forked from weipu-zhang/STORM
-
Notifications
You must be signed in to change notification settings - Fork 0
/
replay_buffer.py
275 lines (259 loc) · 10.1 KB
/
replay_buffer.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
import pickle
import numpy as np
import torch
from einops import rearrange
class ReplayBuffer:
def __init__(
self,
obs_shape,
num_envs,
max_length=int(1e6),
warmup_length=50000,
store_on_gpu=False,
) -> None:
self.store_on_gpu = store_on_gpu
if store_on_gpu:
self.obs_buffer = torch.empty(
(max_length // num_envs, num_envs, *obs_shape),
dtype=torch.uint8,
device="cuda",
requires_grad=False,
)
self.action_buffer = torch.empty(
(max_length // num_envs, num_envs),
dtype=torch.float32,
device="cuda",
requires_grad=False,
)
self.reward_buffer = torch.empty(
(max_length // num_envs, num_envs),
dtype=torch.float32,
device="cuda",
requires_grad=False,
)
self.termination_buffer = torch.empty(
(max_length // num_envs, num_envs),
dtype=torch.float32,
device="cuda",
requires_grad=False,
)
else:
self.obs_buffer = np.empty(
(max_length // num_envs, num_envs, *obs_shape), dtype=np.uint8
)
self.action_buffer = np.empty(
(max_length // num_envs, num_envs), dtype=np.float32
)
self.reward_buffer = np.empty(
(max_length // num_envs, num_envs), dtype=np.float32
)
self.termination_buffer = np.empty(
(max_length // num_envs, num_envs), dtype=np.float32
)
self.length = 0
self.num_envs = num_envs
self.last_pointer = -1
self.max_length = max_length
self.warmup_length = warmup_length
self.external_buffer_length = None
def load_trajectory(self, path):
buffer = pickle.load(open(path, "rb"))
if self.store_on_gpu:
self.external_buffer = {
name: torch.from_numpy(buffer[name]).to("cuda") for name in buffer
}
else:
self.external_buffer = buffer
self.external_buffer_length = self.external_buffer["obs"].shape[0]
def sample_external(self, batch_size, batch_length, to_device="cuda"):
indexes = np.random.randint(
0, self.external_buffer_length + 1 - batch_length, size=batch_size
)
if self.store_on_gpu:
obs = torch.stack(
[
self.external_buffer["obs"][idx : idx + batch_length]
for idx in indexes
]
)
action = torch.stack(
[
self.external_buffer["action"][idx : idx + batch_length]
for idx in indexes
]
)
reward = torch.stack(
[
self.external_buffer["reward"][idx : idx + batch_length]
for idx in indexes
]
)
termination = torch.stack(
[
self.external_buffer["done"][idx : idx + batch_length]
for idx in indexes
]
)
else:
obs = np.stack(
[
self.external_buffer["obs"][idx : idx + batch_length]
for idx in indexes
]
)
action = np.stack(
[
self.external_buffer["action"][idx : idx + batch_length]
for idx in indexes
]
)
reward = np.stack(
[
self.external_buffer["reward"][idx : idx + batch_length]
for idx in indexes
]
)
termination = np.stack(
[
self.external_buffer["done"][idx : idx + batch_length]
for idx in indexes
]
)
return obs, action, reward, termination
def ready(self):
return self.length * self.num_envs > self.warmup_length
@torch.no_grad()
def sample(self, batch_size, external_batch_size, batch_length, to_device="cuda"):
if self.store_on_gpu:
obs, action, reward, termination = [], [], [], []
if batch_size > 0:
for i in range(self.num_envs):
indexes = np.random.randint(
0,
self.length + 1 - batch_length,
size=batch_size // self.num_envs,
)
obs.append(
torch.stack(
[
self.obs_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
action.append(
torch.stack(
[
self.action_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
reward.append(
torch.stack(
[
self.reward_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
termination.append(
torch.stack(
[
self.termination_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
if self.external_buffer_length is not None and external_batch_size > 0:
(
external_obs,
external_action,
external_reward,
external_termination,
) = self.sample_external(external_batch_size, batch_length, to_device)
obs.append(external_obs)
action.append(external_action)
reward.append(external_reward)
termination.append(external_termination)
obs = torch.cat(obs, dim=0).float() / 255
obs = rearrange(obs, "B T H W C -> B T C H W")
action = torch.cat(action, dim=0)
reward = torch.cat(reward, dim=0)
termination = torch.cat(termination, dim=0)
else:
obs, action, reward, termination = [], [], [], []
if batch_size > 0:
for i in range(self.num_envs):
indexes = np.random.randint(
0,
self.length + 1 - batch_length,
size=batch_size // self.num_envs,
)
obs.append(
np.stack(
[
self.obs_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
action.append(
np.stack(
[
self.action_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
reward.append(
np.stack(
[
self.reward_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
termination.append(
np.stack(
[
self.termination_buffer[idx : idx + batch_length, i]
for idx in indexes
]
)
)
if self.external_buffer_length is not None and external_batch_size > 0:
(
external_obs,
external_action,
external_reward,
external_termination,
) = self.sample_external(external_batch_size, batch_length, to_device)
obs.append(external_obs)
action.append(external_action)
reward.append(external_reward)
termination.append(external_termination)
obs = torch.from_numpy(np.concatenate(obs, axis=0)).float().cuda() / 255
obs = rearrange(obs, "B T H W C -> B T C H W")
action = torch.from_numpy(np.concatenate(action, axis=0)).cuda()
reward = torch.from_numpy(np.concatenate(reward, axis=0)).cuda()
termination = torch.from_numpy(np.concatenate(termination, axis=0)).cuda()
return obs, action, reward, termination
def append(self, obs, action, reward, termination):
# obs/nex_obs: torch Tensor
# action/reward/termination: int or float or bool
self.last_pointer = (self.last_pointer + 1) % (self.max_length // self.num_envs)
if self.store_on_gpu:
self.obs_buffer[self.last_pointer] = torch.from_numpy(obs)
self.action_buffer[self.last_pointer] = torch.from_numpy(action)
self.reward_buffer[self.last_pointer] = torch.from_numpy(reward)
self.termination_buffer[self.last_pointer] = torch.from_numpy(termination)
else:
self.obs_buffer[self.last_pointer] = obs
self.action_buffer[self.last_pointer] = action
self.reward_buffer[self.last_pointer] = reward
self.termination_buffer[self.last_pointer] = termination
if len(self) < self.max_length:
self.length += 1
def __len__(self):
return self.length * self.num_envs