maybe finished collector?

.github/workflows/pytest.yml

@@ -33,7 +33,7 @@ jobs:
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        flake8 . --count --exit-zero --max-complexity=20 --max-line-length=79 --statistics
     - name: Test with pytest
       run: |
         pip install pytest pytest-cov

flake8.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
 flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics                 
-flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+flake8 . --count --exit-zero --max-complexity=20 --max-line-length=79 --statistics

setup.py

@@ -42,7 +42,7 @@ setup(
         'tqdm',
         'numpy',
         'torch',
-        'cloudpickle'
+        'cloudpickle',
         'tensorboard',
     ],
 )

test/test_batch.py

@@ -0,0 +1,16 @@
+import numpy as np
+
+from tianshou.data import Batch
+
+
+def test_batch():
+    batch = Batch(obs=[0], np=np.zeros([3, 4]))
+    batch.update(obs=[1])
+    assert batch.obs == [1]
+    batch.append(batch)
+    assert batch.obs == [1, 1]
+    assert batch.np.shape == (6, 4)
+
+
+if __name__ == '__main__':
+    test_batch()

test/test_buffer.py

@@ -14,8 +14,7 @@ def test_replaybuffer(size=10, bufsize=20):
         obs_next, rew, done, info = env.step(a)
         buf.add(obs, a, rew, done, obs_next, info)
         assert len(buf) == min(bufsize, i + 1), print(len(buf), i)
-    indice = buf.sample_indice(4)
-    data = buf.sample(4)
+    data, indice = buf.sample(4)
     assert (indice < len(buf)).all()
     assert (data.obs < size).all()
     assert (0 <= data.done).all() and (data.done <= 1).all()

test/test_env.py

@@ -79,7 +79,9 @@ def test_vecenv(verbose=False, size=10, num=8, sleep=0.001):
             for a in action_list:
                 e.step([a] * num)
             t[i] = time.time() - t[i]
-        print(f'VectorEnv: {t[0]:.6f}s\nSubprocVectorEnv: {t[1]:.6f}s\nRayVectorEnv: {t[2]:.6f}s')
+        print(f'VectorEnv: {t[0]:.6f}s')
+        print(f'SubprocVectorEnv: {t[1]:.6f}s')
+        print(f'RayVectorEnv: {t[2]:.6f}s')
     for v in venv:
         v.close()
 

tianshou/__init__.py

@@ -1,4 +1,9 @@
-from tianshou import data, env, utils
+from tianshou import data, env, utils, policy
 
 __version__ = '0.2.0'
-__all__ = ['data', 'env', 'utils']
+__all__ = [
+    'data',
+    'env',
+    'utils',
+    'policy'
+]

tianshou/data/__init__.py

@@ -2,4 +2,9 @@ from tianshou.data.batch import Batch
 from tianshou.data.buffer import ReplayBuffer, PrioritizedReplayBuffer
 from tianshou.data.collector import Collector
 
-__all__ = ['Batch', 'ReplayBuffer', 'PrioritizedReplayBuffer', 'Collector']
+__all__ = [
+    'Batch',
+    'ReplayBuffer',
+    'PrioritizedReplayBuffer',
+    'Collector'
+]

tianshou/data/batch.py

@@ -1,9 +1,29 @@
+import numpy as np
+
+
 class Batch(object):
     """Suggested keys: [obs, act, rew, done, obs_next, info]"""
+
     def __init__(self, **kwargs):
         super().__init__()
-        self.obs_next = None
         self.__dict__.update(kwargs)
 
     def update(self, **kwargs):
         self.__dict__.update(kwargs)
+
+    def append(self, batch):
+        assert isinstance(batch, Batch), 'Only append Batch is allowed!'
+        for k in batch.__dict__.keys():
+            if batch.__dict__[k] is None:
+                continue
+            if not hasattr(self, k) or self.__dict__[k] is None:
+                self.__dict__[k] = batch.__dict__[k]
+            elif isinstance(batch.__dict__[k], np.ndarray):
+                self.__dict__[k] = np.concatenate([
+                    self.__dict__[k], batch.__dict__[k]])
+            elif isinstance(batch.__dict__[k], list):
+                self.__dict__[k] += batch.__dict__[k]
+            else:
+                raise TypeError(
+                    'No support append method with {} in class Batch.'
+                    .format(type(batch.__dict__[k])))

