <sep> " + a
for item, a in zip(observation_strings, chosen_actions)
]
# generate g_belief begins
generated_commands = agent.command_generation_greedy_generation(
observation_strings, prev_triplets)
current_triplets = agent.update_knowledge_graph_triplets(
prev_triplets, generated_commands)
# generate g_belief ends
has_not_seen = i_have_seen_these_states.has_not_seen(
current_triplets)
i_have_seen_these_states.push(
current_triplets) # update init triplets into memory
if agent.noisy_net and step_in_total % agent.update_per_k_game_steps == 0:
agent.reset_noise() # Draw a new set of noisy weights
if episode_no >= agent.learn_start_from_this_episode and step_in_total % agent.update_per_k_game_steps == 0:
dqn_loss, _ = agent.update_dqn(episode_no)
if dqn_loss is not None:
running_avg_dqn_loss.push(dqn_loss)
if step_no == agent.max_nb_steps_per_episode - 1:
# terminate the game because DQN requires one extra step
dones = [True for _ in dones]
step_in_total += 1
still_running = [1.0 - float(item)
for item in prev_step_dones] # list of float
prev_step_dones = dones
step_rewards = [
float(curr) - float(prev)
for curr, prev in zip(scores, prev_rewards)
] # list of float
game_points.append(copy.copy(step_rewards))
if agent.use_negative_reward:
step_rewards = [
-1.0 if _lost else r
for r, _lost in zip(step_rewards, infos["has_lost"])
] # list of float
step_rewards = [
5.0 if _won else r
for r, _won in zip(step_rewards, infos["has_won"])
] # list of float
prev_rewards = scores
if agent.fully_observable_graph:
step_graph_rewards = [0.0 for _ in range(batch_size)]
else:
step_graph_rewards = agent.get_graph_rewards(
prev_triplets, current_triplets) # list of float
step_graph_rewards = [
r * float(m)
for r, m in zip(step_graph_rewards, has_not_seen)
]
# counting bonus
if agent.count_reward_lambda > 0:
step_revisit_counting_rewards = agent.get_binarized_count(
observation_for_counting, update=True)
step_revisit_counting_rewards = [
r * agent.count_reward_lambda
for r in step_revisit_counting_rewards
]
else:
step_revisit_counting_rewards = [
0.0 for _ in range(batch_size)
]
still_running_mask.append(still_running)
game_rewards.append(step_rewards)
graph_rewards.append(step_graph_rewards)
count_rewards.append(step_revisit_counting_rewards)
print_actions.append(
chosen_actions_before_parsing[0] if still_running[0] else "--")
# if all ended, break
if np.sum(still_running) == 0:
break
still_running_mask_np = np.array(still_running_mask)
game_rewards_np = np.array(
game_rewards) * still_running_mask_np # step x batch
game_points_np = np.array(
game_points) * still_running_mask_np # step x batch
graph_rewards_np = np.array(
graph_rewards) * still_running_mask_np # step x batch
count_rewards_np = np.array(
count_rewards) * still_running_mask_np # step x batch
if agent.graph_reward_lambda > 0.0:
graph_rewards_pt = generic.to_pt(graph_rewards_np,
enable_cuda=agent.use_cuda,
type='float') # step x batch
else:
graph_rewards_pt = generic.to_pt(np.zeros_like(graph_rewards_np),
enable_cuda=agent.use_cuda,
type='float') # step x batch
if agent.count_reward_lambda > 0.0:
count_rewards_pt = generic.to_pt(count_rewards_np,
enable_cuda=agent.use_cuda,
type='float') # step x batch
else:
count_rewards_pt = generic.to_pt(np.zeros_like(count_rewards_np),
enable_cuda=agent.use_cuda,
type='float') # step x batch
command_rewards_pt = generic.to_pt(game_rewards_np,
enable_cuda=agent.use_cuda,
type='float') # step x batch
# push experience into replay buffer (dqn)
avg_rewards_in_buffer = agent.dqn_memory.avg_rewards()
for b in range(game_rewards_np.shape[1]):
if still_running_mask_np.shape[
0] == agent.max_nb_steps_per_episode and still_running_mask_np[
-1][b] != 0:
# need to pad one transition
_need_pad = True
tmp_game_rewards = game_rewards_np[:, b].tolist() + [0.0]
else:
_need_pad = False
tmp_game_rewards = game_rewards_np[:, b]
if np.mean(
tmp_game_rewards
) < avg_rewards_in_buffer * agent.buffer_reward_threshold:
continue
for i in range(game_rewards_np.shape[0]):
observation_strings, action_candidate_list, chosen_indices, _triplets, prev_action_strings = transition_cache[
i]
is_final = True
if still_running_mask_np[i][b] != 0:
is_final = False
agent.dqn_memory.add(
observation_strings[b], prev_action_strings[b],
action_candidate_list[b], chosen_indices[b], _triplets[b],
command_rewards_pt[i][b], graph_rewards_pt[i][b],
count_rewards_pt[i][b], is_final)
if still_running_mask_np[i][b] == 0:
break
if _need_pad:
observation_strings, action_candidate_list, chosen_indices, _triplets, prev_action_strings = transition_cache[
-1]
agent.dqn_memory.add(observation_strings[b],
prev_action_strings[b],
action_candidate_list[b],
chosen_indices[b], _triplets[b],
command_rewards_pt[-1][b] * 0.0,
graph_rewards_pt[-1][b] * 0.0,
count_rewards_pt[-1][b] * 0.0, True)
for b in range(batch_size):
running_avg_game_points.push(np.sum(game_points_np, 0)[b])
game_max_score_np = np.array(game_max_score_list, dtype="float32")
running_avg_game_points_normalized.push(
(np.sum(game_points_np, 0) / game_max_score_np)[b])
running_avg_game_steps.push(np.sum(still_running_mask_np, 0)[b])
running_avg_game_rewards.push(np.sum(game_rewards_np, 0)[b])
running_avg_graph_rewards.push(np.sum(graph_rewards_np, 0)[b])
running_avg_count_rewards.push(np.sum(count_rewards_np, 0)[b])
# finish game
agent.finish_of_episode(episode_no, batch_size)
episode_no += batch_size
if episode_no < agent.learn_start_from_this_episode:
continue
if agent.report_frequency == 0 or (
episode_no % agent.report_frequency >
(episode_no - batch_size) % agent.report_frequency):
continue
time_2 = datetime.datetime.now()
print(
"Episode: {:3d} | time spent: {:s} | dqn loss: {:2.3f} | game points: {:2.3f} | normalized game points: {:2.3f} | game rewards: {:2.3f} | graph rewards: {:2.3f} | count rewards: {:2.3f} | used steps: {:2.3f}"
.format(episode_no,
str(time_2 - time_1).rsplit(".")[0],
running_avg_dqn_loss.get_avg(),
running_avg_game_points.get_avg(),
running_avg_game_points_normalized.get_avg(),
running_avg_game_rewards.get_avg(),
running_avg_graph_rewards.get_avg(),
running_avg_count_rewards.get_avg(),
running_avg_game_steps.get_avg()))
print(game_name_list[0] + ": " + " | ".join(print_actions))
# evaluate
curr_train_performance = running_avg_game_points_normalized.get_avg()
eval_game_points, eval_game_points_normalized, eval_game_step = 0.0, 0.0, 0.0
eval_command_generation_f1 = 0.0
if agent.run_eval:
eval_game_points, eval_game_points_normalized, eval_game_step, eval_command_generation_f1, detailed_scores = evaluate.evaluate_belief_mode(
eval_env, agent, num_eval_game)
curr_eval_performance = eval_game_points_normalized
curr_performance = curr_eval_performance
if curr_eval_performance > best_eval_performance_so_far:
best_eval_performance_so_far = curr_eval_performance
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag + "_model.pt")
elif curr_eval_performance == best_eval_performance_so_far:
if curr_eval_performance > 0.0:
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag +
"_model.pt")
else:
if curr_train_performance >= best_train_performance_so_far:
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag +
"_model.pt")
else:
curr_eval_performance = 0.0
detailed_scores = ""
curr_performance = curr_train_performance
if curr_train_performance >= best_train_performance_so_far:
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag + "_model.pt")
# update best train performance
if curr_train_performance >= best_train_performance_so_far:
best_train_performance_so_far = curr_train_performance
if prev_performance <= curr_performance:
i_am_patient = 0
else:
i_am_patient += 1
prev_performance = curr_performance
# if patient >= patience, resume from checkpoint
if agent.patience > 0 and i_am_patient >= agent.patience:
if os.path.exists(output_dir + "/" + agent.experiment_tag +
"_model.pt"):
print('reload from a good checkpoint...')
