def validate_probtype(probtype, pdparam):
N = 100000
# Check to see if mean negative log likelihood == differential entropy
Mval = np.repeat(pdparam[None, :], N, axis=0)
M = probtype.param_placeholder([N])
X = probtype.sample_placeholder([N])
pd = probtype.pdclass()(M)
calcloglik = U.function([X, M], pd.logp(X))
calcent = U.function([M], pd.entropy())
Xval = U.eval(pd.sample(), feed_dict={M: Mval})
logliks = calcloglik(Xval, Mval)
entval_ll = -logliks.mean() #pylint: disable=E1101
entval_ll_stderr = logliks.std() / np.sqrt(N) #pylint: disable=E1101
entval = calcent(Mval).mean() #pylint: disable=E1101
assert np.abs(entval - entval_ll) < 3 * entval_ll_stderr # within 3 sigmas
# Check to see if kldiv[p,q] = - ent[p] - E_p[log q]
M2 = probtype.param_placeholder([N])
pd2 = probtype.pdclass()(M2)
q = pdparam + np.random.randn(pdparam.size) * 0.1
Mval2 = np.repeat(q[None, :], N, axis=0)
calckl = U.function([M, M2], pd.kl(pd2))
klval = calckl(Mval, Mval2).mean() #pylint: disable=E1101
logliks = calcloglik(Xval, Mval2)
klval_ll = -entval - logliks.mean() #pylint: disable=E1101
klval_ll_stderr = logliks.std() / np.sqrt(N) #pylint: disable=E1101
assert np.abs(klval - klval_ll) < 3 * klval_ll_stderr # within 3 sigmas
def test_MpiAdam():
np.random.seed(0)
tf.set_random_seed(0)
a = tf.Variable(np.random.randn(3).astype('float32'))
b = tf.Variable(np.random.randn(2,5).astype('float32'))
loss = tf.reduce_sum(tf.square(a)) + tf.reduce_sum(tf.sin(b))
stepsize = 1e-2
update_op = tf.train.AdamOptimizer(stepsize).minimize(loss)
do_update = U.function([], loss, updates=[update_op])
tf.get_default_session().run(tf.global_variables_initializer())
for i in range(10):
print(i,do_update())
tf.set_random_seed(0)
tf.get_default_session().run(tf.global_variables_initializer())
var_list = [a,b]
lossandgrad = U.function([], [loss, U.flatgrad(loss, var_list)], updates=[update_op])
adam = MpiAdam(var_list)
for i in range(10):
l,g = lossandgrad()
adam.update(g, stepsize)
print(i,l)
def test_function():
tf.reset_default_graph()
x = tf.placeholder(tf.int32, (), name="x")
y = tf.placeholder(tf.int32, (), name="y")
z = 3 * x + 2 * y
lin = function([x, y], z, givens={y: 0})
with single_threaded_session():
initialize()
assert lin(2) == 6
assert lin(x=3) == 9
assert lin(2, 2) == 10
assert lin(x=2, y=3) == 12
def __init__(self, epsilon=1e-2, shape=()):
self._sum = tf.get_variable(dtype=tf.float64,
shape=shape,
initializer=tf.constant_initializer(0.0),
name="runningsum",
trainable=False)
self._sumsq = tf.get_variable(
dtype=tf.float64,
shape=shape,
initializer=tf.constant_initializer(epsilon),
name="runningsumsq",
trainable=False)
self._count = tf.get_variable(
dtype=tf.float64,
shape=(),
initializer=tf.constant_initializer(epsilon),
name="count",
trainable=False)
self.shape = shape
self.var_list = [self._sum, self._sumsq, self._count]
self.getflat = U.GetFlat(self.var_list)
self.setfromflat = U.SetFromFlat(self.var_list, dtype=tf.float64)
self.mean = tf.to_float(self._sum / self._count)
self.std = tf.sqrt(
tf.maximum(
tf.to_float(self._sumsq / self._count) - tf.square(self.mean),
1e-2))
newsum = tf.placeholder(shape=self.shape, dtype=tf.float64, name='sum')
newsumsq = tf.placeholder(shape=self.shape,
dtype=tf.float64,
name='var')
newcount = tf.placeholder(shape=[], dtype=tf.float64, name='count')
self.incfiltparams = U.function(
[newsum, newsumsq, newcount], [],
updates=[
tf.assign_add(self._sum, newsum),
tf.assign_add(self._sumsq, newsumsq),
tf.assign_add(self._count, newcount)
])
self.comm = MPI.COMM_WORLD
def test_multikwargs():
tf.reset_default_graph()
x = tf.placeholder(tf.int32, (), name="x")
with tf.variable_scope("other"):
x2 = tf.placeholder(tf.int32, (), name="x")
z = 3 * x + 2 * x2
lin = function([x, x2], z, givens={x2: 0})
with single_threaded_session():
initialize()
assert lin(2) == 6
assert lin(2, 2) == 10
expt_caught = False
try:
lin(x=2)
except AssertionError:
expt_caught = True
assert expt_caught