tianshou/data/buffer.py

@@ -4,6 +4,7 @@ from tianshou.data.batch import Batch
 
 class ReplayBuffer(object):
     """docstring for ReplayBuffer"""
+
     def __init__(self, size):
         super().__init__()
         self._maxsize = size
@@ -19,7 +20,8 @@ class ReplayBuffer(object):
             if isinstance(inst, np.ndarray):
                 self.__dict__[name] = np.zeros([self._maxsize, *inst.shape])
             elif isinstance(inst, dict):
-                self.__dict__[name] = np.array([{} for _ in range(self._maxsize)])
+                self.__dict__[name] = np.array(
+                    [{} for _ in range(self._maxsize)])
             else:  # assume `inst` is a number
                 self.__dict__[name] = np.zeros([self._maxsize])
         self.__dict__[name][self._index] = inst
@@ -28,7 +30,8 @@ class ReplayBuffer(object):
         '''
         weight: importance weights, disabled here
         '''
-        assert isinstance(info, dict), 'You should return a dict in the last argument of env.step function.'
+        assert isinstance(info, dict),\
+            'You should return a dict in the last argument of env.step().'
         self._add_to_buffer('obs', obs)
         self._add_to_buffer('act', act)
         self._add_to_buffer('rew', rew)
@@ -42,18 +45,11 @@ class ReplayBuffer(object):
         self._index = self._size = 0
         self.indice = []
 
-    def sample_indice(self, batch_size):
+    def sample(self, batch_size):
         if batch_size > 0:
-            self.indice = np.random.choice(self._size, batch_size)
+            indice = np.random.choice(self._size, batch_size)
         else:
-            self.indice = np.arange(self._size)
-        return self.indice
-
-    def sample(self, batch_size, indice=None):
-        if indice is None:
-            indice = self.sample_indice(batch_size)
-        else:
-            self.indice = indice
+            indice = np.arange(self._size)
         return Batch(
             obs=self.obs[indice],
             act=self.act[indice],
@@ -61,11 +57,12 @@ class ReplayBuffer(object):
             done=self.done[indice],
             obs_next=self.obs_next[indice],
             info=self.info[indice]
-        )
+        ), indice
 
 
 class PrioritizedReplayBuffer(ReplayBuffer):
     """docstring for PrioritizedReplayBuffer"""
+
     def __init__(self, size):
         super().__init__(size)
 

tianshou/data/collector.py

@@ -5,8 +5,10 @@ from tianshou.env import BaseVectorEnv
 from tianshou.data import Batch, ReplayBuffer
 from tianshou.utils import MovAvg
 
+
 class Collector(object):
     """docstring for Collector"""
+
     def __init__(self, policy, env, buffer):
         super().__init__()
         self.env = env
@@ -18,15 +20,18 @@ class Collector(object):
         if self.multi_env:
             self.env_num = len(env)
             if isinstance(self.buffer, list):
-                assert len(self.buffer) == self.env_num, 'The data buffer number does not match the input env number.'
+                assert len(self.buffer) == self.env_num,\
+                    'Data buffer number does not match the input env number.'
             elif isinstance(self.buffer, ReplayBuffer):
                 self.buffer = [deepcopy(buffer) for _ in range(self.env_num)]
             else:
                 raise TypeError('The buffer in data collector is invalid!')
         self.reset_env()
         self.clear_buffer()
-        # state over batch is either a list, an np.ndarray, or torch.Tensor (hasattr 'shape')
+        # state over batch is either a list, an np.ndarray, or torch.Tensor
         self.state = None
+        self.stat_reward = MovAvg()
+        self.stat_length = MovAvg()
 
     def clear_buffer(self):
         if self.multi_env:
@@ -38,39 +43,64 @@ class Collector(object):
     def reset_env(self):
         self._obs = self.env.reset()
         self._act = self._rew = self._done = self._info = None
+        if self.multi_env:
+            self.reward = np.zeros(self.env_num)
+            self.length = np.zeros(self.env_num)
+        else:
+            self.reward, self.length = 0, 0
 