agent.load_pretrained_model(output_dir + "/" +
agent.experiment_tag + "_model.pt",
load_partial_graph=False)
agent.update_target_net()
i_am_patient = 0
if running_avg_game_points_normalized.get_avg() >= 0.95:
perfect_training += 1
else:
perfect_training = 0
# plot using visdom
if config["general"]["visdom"]:
viz_game_rewards.append(running_avg_game_rewards.get_avg())
viz_game_points.append(running_avg_game_points.get_avg())
viz_game_points_normalized.append(
running_avg_game_points_normalized.get_avg())
viz_graph_rewards.append(running_avg_graph_rewards.get_avg())
viz_count_rewards.append(running_avg_count_rewards.get_avg())
viz_step.append(running_avg_game_steps.get_avg())
viz_dqn_loss.append(running_avg_dqn_loss.get_avg())
viz_eval_game_points.append(eval_game_points)
viz_eval_game_points_normalized.append(eval_game_points_normalized)
viz_eval_step.append(eval_game_step)
viz_x = np.arange(len(viz_game_rewards)).tolist()
if reward_win is None:
reward_win = viz.line(X=viz_x,
Y=viz_game_rewards,
opts=dict(title=agent.experiment_tag +
"_game_rewards"),
name="game_rewards")
viz.line(X=viz_x,
Y=viz_graph_rewards,
opts=dict(title=agent.experiment_tag +
"_graph_rewards"),
win=reward_win,
update='append',
name="graph_rewards")
viz.line(X=viz_x,
Y=viz_count_rewards,
opts=dict(title=agent.experiment_tag +
"_count_rewards"),
win=reward_win,
update='append',
name="count_rewards")
viz.line(X=viz_x,
Y=viz_game_points,
opts=dict(title=agent.experiment_tag +
"_game_points"),
win=reward_win,
update='append',
name="game_points")
viz.line(X=viz_x,
Y=viz_game_points_normalized,
opts=dict(title=agent.experiment_tag +
"_game_points_normalized"),
win=reward_win,
update='append',
name="game_points_normalized")
else:
viz.line(X=[len(viz_game_rewards) - 1],
Y=[viz_game_rewards[-1]],
opts=dict(title=agent.experiment_tag +
"_game_rewards"),
win=reward_win,
update='append',
name="game_rewards")
viz.line(X=[len(viz_graph_rewards) - 1],
Y=[viz_graph_rewards[-1]],
opts=dict(title=agent.experiment_tag +
"_graph_rewards"),
win=reward_win,
update='append',
name="graph_rewards")
viz.line(X=[len(viz_count_rewards) - 1],
Y=[viz_count_rewards[-1]],
opts=dict(title=agent.experiment_tag +
"_count_rewards"),
win=reward_win,
update='append',
name="count_rewards")
viz.line(X=[len(viz_game_points) - 1],
Y=[viz_game_points[-1]],
opts=dict(title=agent.experiment_tag +
"_game_points"),
win=reward_win,
update='append',
name="game_points")
viz.line(X=[len(viz_game_points_normalized) - 1],
Y=[viz_game_points_normalized[-1]],
opts=dict(title=agent.experiment_tag +
"_game_points_normalized"),
win=reward_win,
update='append',
name="game_points_normalized")
if step_win is None:
step_win = viz.line(X=viz_x,
Y=viz_step,
opts=dict(title=agent.experiment_tag +
"_step"),
name="step")
else:
viz.line(X=[len(viz_step) - 1],
Y=[viz_step[-1]],
opts=dict(title=agent.experiment_tag + "_step"),
win=step_win,
update='append',
name="step")
if dqn_loss_win is None:
dqn_loss_win = viz.line(X=viz_x,
Y=viz_dqn_loss,
opts=dict(title=agent.experiment_tag +
"_dqn_loss"),
name="dqn loss")
else:
viz.line(X=[len(viz_dqn_loss) - 1],
Y=[viz_dqn_loss[-1]],
opts=dict(title=agent.experiment_tag + "_dqn_loss"),
win=dqn_loss_win,
update='append',
name="dqn loss")
if eval_game_points_win is None:
eval_game_points_win = viz.line(
X=viz_x,
Y=viz_eval_game_points,
opts=dict(title=agent.experiment_tag +
"_eval_game_points"),
name="eval game points")
viz.line(X=viz_x,
Y=viz_eval_game_points_normalized,
opts=dict(title=agent.experiment_tag +
"_eval_game_points_normalized"),
win=eval_game_points_win,
update='append',
name="eval_game_points_normalized")
else:
viz.line(X=[len(viz_eval_game_points) - 1],
Y=[viz_eval_game_points[-1]],
opts=dict(title=agent.experiment_tag +
"_eval_game_points"),
win=eval_game_points_win,
update='append',
name="eval game_points")
viz.line(X=[len(viz_eval_game_points_normalized) - 1],
Y=[viz_eval_game_points_normalized[-1]],
opts=dict(title=agent.experiment_tag +
"_eval_game_points_normalized"),
win=eval_game_points_win,
update='append',
name="eval_game_points_normalized")
if eval_step_win is None:
eval_step_win = viz.line(X=viz_x,
Y=viz_eval_step,
opts=dict(title=agent.experiment_tag +
"_eval_step"),
name="eval step")
else:
viz.line(X=[len(viz_eval_step) - 1],
Y=[viz_eval_step[-1]],
opts=dict(title=agent.experiment_tag + "_eval_step"),
win=eval_step_win,
update='append',
name="eval step")
# write accuracies down into file
_s = json.dumps({
"time spent":
str(time_2 - time_1).rsplit(".")[0],
"dqn loss":
str(running_avg_dqn_loss.get_avg()),
"train game points":
str(running_avg_game_points.get_avg()),
"train normalized game points":
str(running_avg_game_points_normalized.get_avg()),
"train game rewards":
str(running_avg_game_rewards.get_avg()),
"train graph rewards":
str(running_avg_graph_rewards.get_avg()),
"train count rewards":
str(running_avg_count_rewards.get_avg()),
"train steps":
str(running_avg_game_steps.get_avg()),
"eval game points":
str(eval_game_points),
"eval normalized game points":
str(eval_game_points_normalized),
"eval command generation f1":
str(eval_command_generation_f1),
"eval steps":
str(eval_game_step),
"detailed scores":
detailed_scores
})
with open(output_dir + "/" + json_file_name + '.json',
'a+') as outfile:
outfile.write(_s + '\n')
outfile.flush()
if curr_performance == 1.0 and curr_train_performance >= 0.95:
break
if perfect_training >= 3:
break
def train():
time_1 = datetime.datetime.now()
with open("config.yaml") as reader:
config = yaml.safe_load(reader)
if config['general']['dataset'] == "squad":
env = GamifiedSquad(config)
else:
env = GamifiedNewsQA(config)
env.split_reset("train")
agent = Agent()
# visdom
viz = visdom.Visdom()
plt_win = None
eval_plt_win = None
plt_q_value_win = None
plt_steps_win = None
eval_plt_steps_win = None
viz_avg_correct_state_acc, viz_avg_qa_acc = [], []
viz_avg_correct_state_q_value = []
viz_eval_correct_state_acc, viz_eval_qa_acc, viz_eval_steps = [], [], []
viz_avg_steps = []
step_in_total = 0
episode_no = 0
running_avg_qa_acc = HistoryScoreCache(capacity=50)
running_avg_correct_state_acc = HistoryScoreCache(capacity=50)
running_avg_qa_loss = HistoryScoreCache(capacity=50)
running_avg_correct_state_loss = HistoryScoreCache(capacity=50)
running_avg_correct_state_q_value = HistoryScoreCache(capacity=50)
running_avg_steps = HistoryScoreCache(capacity=50)
output_dir, data_dir = ".", "."
