def __init__(self, sess, ob_space, ac_space, nbatch, nsteps, reuse=False): #pylint: disable=W0613
self.pdtype = make_pdtype(ac_space)
with tf.variable_scope("model", reuse=reuse):
X, processed_x = observation_input(ob_space, nbatch)
activ = tf.tanh
processed_x = tf.layers.flatten(processed_x)
pi_h1 = activ(
fc(processed_x, 'pi_fc1', nh=64, init_scale=np.sqrt(2)))
pi_h2 = activ(fc(pi_h1, 'pi_fc2', nh=64, init_scale=np.sqrt(2)))
vf_h1 = activ(
fc(processed_x, 'vf_fc1', nh=64, init_scale=np.sqrt(2)))
vf_h2 = activ(fc(vf_h1, 'vf_fc2', nh=64, init_scale=np.sqrt(2)))
vf = fc(vf_h2, 'vf', 1)[:, 0]
self.pd, self.pi = self.pdtype.pdfromlatent(pi_h2, init_scale=0.01)
a0 = self.pd.sample()
neglogp0 = self.pd.neglogp(a0)
self.initial_state = None
def step(ob, *_args, **_kwargs):
a, v, neglogp = sess.run([a0, vf, neglogp0], {X: ob})
return a, v, self.initial_state, neglogp
def value(ob, *_args, **_kwargs):
return sess.run(vf, {X: ob})
self.X = X
self.vf = vf
self.step = step
self.value = value
def nature_cnn(unscaled_images, **conv_kwargs):
"""
CNN from Nature paper.
"""
scaled_images = tf.cast(unscaled_images, tf.float32) / 255.
activ = tf.nn.relu
h = activ(
conv(scaled_images,
'c1',
nf=32,
rf=8,
stride=4,
init_scale=np.sqrt(2),
**conv_kwargs))
h2 = activ(
conv(h,
'c2',
nf=64,
rf=4,
stride=2,
init_scale=np.sqrt(2),
**conv_kwargs))
h3 = activ(
conv(h2,
'c3',
nf=64,
rf=3,
stride=1,
init_scale=np.sqrt(2),
**conv_kwargs))
h3 = conv_to_fc(h3)
return activ(fc(h3, 'fc1', nh=512, init_scale=np.sqrt(2)))
def __init__(self,
sess,
ob_space,
ac_space,
nbatch,
nsteps,
nlstm=256,
reuse=False):
nenv = nbatch // nsteps
self.pdtype = make_pdtype(ac_space)
X, processed_x = observation_input(ob_space, nbatch)
M = tf.placeholder(tf.float32, [nbatch]) #mask (done t-1)
S = tf.placeholder(tf.float32, [nenv, nlstm * 2]) #states
with tf.variable_scope("model", reuse=reuse):
h = nature_cnn(X)
xs = batch_to_seq(h, nenv, nsteps)
ms = batch_to_seq(M, nenv, nsteps)
h5, snew = lstm(xs, ms, S, 'lstm1', nh=nlstm)
h5 = seq_to_batch(h5)
vf = fc(h5, 'v', 1)
self.pd, self.pi = self.pdtype.pdfromlatent(h5)
v0 = vf[:, 0]
a0 = self.pd.sample()
neglogp0 = self.pd.neglogp(a0)
self.initial_state = np.zeros((nenv, nlstm * 2), dtype=np.float32)
def step(ob, state, mask):
return sess.run([a0, v0, snew, neglogp0], {
X: ob,
S: state,
M: mask
})
def value(ob, state, mask):
return sess.run(v0, {X: ob, S: state, M: mask})
self.X = X
self.M = M
self.S = S
self.vf = vf
self.step = step
self.value = value
def __init__(self,
sess,
ob_space,
ac_space,
nbatch,
nsteps,
reuse=False,
**conv_kwargs): #pylint: disable=W0613
self.pdtype = make_pdtype(ac_space)
#X, processed_x = observation_input(ob_space, nbatch)
X, processed_x = observation_input(ob_space, None)
with tf.variable_scope("model", reuse=reuse):
h = nature_cnn(processed_x, **conv_kwargs)
vf = fc(h, 'v', 1)[:, 0]
self.pd, self.pi = self.pdtype.pdfromlatent(h, init_scale=0.01)
a0 = self.pd.sample()
neglogp0 = self.pd.neglogp(a0)
self.initial_state = None
self.entropy = cat_entropy(self.pi)
def step(ob, *_args, **_kwargs):
a, v, neglogp = sess.run([a0, vf, neglogp0], {X: ob})
return a, v, self.initial_state, neglogp
def value(ob, *_args, **_kwargs):
return sess.run(vf, {X: ob})
def neg_log_prob(actions):
return tf.nn.sparse_softmax_cross_entropy_with_logits(
logits=self.pi, labels=actions)
self.X = X
self.vf = vf
self.step = step
self.value = value
self.neg_log_prob = neg_log_prob