-    def collect(self, n_step=0, n_episode=0, tqdm_hook=None):
-        assert sum([(n_step > 0), (n_episode > 0)]) == 1, "One and only one collection number specification permitted!"
+    def collect(self, n_step=0, n_episode=0):
+        assert sum([(n_step > 0), (n_episode > 0)]) == 1,\
+            "One and only one collection number specification permitted!"
         cur_step = 0
         cur_episode = np.zeros(self.env_num) if self.multi_env else 0
         while True:
             if self.multi_env:
-                batch_data = Batch(obs=self._obs, act=self._act, rew=self._rew, done=self._done, info=self._info)
+                batch_data = Batch(
+                    obs=self._obs, act=self._act, rew=self._rew,
+                    done=self._done, obs_next=None, info=self._info)
             else:
-                batch_data = Batch(obs=[self._obs], act=[self._act], rew=[self._rew], done=[self._done], info=[self_info])
+                batch_data = Batch(
+                    obs=[self._obs], act=[self._act], rew=[self._rew],
+                    done=[self._done], obs_next=None, info=[self._info])
             result = self.policy.act(batch_data, self.state)
             self.state = result.state
             self._act = result.act
-            obs_next, self._rew, self._done, self._info = self.env.step(self._act)
+            obs_next, self._rew, self._done, self._info = self.env.step(
+                self._act)
             cur_step += 1
+            self.length += 1
+            self.reward += self._rew
             if self.multi_env:
                 for i in range(self.env_num):
-                    if n_episode > 0 and cur_episode[i] < n_episode or n_episode == 0:
-                        self.buffer[i].add(self._obs[i], self._act[i], self._rew[i], self._done[i], obs_next[i], self._info[i])
+                    if n_episode > 0 and \
+                            cur_episode[i] < n_episode or n_episode == 0:
+                        self.buffer[i].add(
+                            self._obs[i], self._act[i], self._rew[i],
+                            self._done[i], obs_next[i], self._info[i])
                         if self._done[i]:
                             cur_episode[i] += 1
+                            self.stat_reward.add(self.reward[i])
+                            self.stat_length.add(self.length[i])
+                            self.reward[i], self.length[i] = 0, 0
                             if isinstance(self.state, list):
                                 self.state[i] = None
                             else:
                                 self.state[i] = self.state[i] * 0
-                                if hasattr(self.state, 'detach'):  # remove count in torch
+                                if hasattr(self.state, 'detach'):
+                                    # remove ref in torch
                                     self.state = self.state.detach()
                 if n_episode > 0 and (cur_episode >= n_episode).all():
                     break
             else:
-                self.buffer.add(self._obs, self._act[0], self._rew, self._done, obs_next, self._info)
+                self.buffer.add(
+                    self._obs, self._act[0], self._rew,
+                    self._done, obs_next, self._info)
                 if self._done:
                     cur_episode += 1
+                    self.stat_reward.add(self.reward)
+                    self.stat_length.add(self.length)
+                    self.reward, self.length = 0, 0
                     self.state = None
                 if n_episode > 0 and cur_episode >= n_episode:
                     break
@@ -79,8 +109,29 @@ class Collector(object):
             self._obs = obs_next
         self._obs = obs_next
 
-    def sample(self):
-        pass
+    def sample(self, batch_size):
+        if self.multi_env:
+            if batch_size > 0:
+                lens = [len(b) for b in self.buffer]
+                total = sum(lens)
+                ib = np.random.choice(
+                    total, batch_size, p=np.array(lens) / total)
+            else:
+                ib = np.array([])
+            batch_data = Batch()
+            for i, b in enumerate(self.buffer):
+                cur_batch = (ib == i).sum()
+                if batch_size and cur_batch or batch_size <= 0:
+                    batch, indice = b.sample(cur_batch)
+                    batch = self.process_fn(batch, b, indice)
+                    batch_data.append(batch)
+        else:
+            batch_data, indice = self.buffer.sample(batch_size)
+            batch_data = self.process_fn(batch_data, self.buffer, indice)
+        return batch_data
 
     def stat(self):
-        pass
+        return {
+            'reward': self.stat_reward.get(),
+            'length': self.stat_length.get(),
+        }

tianshou/env/__init__.py

@@ -1,3 +1,11 @@
-from tianshou.env.wrapper import FrameStack, BaseVectorEnv, VectorEnv, SubprocVectorEnv, RayVectorEnv
+from tianshou.env.wrapper import FrameStack,\
+    BaseVectorEnv, VectorEnv, SubprocVectorEnv,\
+    RayVectorEnv
 