json_file_name = agent.experiment_tag.replace(" ", "_")
best_qa_acc_so_far = 0.0
# load model from checkpoint
if agent.load_pretrained:
if os.path.exists(output_dir + "/" + agent.experiment_tag +
"_model.pt"):
agent.load_pretrained_model(output_dir + "/" +
agent.experiment_tag + "_model.pt")
agent.update_target_net()
elif os.path.exists(data_dir + "/" + agent.load_from_tag + ".pt"):
agent.load_pretrained_model(data_dir + "/" + agent.load_from_tag +
".pt")
agent.update_target_net()
while (True):
if episode_no > agent.max_episode:
break
np.random.seed(episode_no)
env.seed(episode_no)
obs, infos = env.reset()
print(
"====================================================================================",
episode_no)
print("-- Q: %s" % (infos[0]["q"].encode('utf-8')))
print("-- A: %s" % (infos[0]["a"][0].encode('utf-8')))
agent.train()
agent.init(obs, infos)
quest_list = agent.get_game_quest_info(infos)
input_quest, input_quest_char, quest_id_list = agent.get_agent_inputs(
quest_list)
tmp_replay_buffer = []
print_cmds = []
batch_size = len(obs)
act_randomly = False if agent.noisy_net else episode_no < agent.learn_start_from_this_episode
for step_no in range(agent.max_nb_steps_per_episode):
# generate commands
if agent.noisy_net:
agent.reset_noise() # Draw a new set of noisy weights
commands, replay_info = agent.act(obs,
infos,
input_quest,
input_quest_char,
quest_id_list,
random=act_randomly)
obs, infos = env.step(commands)
if agent.noisy_net and step_in_total % agent.update_per_k_game_steps == 0:
agent.reset_noise() # Draw a new set of noisy weights
if episode_no >= agent.learn_start_from_this_episode and step_in_total % agent.update_per_k_game_steps == 0:
interaction_loss, interaction_q_value = agent.update_interaction(
)
if interaction_loss is not None:
running_avg_correct_state_loss.push(interaction_loss)
running_avg_correct_state_q_value.push(interaction_q_value)
qa_loss = agent.update_qa()
if qa_loss is not None:
running_avg_qa_loss.push(qa_loss)
step_in_total += 1
still_running = generic.to_np(replay_info[-1])
print_cmds.append(commands[0] if still_running[0] else "--")
# force stopping
if step_no == agent.max_nb_steps_per_episode - 1:
replay_info[-1] = torch.zeros_like(replay_info[-1])
tmp_replay_buffer.append(replay_info)
if np.sum(still_running) == 0:
break
print(" / ".join(print_cmds).encode('utf-8'))
# The agent has exhausted all steps, now answer question.
chosen_head_tails = agent.answer_question_act(agent.naozi.get(),
quest_list) # batch
chosen_head_tails_np = generic.to_np(chosen_head_tails)
chosen_answer_strings = generic.get_answer_strings(
agent.naozi.get(), chosen_head_tails_np)
answer_strings = [item["a"] for item in infos]
qa_reward_np = generic.get_qa_reward(chosen_answer_strings,
answer_strings)
correct_state_reward_np = generic.get_sufficient_info_reward(
agent.naozi.get(), answer_strings)
correct_state_reward = generic.to_pt(correct_state_reward_np,
enable_cuda=agent.use_cuda,
type='float') # batch
# push qa experience into qa replay buffer
for b in range(batch_size): # data points in batch
is_prior = qa_reward_np[
b] > agent.qa_reward_prior_threshold * agent.qa_replay_memory.avg_rewards(
)
# if the agent is not in the correct state, do not push it into replay buffer
if np.mean(correct_state_reward_np[b]) == 0.0:
continue
agent.qa_replay_memory.push(is_prior, qa_reward_np[b],
agent.naozi.get(b), quest_list[b],
answer_strings[b])
# small positive reward whenever it answers question correctly
masks_np = [generic.to_np(item[-1]) for item in tmp_replay_buffer]
command_rewards_np = []
for i in range(len(tmp_replay_buffer)):
if i == len(tmp_replay_buffer) - 1:
r = correct_state_reward * tmp_replay_buffer[i][-1]
r_np = correct_state_reward_np * masks_np[i]
else:
# give reward only at that one game step, not all
r = correct_state_reward * (tmp_replay_buffer[i][-1] -
tmp_replay_buffer[i + 1][-1])
r_np = correct_state_reward_np * (masks_np[i] -
masks_np[i + 1])
tmp_replay_buffer[i].append(r)
command_rewards_np.append(r_np)
command_rewards_np = np.array(command_rewards_np)
print(command_rewards_np[:, 0])
# push experience into replay buffer
for b in range(len(correct_state_reward_np)):
is_prior = np.sum(command_rewards_np, 0)[b] > 0.0
for i in range(len(tmp_replay_buffer)):
batch_description_list, batch_chosen_indices, batch_chosen_ctrlf_indices, _, batch_rewards = tmp_replay_buffer[
i]
is_final = True
if masks_np[i][b] != 0:
is_final = False
agent.replay_memory.push(is_prior, batch_description_list[b],
quest_list[b],
batch_chosen_indices[b],
batch_chosen_ctrlf_indices[b],
batch_rewards[b], is_final)
if masks_np[i][b] == 0.0:
break
qa_acc = np.mean(qa_reward_np)
correct_state_acc = np.mean(correct_state_reward_np)
step_masks_np = np.sum(np.array(masks_np), 0) # batch
for i in range(len(qa_reward_np)):
# if the answer is totally wrong, we assume it used all steps
if qa_reward_np[i] == 0.0:
step_masks_np[i] = agent.max_nb_steps_per_episode
used_steps = np.mean(step_masks_np)
running_avg_qa_acc.push(qa_acc)
running_avg_correct_state_acc.push(correct_state_acc)
running_avg_steps.push(used_steps)
print_rewards = np.sum(np.mean(command_rewards_np, -1))
obs_string = agent.naozi.get(0)
print("-- OBS: %s" % (obs_string.encode('utf-8')))
print("-- PRED: %s" % (chosen_answer_strings[0].encode('utf-8')))
# finish game
agent.finish_of_episode(episode_no, batch_size)
episode_no += batch_size
time_2 = datetime.datetime.now()
print(
"Episode: {:3d} | time spent: {:s} | interaction loss: {:2.3f} | interaction qvalue: {:2.3f} | qa loss: {:2.3f} | rewards: {:2.3f} | qa acc: {:2.3f}/{:2.3f} | sufficient info: {:2.3f}/{:2.3f} | used steps: {:2.3f}"
.format(episode_no,
str(time_2 - time_1).rsplit(".")[0],
running_avg_correct_state_loss.get_avg(),
running_avg_correct_state_q_value.get_avg(),
running_avg_qa_loss.get_avg(), print_rewards, qa_acc,
running_avg_qa_acc.get_avg(), correct_state_acc,
running_avg_correct_state_acc.get_avg(),
running_avg_steps.get_avg()))
if episode_no < agent.learn_start_from_this_episode:
continue
if agent.report_frequency == 0 or (
episode_no % agent.report_frequency >
(episode_no - batch_size) % agent.report_frequency):
continue
eval_qa_acc, eval_correct_state_acc, eval_used_steps = 0.0, 0.0, 0.0
# evaluate
if agent.run_eval:
eval_qa_acc, eval_correct_state_acc, eval_used_steps = evaluate.evaluate(
env, agent, "valid")
env.split_reset("train")
# if run eval, then save model by eval accucacy
if agent.save_frequency > 0 and (
episode_no % agent.report_frequency <=
(episode_no - batch_size) % agent.report_frequency
) and eval_qa_acc > best_qa_acc_so_far:
best_qa_acc_so_far = eval_qa_acc
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag + "_model.pt")
# save model
elif agent.save_frequency > 0 and (
episode_no % agent.report_frequency <=
(episode_no - batch_size) % agent.report_frequency):
if running_avg_qa_acc.get_avg() > best_qa_acc_so_far:
best_qa_acc_so_far = running_avg_qa_acc.get_avg()
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag + "_model.pt")
# plot using visdom
viz_avg_correct_state_acc.append(
running_avg_correct_state_acc.get_avg())
viz_avg_qa_acc.append(running_avg_qa_acc.get_avg())
viz_avg_correct_state_q_value.append(
running_avg_correct_state_q_value.get_avg())
viz_eval_correct_state_acc.append(eval_correct_state_acc)
viz_eval_qa_acc.append(eval_qa_acc)
viz_eval_steps.append(eval_used_steps)
viz_avg_steps.append(running_avg_steps.get_avg())
viz_x = np.arange(len(viz_avg_correct_state_acc)).tolist()
if plt_win is None:
plt_win = viz.line(X=viz_x,
Y=viz_avg_correct_state_acc,
opts=dict(title=agent.experiment_tag +
"_train"),
name="sufficient info")
viz.line(X=viz_x,
Y=viz_avg_qa_acc,
opts=dict(title=agent.experiment_tag + "_train"),
win=plt_win,
update='append',
name="qa")
else:
viz.line(X=[len(viz_avg_correct_state_acc) - 1],
Y=[viz_avg_correct_state_acc[-1]],
opts=dict(title=agent.experiment_tag + "_train"),
win=plt_win,
update='append',
name="sufficient info")
viz.line(X=[len(viz_avg_qa_acc) - 1],
Y=[viz_avg_qa_acc[-1]],
opts=dict(title=agent.experiment_tag + "_train"),
win=plt_win,
update='append',
name="qa")
if plt_q_value_win is None:
plt_q_value_win = viz.line(X=viz_x,
Y=viz_avg_correct_state_q_value,
opts=dict(title=agent.experiment_tag +
"_train_q_value"),
name="sufficient info")
else:
viz.line(X=[len(viz_avg_correct_state_q_value) - 1],
Y=[viz_avg_correct_state_q_value[-1]],
opts=dict(title=agent.experiment_tag + "_train_q_value"),
win=plt_q_value_win,
update='append',
name="sufficient info")
if plt_steps_win is None:
plt_steps_win = viz.line(X=viz_x,
Y=viz_avg_steps,
opts=dict(title=agent.experiment_tag +
"_train_step"),
name="used steps")
else:
viz.line(X=[len(viz_avg_steps) - 1],
Y=[viz_avg_steps[-1]],
opts=dict(title=agent.experiment_tag + "_train_step"),
win=plt_steps_win,
update='append',
name="used steps")
if eval_plt_win is None:
eval_plt_win = viz.line(X=viz_x,
Y=viz_eval_correct_state_acc,
opts=dict(title=agent.experiment_tag +
"_eval"),
name="sufficient info")
viz.line(X=viz_x,
Y=viz_eval_qa_acc,
opts=dict(title=agent.experiment_tag + "_eval"),
win=eval_plt_win,
update='append',
name="qa")
else:
viz.line(X=[len(viz_eval_correct_state_acc) - 1],
Y=[viz_eval_correct_state_acc[-1]],
opts=dict(title=agent.experiment_tag + "_eval"),
win=eval_plt_win,
update='append',
name="sufficient info")
viz.line(X=[len(viz_eval_qa_acc) - 1],
Y=[viz_eval_qa_acc[-1]],
opts=dict(title=agent.experiment_tag + "_eval"),
win=eval_plt_win,
update='append',
name="qa")
if eval_plt_steps_win is None:
eval_plt_steps_win = viz.line(
X=viz_x,
Y=viz_eval_steps,
opts=dict(title=agent.experiment_tag + "_eval_step"),
name="used steps")
else:
viz.line(X=[len(viz_avg_steps) - 1],
Y=[viz_eval_steps[-1]],
opts=dict(title=agent.experiment_tag + "_eval_step"),
win=eval_plt_steps_win,
update='append',
name="used steps")
# write accucacies down into file
_s = json.dumps({
"time spent":
str(time_2 - time_1).rsplit(".")[0],
"sufficient info":
str(running_avg_correct_state_acc.get_avg()),
"qa":
str(running_avg_qa_acc.get_avg()),
"sufficient qvalue":
str(running_avg_correct_state_q_value.get_avg()),
"eval sufficient info":
str(eval_correct_state_acc),
"eval qa":
str(eval_qa_acc),
"eval steps":
str(eval_used_steps),
"used steps":
str(running_avg_steps.get_avg())
})
with open(output_dir + "/" + json_file_name + '.json',
'a+') as outfile:
outfile.write(_s + '\n')
outfile.flush()
def act(self,
obs,
infos,
input_quest,
input_quest_char,
quest_id_list,
random=False):
with torch.no_grad():
if self.mode == "eval":
return self.act_greedy(obs, infos, input_quest,
input_quest_char, quest_id_list)
if random:
return self.act_random(obs, infos, input_quest,
input_quest_char, quest_id_list)
batch_size = len(obs)
# update inputs for answerer
if self.not_finished_yet is None:
self.not_finished_yet = np.ones((len(obs), ), dtype="float32")
self.naozi.push_batch(copy.copy(obs))
else:
for i in range(batch_size):
if self.not_finished_yet[i] == 1.0:
self.naozi.push_one(i, copy.copy(obs[i]))
description_list = self.naozi.get()
input_description, input_description_char, description_id_list = self.get_agent_inputs(
description_list)
ctrlf_word_mask, ctrlf_word_ids = self.get_word_mask(
quest_id_list, description_id_list)
# generate commands for one game step, epsilon greedy is applied, i.e.,
# there is epsilon of chance to generate random commands
action_rank, ctrlf_rank = self.get_ranks(
input_description,
input_description_char,
input_quest,
input_quest_char,
ctrlf_word_mask,
use_model="online") # list of batch x vocab
action_indices_maxq = self.choose_maxQ_command(action_rank)
action_indices_random = self.choose_random_command(action_rank)
ctrlf_indices_maxq = self.choose_maxQ_command(
ctrlf_rank, ctrlf_word_mask)
ctrlf_indices_random = self.choose_random_command(
ctrlf_rank, ctrlf_word_ids)
# random number for epsilon greedy
rand_num = np.random.uniform(low=0.0,
high=1.0,
size=(input_description.size(0), 1))
less_than_epsilon = (rand_num < self.epsilon).astype(
"float32") # batch
greater_than_epsilon = 1.0 - less_than_epsilon
less_than_epsilon = to_pt(less_than_epsilon,
self.use_cuda,
type='long')
greater_than_epsilon = to_pt(greater_than_epsilon,
self.use_cuda,
type='long')
chosen_indices = less_than_epsilon * action_indices_random + greater_than_epsilon * action_indices_maxq
chosen_ctrlf_indices = less_than_epsilon * ctrlf_indices_random + greater_than_epsilon * ctrlf_indices_maxq
chosen_strings = self.generate_commands(chosen_indices,
chosen_ctrlf_indices)
for i in range(batch_size):
if chosen_strings[i] == "stop":
self.not_finished_yet[i] = 0.0
# info for replay memory
for i in range(batch_size):
if self.prev_actions[-1][i] == "stop":
self.prev_step_is_still_interacting[i] = 0.0
# previous step is still interacting, this is because DQN requires one step extra computation
replay_info = [
description_list, chosen_indices, chosen_ctrlf_indices,
to_pt(self.prev_step_is_still_interacting, self.use_cuda,
"float")
]
# cache new info in current game step into caches
self.prev_actions.append(chosen_strings)
return chosen_strings, replay_info
def answer_question(self,
input_observation,
input_observation_char,
observation_id_list,
input_quest,
input_quest_char,
use_model="online"):
# first pad answerer_input, and get the mask
model = self.online_net if use_model == "online" else self.target_net
batch_size = len(observation_id_list)
max_length = input_observation.size(1)
mask = compute_mask(input_observation) # batch x obs_len
# noun mask for location question
if self.question_type in ["location"]:
location_mask = []
for i in range(batch_size):
m = [1 for item in observation_id_list[i]]
location_mask.append(m)
location_mask = pad_sequences(location_mask,
maxlen=max_length,
dtype="float32")
location_mask = to_pt(location_mask,
enable_cuda=self.use_cuda,
type='float')
assert mask.size() == location_mask.size()
mask = mask * location_mask
match_representation_sequence = self.get_match_representations(
input_observation,
input_observation_char,
input_quest,
input_quest_char,
use_model=use_model)
pred = model.answer_question(match_representation_sequence,
mask) # batch x vocab or batch x 2
# attention sum:
# sometimes certain word appears multiple times in the observation,
# thus we need to merge them together before doing further computations
# ------- but
# if answer type is not pointing, we just use a pre-defined mapping
# that maps 0/1 to their positions in vocab
if self.answer_type == "2 way":
observation_id_list = []
max_length = 2
for i in range(batch_size):
observation_id_list.append(
[self.word2id["0"], self.word2id["1"]])
observation = to_pt(
pad_sequences(observation_id_list,
maxlen=max_length).astype('int32'), self.use_cuda)
vocab_distribution = np.zeros(
(batch_size, len(self.word_vocab))) # batch x vocab
vocab_distribution = to_pt(vocab_distribution,
self.use_cuda,
type='float')
vocab_distribution = vocab_distribution.scatter_add_(
1, observation, pred) # batch x vocab
non_zero_words = []
for i in range(batch_size):
non_zero_words.append(list(set(observation_id_list[i])))
vocab_mask = torch.ne(vocab_distribution, 0).float()
return vocab_distribution, non_zero_words, vocab_mask
def get_dqn_loss(self):
"""
Update neural model in agent. In this example we follow algorithm
of updating model in dqn with replay memory.