-__all__ = ['FrameStack', 'BaseVectorEnv', 'VectorEnv', 'SubprocVectorEnv', 'RayVectorEnv']
+__all__ = [
+    'FrameStack',
+    'BaseVectorEnv',
+    'VectorEnv',
+    'SubprocVectorEnv',
+    'RayVectorEnv'
+]

tianshou/env/wrapper.py

@@ -1,6 +1,6 @@
 import numpy as np
+from abc import ABC
 from collections import deque
-from abc import ABC, abstractmethod
 from multiprocessing import Process, Pipe
 try:
     import ray
@@ -64,6 +64,7 @@ class BaseVectorEnv(ABC):
 
 class VectorEnv(BaseVectorEnv):
     """docstring for VectorEnv"""
+
     def __init__(self, env_fns, reset_after_done=False):
         super().__init__()
         self.envs = [_() for _ in env_fns]
@@ -129,14 +130,19 @@ def worker(parent, p, env_fn_wrapper, reset_after_done):
 
 class SubprocVectorEnv(BaseVectorEnv):
     """docstring for SubProcVectorEnv"""
+
     def __init__(self, env_fns, reset_after_done=False):
         super().__init__()
         self.env_num = len(env_fns)
         self.closed = False
-        self.parent_remote, self.child_remote = zip(*[Pipe() for _ in range(self.env_num)])
+        self.parent_remote, self.child_remote = \
+            zip(*[Pipe() for _ in range(self.env_num)])
         self.processes = [
-            Process(target=worker, args=(parent, child, CloudpickleWrapper(env_fn), reset_after_done), daemon=True)
-            for (parent, child, env_fn) in zip(self.parent_remote, self.child_remote, env_fns)
+            Process(target=worker, args=(
+                    parent, child,
+                    CloudpickleWrapper(env_fn), reset_after_done), daemon=True)
+            for (parent, child, env_fn) in zip(
+                self.parent_remote, self.child_remote, env_fns)
         ]
         for p in self.processes:
             p.start()
@@ -185,6 +191,7 @@ class SubprocVectorEnv(BaseVectorEnv):
 
 class RayVectorEnv(BaseVectorEnv):
     """docstring for RayVectorEnv"""
+
     def __init__(self, env_fns, reset_after_done=False):
         super().__init__()
         self.env_num = len(env_fns)
@@ -193,8 +200,11 @@ class RayVectorEnv(BaseVectorEnv):
             if not ray.is_initialized():
                 ray.init()
         except NameError:
-            raise ImportError('Please install ray to support VectorEnv: pip3 install ray -U')
-        self.envs = [ray.remote(EnvWrapper).options(num_cpus=0).remote(e()) for e in env_fns]
+            raise ImportError(
+                'Please install ray to support VectorEnv: pip3 install ray -U')
+        self.envs = [
+            ray.remote(EnvWrapper).options(num_cpus=0).remote(e())
+            for e in env_fns]
 
     def __len__(self):
         return self.env_num

tianshou/policy/__init__.py

@@ -1,3 +1,5 @@
-from tianshou.policy import BasePolicy
+from tianshou.policy.base import BasePolicy
 
-__all__ = ['BasePolicy']
+__all__ = [
+    'BasePolicy'
+]

tianshou/policy/base.py

@@ -3,6 +3,7 @@ from abc import ABC, abstractmethod
 
 class BasePolicy(ABC):
     """docstring for BasePolicy"""
+
     def __init__(self):
         super().__init__()
 
@@ -21,8 +22,8 @@ class BasePolicy(ABC):
         pass
 
     @staticmethod
-    def process_fn(batch, buffer, index):
-        pass
+    def process_fn(batch, buffer, indice):
+        return batch
 
     def exploration(self):
         pass