"""
if len(self.command_generation_replay_memory) < self.replay_batch_size:
return None
data = self.command_generation_replay_memory.get_batch(
self.replay_batch_size, self.multi_step)
if data is None:
return None
obs_list, quest_list, possible_words_list, chosen_indices, rewards, next_obs_list, next_possible_words_list, actual_n_list = data
batch_size = len(actual_n_list)
input_quest, input_quest_char, _ = self.get_agent_inputs(quest_list)
input_observation, input_observation_char, _ = self.get_agent_inputs(
obs_list)
next_input_observation, next_input_observation_char, _ = self.get_agent_inputs(
next_obs_list)
possible_words, next_possible_words = [], []
for i in range(3):
possible_words.append([item[i] for item in possible_words_list])
next_possible_words.append(
[item[i] for item in next_possible_words_list])
local_word_masks = [
to_pt(item, self.use_cuda, type="float")
for item in self.get_local_word_masks(possible_words)
]
next_local_word_masks = [
to_pt(item, self.use_cuda, type="float")
for item in self.get_local_word_masks(next_possible_words)
]
action_ranks = self.get_ranks(
input_observation,
input_observation_char,
input_quest,
input_quest_char,
local_word_masks,
use_model="online"
) # list of batch x vocab or list of batch x vocab x atoms
# ps_a
word_qvalues = [
ez_gather_dim_1(w_rank, idx.unsqueeze(-1)).squeeze(1)
for w_rank, idx in zip(action_ranks, chosen_indices)
] # list of batch or list of batch x atoms
q_value = torch.mean(torch.stack(word_qvalues, -1),
-1) # batch or batch x atoms
# log_ps_a
log_q_value = torch.log(q_value) # batch or batch x atoms
with torch.no_grad():
if self.noisy_net:
self.target_net.reset_noise() # Sample new target net noise
if self.double_dqn:
# pns Probabilities p(s_t+n, ·; θonline)
next_action_ranks = self.get_ranks(next_input_observation,
next_input_observation_char,
input_quest,
input_quest_char,
next_local_word_masks,
use_model="online")
# list of batch x vocab or list of batch x vocab x atoms
# Perform argmax action selection using online network: argmax_a[(z, p(s_t+n, a; θonline))]
next_word_indices = self.choose_maxQ_command(
next_action_ranks,
next_local_word_masks) # list of batch x 1
# pns # Probabilities p(s_t+n, ·; θtarget)
next_action_ranks = self.get_ranks(
next_input_observation,
next_input_observation_char,
input_quest,
input_quest_char,
next_local_word_masks,
use_model="target"
) # batch x vocab or list of batch x vocab x atoms
# pns_a # Double-Q probabilities p(s_t+n, argmax_a[(z, p(s_t+n, a; θonline))]; θtarget)
next_word_qvalues = [
ez_gather_dim_1(w_rank, idx.unsqueeze(-1)).squeeze(1) for
w_rank, idx in zip(next_action_ranks, next_word_indices)
] # list of batch or list of batch x atoms
else:
# pns Probabilities p(s_t+n, ·; θonline)
next_action_ranks = self.get_ranks(next_input_observation,
next_input_observation_char,
input_quest,
input_quest_char,
next_local_word_masks,
use_model="target")
# list of batch x vocab or list of batch x vocab x atoms
next_word_indices = self.choose_maxQ_command(
next_action_ranks,
next_local_word_masks) # list of batch x 1
next_word_qvalues = [
ez_gather_dim_1(w_rank, idx.unsqueeze(-1)).squeeze(1) for
w_rank, idx in zip(next_action_ranks, next_word_indices)
] # list of batch or list of batch x atoms
next_q_value = torch.mean(torch.stack(next_word_qvalues, -1),
-1) # batch or batch x atoms
# Compute Tz (Bellman operator T applied to z)
discount = to_pt((np.ones_like(actual_n_list) *
self.discount_gamma)**actual_n_list,
self.use_cuda,
type="float")
if not self.use_distributional:
rewards = rewards + next_q_value * discount # batch
loss = F.smooth_l1_loss(q_value, rewards)
return loss
with torch.no_grad():
Tz = rewards.unsqueeze(
-1) + discount.unsqueeze(-1) * self.support.unsqueeze(
0) # Tz = R^n + (γ^n)z (accounting for terminal states)
Tz = Tz.clamp(min=self.v_min,
max=self.v_max) # Clamp between supported values
# Compute L2 projection of Tz onto fixed support z
b = (Tz - self.v_min) / self.delta_z # b = (Tz - Vmin) / Δz
l, u = b.floor().to(torch.int64), b.ceil().to(torch.int64)
# Fix disappearing probability mass when l = b = u (b is int)
l[(u > 0) * (l == u)] -= 1
u[(l < (self.atoms - 1)) * (l == u)] += 1
# Distribute probability of Tz
m = torch.zeros(batch_size, self.atoms).float()
if self.use_cuda:
m = m.cuda()
offset = torch.linspace(0, ((batch_size - 1) * self.atoms),
batch_size).unsqueeze(1).expand(
batch_size, self.atoms).long()
if self.use_cuda:
offset = offset.cuda()
m.view(-1).index_add_(
0, (l + offset).view(-1),
(next_q_value *
(u.float() - b)).view(-1)) # m_l = m_l + p(s_t+n, a*)(u - b)
m.view(-1).index_add_(
0, (u + offset).view(-1),
(next_q_value *
(b - l.float())).view(-1)) # m_u = m_u + p(s_t+n, a*)(b - l)
loss = -torch.sum(
m * log_q_value,
1) # Cross-entropy loss (minimises DKL(m||p(s_t, a_t)))
loss = torch.mean(loss)
return loss
def act(self,
obs,
infos,
input_observation,
input_observation_char,
input_quest,
input_quest_char,
possible_words,
random=False):
"""
Acts upon the current list of observations.
One text command must be returned for each observation.
"""
with torch.no_grad():
if self.mode == "eval":
return self.act_greedy(obs, infos, input_observation,
input_observation_char, input_quest,
input_quest_char, possible_words)
if random:
return self.act_random(obs, infos, input_observation,
input_observation_char, input_quest,
input_quest_char, possible_words)
batch_size = len(obs)
local_word_masks_np = self.get_local_word_masks(possible_words)
local_word_masks = [
to_pt(item, self.use_cuda, type="float")
for item in local_word_masks_np
]
# generate commands for one game step, epsilon greedy is applied, i.e.,
# there is epsilon of chance to generate random commands
action_ranks = self.get_ranks(
input_observation,
input_observation_char,
input_quest,
input_quest_char,
local_word_masks,
use_model="online") # list of batch x vocab
word_indices_maxq = self.choose_maxQ_command(
action_ranks, local_word_masks)
word_indices_random = self.choose_random_command(
batch_size, len(self.word_vocab), possible_words)
# random number for epsilon greedy
rand_num = np.random.uniform(low=0.0,
high=1.0,
size=(batch_size, ))
less_than_epsilon = (rand_num < self.epsilon).astype(
"float32") # batch
greater_than_epsilon = 1.0 - less_than_epsilon
less_than_epsilon = to_pt(less_than_epsilon,
self.use_cuda,
type='long')
greater_than_epsilon = to_pt(greater_than_epsilon,
self.use_cuda,
type='long')
chosen_indices = [
less_than_epsilon * idx_random +
greater_than_epsilon * idx_maxq
for idx_random, idx_maxq in zip(word_indices_random,
word_indices_maxq)
]
chosen_strings = self.get_chosen_strings(chosen_indices)
for i in range(batch_size):
if chosen_strings[i] == "wait":
self.not_finished_yet[i] = 0.0
# info for replay memory
for i in range(batch_size):
if self.prev_actions[-1][i] == "wait":
self.prev_step_is_still_interacting[i] = 0.0
# previous step is still interacting, this is because DQN requires one step extra computation
replay_info = [
chosen_indices,
to_pt(self.prev_step_is_still_interacting, self.use_cuda,
"float")
]
# cache new info in current game step into caches
self.prev_actions.append(chosen_strings)
return chosen_strings, replay_info
def get_dqn_loss(self):
"""
Update neural model in agent. In this example we follow algorithm
of updating model in dqn with replay memory.
"""
if len(self.replay_memory) < self.replay_batch_size:
return None, None
data = self.replay_memory.get_batch(self.replay_batch_size,
self.multi_step)
if data is None:
return None, None
obs_list, quest_list, action_indices, ctrlf_indices, rewards, next_obs_list, actual_ns = data
input_observation, input_observation_char, observation_id_list = self.get_agent_inputs(
obs_list)
input_quest, input_quest_char, quest_id_list = self.get_agent_inputs(
quest_list)
next_input_observation, next_input_observation_char, next_observation_id_list = self.get_agent_inputs(
next_obs_list)
ctrlf_word_mask, _ = self.get_word_mask(quest_id_list,
observation_id_list)
next_ctrlf_word_mask, _ = self.get_word_mask(quest_id_list,
next_observation_id_list)
action_rank, ctrlf_rank = self.get_ranks(
input_observation,
input_observation_char,
input_quest,
input_quest_char,
ctrlf_word_mask,
use_model="online") # batch x vocab
# ps_a
q_value_action = ez_gather_dim_1(action_rank,
action_indices).squeeze(1) # batch
q_value_ctrlf = ez_gather_dim_1(ctrlf_rank,
ctrlf_indices).squeeze(1) # batch
is_ctrlf = torch.eq(action_indices, float(self.action2id["ctrl+f"])
).float() # when the action is ctrl+f, batch
q_value = (q_value_action + q_value_ctrlf * is_ctrlf) / (
is_ctrlf + 1) # masked average
# q_value = torch.mean(torch.stack([q_value_action, q_value_ctrlf], -1), -1)
with torch.no_grad():
if self.noisy_net:
self.target_net.reset_noise() # Sample new target net noise
# pns Probabilities p(s_t+n, ·; θonline)
next_action_rank, next_ctrlf_rank = self.get_ranks(
next_input_observation,
next_input_observation_char,
input_quest,
input_quest_char,
next_ctrlf_word_mask,
use_model="online") # batch x vocab
# Perform argmax action selection using online network: argmax_a[(z, p(s_t+n, a; θonline))]
next_action_indices = self.choose_maxQ_command(
next_action_rank) # batch x 1
next_ctrlf_indices = self.choose_maxQ_command(
next_ctrlf_rank, next_ctrlf_word_mask) # batch x 1
# pns # Probabilities p(s_t+n, ·; θtarget)
next_action_rank, next_ctrlf_rank = self.get_ranks(
next_input_observation,
next_input_observation_char,
input_quest,
input_quest_char,
next_ctrlf_word_mask,
use_model="target") # batch x vocab
# pns_a # Double-Q probabilities p(s_t+n, argmax_a[(z, p(s_t+n, a; θonline))]; θtarget)
next_q_value_action = ez_gather_dim_1(next_action_rank,
next_action_indices).squeeze(
1) # batch
next_q_value_ctrlf = ez_gather_dim_1(next_ctrlf_rank,
next_ctrlf_indices).squeeze(
1) # batch
next_is_ctrlf = torch.eq(next_action_indices,
float(self.action2id["ctrl+f"])).float(
) # when the action is ctrl+f, batch
next_q_value = (next_q_value_action +
next_q_value_ctrlf * next_is_ctrlf) / (
next_is_ctrlf + 1) # masked average
discount = to_pt(
(np.ones_like(actual_ns) * self.discount_gamma)**actual_ns,
self.use_cuda,
type="float")
rewards = rewards + next_q_value * discount # batch
loss = F.smooth_l1_loss(q_value, rewards)
return loss, q_value
def train(data_path):
time_1 = datetime.datetime.now()
agent = Agent()
# visdom
viz = visdom.Visdom()
plt_win = None
eval_plt_win = None
viz_avg_correct_state_acc, viz_avg_qa_acc = [], []
viz_eval_sufficient_info_reward, viz_eval_qa_reward = [], []
step_in_total = 0
running_avg_qa_reward = generic.HistoryScoreCache(capacity=500)
running_avg_sufficient_info_reward = generic.HistoryScoreCache(
capacity=500)
running_avg_qa_loss = generic.HistoryScoreCache(capacity=500)
running_avg_correct_state_loss = generic.HistoryScoreCache(capacity=500)
output_dir, data_dir = ".", "."
json_file_name = agent.experiment_tag.replace(" ", "_")
best_sum_reward_so_far = 0.0
# load model from checkpoint
if agent.load_pretrained:
if os.path.exists(output_dir + "/" + agent.experiment_tag +
"_model.pt"):
agent.load_pretrained_model(output_dir + "/" +
agent.experiment_tag + "_model.pt")
agent.update_target_net()
elif os.path.exists(data_dir + "/" + agent.load_from_tag + ".pt"):
agent.load_pretrained_model(data_dir + "/" + agent.load_from_tag +
".pt")
agent.update_target_net()
else:
print(
"Failed to load pretrained model... couldn't find the checkpoint file..."
)
# Create temporary folder for the generated games.
games_dir = tempfile.TemporaryDirectory(
prefix="tw_games"
) # This is not deleted upon error. It would be better to use a with statement.
games_dir = pjoin(games_dir.name, "") # So path ends with '/'.
# copy grammar files into tmp folder so that it works smoothly
assert os.path.exists(
"./textworld_data"), "Oh no! textworld_data folder is not there..."
os.mkdir(games_dir)
os.mkdir(pjoin(games_dir, "textworld_data"))
copy_tree("textworld_data", games_dir + "textworld_data")
if agent.run_eval:
assert os.path.exists(pjoin(
data_path,
agent.testset_path)), "Oh no! test_set folder is not there..."
os.mkdir(pjoin(games_dir, agent.testset_path))
copy_tree(pjoin(data_path, agent.testset_path),
pjoin(games_dir, agent.testset_path))
if agent.train_data_size == -1:
game_queue_size = agent.batch_size * 5
game_queue = []
episode_no = 0
if agent.train_data_size == -1:
# endless mode
game_generator_queue = game_generator.game_generator_queue(
path=games_dir,
random_map=agent.random_map,
question_type=agent.question_type,
max_q_size=agent.batch_size * 2,
nb_worker=8)
else:
# generate the training set
all_training_games = game_generator.game_generator(
path=games_dir,
random_map=agent.random_map,
question_type=agent.question_type,
train_data_size=agent.train_data_size)
all_training_games.sort()
all_env_ids = None
while (True):
if episode_no > agent.max_episode:
break
np.random.seed(episode_no)
if agent.train_data_size == -1:
# endless mode
for _ in range(agent.batch_size):
if not game_generator_queue.empty():
tmp_game = game_generator_queue.get()
if os.path.exists(tmp_game):
game_queue.append(tmp_game)
if len(game_queue) == 0:
time.sleep(0.1)
continue
can_delete_these = []
if len(game_queue) > game_queue_size:
can_delete_these = game_queue[:-game_queue_size]
game_queue = game_queue[-game_queue_size:]
sampled_games = np.random.choice(game_queue,
agent.batch_size).tolist()
env_ids = [
register_game(gamefile, request_infos=request_infos)
for gamefile in sampled_games
]
else:
if all_env_ids is None:
all_env_ids = [
register_game(gamefile, request_infos=request_infos)
for gamefile in all_training_games
]
env_ids = np.random.choice(all_env_ids, agent.batch_size).tolist()
if len(env_ids
) != agent.batch_size: # either less than or greater than
env_ids = np.random.choice(env_ids, agent.batch_size).tolist()
env_id = make_batch2(env_ids, parallel=True)
env = gym.make(env_id)
env.seed(episode_no)
obs, infos = env.reset()
batch_size = len(obs)
# generate question-answer pairs here
questions, answers, reward_helper_info = game_generator.generate_qa_pairs(
infos, question_type=agent.question_type, seed=episode_no)
print(
"====================================================================================",
episode_no)
print(questions[0], answers[0])
agent.train()
agent.init(obs, infos)
commands, last_facts, init_facts = [], [], []
commands_per_step, game_facts_cache = [], []
for i in range(batch_size):
commands.append("restart")
last_facts.append(None)
init_facts.append(None)
game_facts_cache.append([])
commands_per_step.append(["restart"])
observation_strings, possible_words = agent.get_game_info_at_certain_step(
obs, infos)
observation_strings = [
a + " <|> " + item
for a, item in zip(commands, observation_strings)
]
input_quest, input_quest_char, _ = agent.get_agent_inputs(questions)
transition_cache = []
print_cmds = []
counting_rewards_np = []
valid_command_rewards_np = []
act_randomly = False if agent.noisy_net else episode_no < agent.learn_start_from_this_episode
# push init state into counting reward dict
state_strings = agent.get_state_strings(infos)
_ = agent.get_binarized_count(state_strings, update=True)
for step_no in range(agent.max_nb_steps_per_episode):
# update answerer input
for i in range(batch_size):
if agent.not_finished_yet[i] == 1:
agent.naozi.push_one(i, copy.copy(observation_strings[i]))
if agent.prev_step_is_still_interacting[i] == 1:
new_facts = process_facts(last_facts[i], infos["game"][i],
infos["facts"][i],
infos["last_action"][i],
commands[i])
game_facts_cache[i].append(
new_facts
) # info used in reward computing of existence question
last_facts[i] = new_facts
if step_no == 0:
init_facts[i] = copy.copy(new_facts)
# generate commands
if agent.noisy_net:
agent.reset_noise() # Draw a new set of noisy weights
observation_strings_w_history = agent.naozi.get()
input_observation, input_observation_char, _ = agent.get_agent_inputs(
observation_strings_w_history)
commands, replay_info = agent.act(obs,
infos,
input_observation,
input_observation_char,
input_quest,
input_quest_char,
possible_words,
random=act_randomly)
for i in range(batch_size):
commands_per_step[i].append(commands[i])
replay_info = [
observation_strings_w_history, questions, possible_words
] + replay_info
admissible_commands = [
set(item) - set(["look", "wait", "inventory"])
for item in infos["admissible_commands"]
]
vc_rewards = [
float(c in ac) for c, ac in zip(commands, admissible_commands)
]
valid_command_rewards_np.append(np.array(vc_rewards))
# pass commands into env
obs, _, _, infos = env.step(commands)
# possible words no not depend on history, because one can only interact with what is currently accessible
observation_strings, possible_words = agent.get_game_info_at_certain_step(
obs, infos)
observation_strings = [
a + " <|> " + item
for a, item in zip(commands, observation_strings)
]
# counting rewards
state_strings = agent.get_state_strings(infos)
c_rewards = agent.get_binarized_count(state_strings, update=True)
counting_rewards_np.append(np.array(c_rewards))
if agent.noisy_net and step_in_total % agent.update_per_k_game_steps == 0:
agent.reset_noise() # Draw a new set of noisy weights
if episode_no >= agent.learn_start_from_this_episode and step_in_total % agent.update_per_k_game_steps == 0:
interaction_loss = agent.update_interaction()
if interaction_loss is not None:
running_avg_correct_state_loss.push(interaction_loss)
qa_loss = agent.update_qa()
if qa_loss is not None:
running_avg_qa_loss.push(qa_loss)
print_cmds.append(commands[0] if agent.
prev_step_is_still_interacting[0] else "--")
# force stopping
if step_no == agent.max_nb_steps_per_episode - 1:
replay_info[-1] = torch.zeros_like(replay_info[-1])
transition_cache.append(replay_info)
step_in_total += 1
if (step_no == agent.max_nb_steps_per_episode -
1) or (step_no > 0
and np.sum(generic.to_np(replay_info[-1])) == 0):
break
print(" / ".join(print_cmds))
# The agent has exhausted all steps, now answer question.
answerer_input = agent.naozi.get()
answerer_input_observation, answerer_input_observation_char, answerer_observation_ids = agent.get_agent_inputs(
answerer_input)
chosen_word_indices = agent.answer_question_act_greedy(
answerer_input_observation, answerer_input_observation_char,
answerer_observation_ids, input_quest, input_quest_char) # batch
chosen_word_indices_np = generic.to_np(chosen_word_indices)
chosen_answers = [
agent.word_vocab[item] for item in chosen_word_indices_np
]
# rewards
# qa reward
qa_reward_np = reward_helper.get_qa_reward(answers, chosen_answers)
# sufficient info rewards
masks = [item[-1] for item in transition_cache]
masks_np = [generic.to_np(item) for item in masks]
# 1 1 0 0 0 --> 1 1 0 0 0 0
game_finishing_mask = np.stack(masks_np + [np.zeros((batch_size, ))],
0) # game step+1 x batch size
# 1 1 0 0 0 0 --> 0 1 0 0 0
game_finishing_mask = game_finishing_mask[:-1, :] - game_finishing_mask[
1:, :] # game step x batch size
game_running_mask = np.stack(masks_np, 0) # game step x batch size
if agent.question_type == "location":
# sufficient info reward: location question
reward_helper_info["observation_before_finish"] = answerer_input
reward_helper_info["game_finishing_mask"] = game_finishing_mask
sufficient_info_reward_np = reward_helper.get_sufficient_info_reward_location(
reward_helper_info)
elif agent.question_type == "existence":
# sufficient info reward: existence question
reward_helper_info["observation_before_finish"] = answerer_input
reward_helper_info[
"game_facts_per_step"] = game_facts_cache # facts before issuing command (we want to stop at correct state)
reward_helper_info["init_game_facts"] = init_facts
reward_helper_info["full_facts"] = infos["facts"]
reward_helper_info["answers"] = answers
reward_helper_info["game_finishing_mask"] = game_finishing_mask
sufficient_info_reward_np = reward_helper.get_sufficient_info_reward_existence(
reward_helper_info)
elif agent.question_type == "attribute":
# sufficient info reward: attribute question
reward_helper_info["answers"] = answers
reward_helper_info[
"game_facts_per_step"] = game_facts_cache # facts before and after issuing commands (we want to compare the differnce)
reward_helper_info["init_game_facts"] = init_facts
reward_helper_info["full_facts"] = infos["facts"]
reward_helper_info[
"commands_per_step"] = commands_per_step # commands before and after issuing commands (we want to compare the differnce)
reward_helper_info["game_finishing_mask"] = game_finishing_mask
sufficient_info_reward_np = reward_helper.get_sufficient_info_reward_attribute(
reward_helper_info)
else:
raise NotImplementedError
# push qa experience into qa replay buffer
for b in range(batch_size): # data points in batch
# if the agent is not in the correct state, do not push it into replay buffer
if np.sum(sufficient_info_reward_np[b]) == 0.0:
continue
agent.qa_replay_memory.push(False, qa_reward_np[b],
answerer_input[b], questions[b],
answers[b])
# assign sufficient info reward and counting reward to the corresponding steps
counting_rewards_np = np.stack(counting_rewards_np,
1) # batch x game step
valid_command_rewards_np = np.stack(valid_command_rewards_np,
1) # batch x game step
command_rewards_np = sufficient_info_reward_np + counting_rewards_np * game_running_mask.T * agent.revisit_counting_lambda + valid_command_rewards_np * game_running_mask.T * agent.valid_command_bonus_lambda # batch x game step
command_rewards = generic.to_pt(command_rewards_np,
enable_cuda=agent.use_cuda,
type="float") # batch x game step
for i in range(command_rewards_np.shape[1]):
transition_cache[i].append(command_rewards[:, i])
print(command_rewards_np[0])
# push command generation experience into replay buffer
for b in range(batch_size):
is_prior = np.sum(command_rewards_np[b], 0) > 0.0
for i in range(len(transition_cache)):
batch_observation_strings, batch_question_strings, batch_possible_words, batch_chosen_indices, _, batch_rewards = transition_cache[
i]
is_final = True
if masks_np[i][b] != 0:
is_final = False
agent.command_generation_replay_memory.push(
is_prior, batch_observation_strings[b],
batch_question_strings[b],
[item[b] for item in batch_possible_words],
[item[b] for item in batch_chosen_indices],
batch_rewards[b], is_final)
if masks_np[i][b] == 0.0:
break
# for printing
r_qa = np.mean(qa_reward_np)
r_sufficient_info = np.mean(np.sum(sufficient_info_reward_np, -1))
running_avg_qa_reward.push(r_qa)
running_avg_sufficient_info_reward.push(r_sufficient_info)
print_rewards = np.mean(np.sum(command_rewards_np, -1))
obs_string = answerer_input[0]
print(obs_string)
# finish game
agent.finish_of_episode(episode_no, batch_size)
# close env
env.close()
if agent.train_data_size == -1:
# when games are generated on the fly,
# remove all files (including .json and .ni) that have been used
files_to_delete = []
for gamefile in can_delete_these:
if not gamefile.endswith(".ulx"):
continue
files_to_delete.append(gamefile)
files_to_delete.append(gamefile.replace(".ulx", ".json"))
files_to_delete.append(gamefile.replace(".ulx", ".ni"))
# print("rm -f {}".format(" ".join(files_to_delete)))
os.system("rm -f {}".format(" ".join(files_to_delete)))
episode_no += batch_size
time_2 = datetime.datetime.now()
print(
"Episode: {:3d} | time spent: {:s} | interaction loss: {:2.3f} | qa loss: {:2.3f} | rewards: {:2.3f} | qa acc: {:2.3f}/{:2.3f} | correct state: {:2.3f}/{:2.3f}"
.format(episode_no,
str(time_2 - time_1).rsplit(".")[0],
running_avg_correct_state_loss.get_avg(),
running_avg_qa_loss.get_avg(), print_rewards, r_qa,
running_avg_qa_reward.get_avg(), r_sufficient_info,
running_avg_sufficient_info_reward.get_avg()))
if episode_no < agent.learn_start_from_this_episode:
continue
if episode_no == 0 or (
episode_no % agent.save_frequency >
(episode_no - batch_size) % agent.save_frequency):
continue
eval_qa_reward, eval_sufficient_info_reward = 0.0, 0.0
# evaluate
if agent.run_eval:
eval_qa_reward, eval_sufficient_info_reward = evaluate.evaluate(
data_dir, agent)
# if run eval, then save model by eval accucacy
if eval_qa_reward + eval_sufficient_info_reward > best_sum_reward_so_far:
best_sum_reward_so_far = eval_qa_reward + eval_sufficient_info_reward
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag + "_model.pt")
# save model
elif agent.save_checkpoint:
if running_avg_qa_reward.get_avg(
) + running_avg_sufficient_info_reward.get_avg(
) > best_sum_reward_so_far:
best_sum_reward_so_far = running_avg_qa_reward.get_avg(
) + running_avg_sufficient_info_reward.get_avg()
agent.save_model_to_path(output_dir + "/" +
agent.experiment_tag + "_model.pt")
# plot using visdom
viz_avg_correct_state_acc.append(
running_avg_sufficient_info_reward.get_avg())
viz_avg_qa_acc.append(running_avg_qa_reward.get_avg())
viz_eval_sufficient_info_reward.append(eval_sufficient_info_reward)
viz_eval_qa_reward.append(eval_qa_reward)
viz_x = np.arange(len(viz_avg_correct_state_acc)).tolist()
if plt_win is None:
plt_win = viz.line(X=viz_x,
Y=viz_avg_correct_state_acc,
opts=dict(title=agent.experiment_tag +
"_train"),
name="correct state")
viz.line(X=viz_x,
Y=viz_avg_qa_acc,
opts=dict(title=agent.experiment_tag + "_train"),
win=plt_win,
update='append',
name="qa")
else:
viz.line(X=[len(viz_avg_correct_state_acc) - 1],
Y=[viz_avg_correct_state_acc[-1]],
opts=dict(title=agent.experiment_tag + "_train"),
win=plt_win,
update='append',
name="correct state")
viz.line(X=[len(viz_avg_qa_acc) - 1],
Y=[viz_avg_qa_acc[-1]],
opts=dict(title=agent.experiment_tag + "_train"),
win=plt_win,
update='append',
name="qa")
if eval_plt_win is None:
eval_plt_win = viz.line(X=viz_x,
Y=viz_eval_sufficient_info_reward,
opts=dict(title=agent.experiment_tag +
"_eval"),
name="correct state")
viz.line(X=viz_x,
Y=viz_eval_qa_reward,
opts=dict(title=agent.experiment_tag + "_eval"),
win=eval_plt_win,
update='append',
name="qa")
else:
viz.line(X=[len(viz_eval_sufficient_info_reward) - 1],
Y=[viz_eval_sufficient_info_reward[-1]],
opts=dict(title=agent.experiment_tag + "_eval"),
win=eval_plt_win,
update='append',
name="correct state")
viz.line(X=[len(viz_eval_qa_reward) - 1],
Y=[viz_eval_qa_reward[-1]],
opts=dict(title=agent.experiment_tag + "_eval"),
win=eval_plt_win,
update='append',
name="qa")
# write accucacies down into file
_s = json.dumps({
"time spent":
str(time_2 - time_1).rsplit(".")[0],
"sufficient info":
running_avg_sufficient_info_reward.get_avg(),
"qa":
running_avg_qa_reward.get_avg(),
"eval sufficient info":
eval_sufficient_info_reward,
"eval qa":
eval_qa_reward
})
with open(output_dir + "/" + json_file_name + '.json',
'a+') as outfile:
outfile.write(_s + '\n')
outfile.flush()
