def sum(inputs,
indices,
latent_indicators,
num_sums,
inf_type=None,
log=False,
output=None):
if indices is None:
inputs = [inputs]
else:
inputs = [(inputs, indices)]
# Generate 'num_sums' Sum nodes, connecting each to inputs and latent_indicators
s = []
weights = []
for i in range(0, num_sums):
s = s + [spn.Sum(*inputs, latent_indicators=latent_indicators[i])]
weights = weights + [s[-1].generate_weights()]
# Connect all sum nodes to a single root Sum node and generate its weights
root = spn.Sum(*s)
root.generate_weights()
if log:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type, log=True)
else:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type,
log=False)
mpe_path_gen.get_mpe_path(root)
path_ops = [mpe_path_gen.counts[w] for w in weights]
return spn.initialize_weights(root), path_ops
def test_group_initialization(self):
"""Group initialization of weights nodes"""
v1 = spn.IVs(num_vars=1, num_vals=2)
v2 = spn.IVs(num_vars=1, num_vals=4)
s1 = spn.Sum(v1)
s1.generate_weights([0.2, 0.3])
s2 = spn.Sum(v2)
s2.generate_weights(5)
p = spn.Product(s1, s2)
init = spn.initialize_weights(p)
with tf.Session() as sess:
sess.run([init])
val1 = sess.run(s1.weights.node.get_value())
val2 = sess.run(s2.weights.node.get_value())
val1_log = sess.run(tf.exp(s1.weights.node.get_log_value()))
val2_log = sess.run(tf.exp(s2.weights.node.get_log_value()))
self.assertEqual(val1.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val2.dtype, spn.conf.dtype.as_numpy_dtype())
np.testing.assert_array_almost_equal(val1, [0.4, 0.6])
np.testing.assert_array_almost_equal(val2, [0.25, 0.25, 0.25, 0.25])
self.assertEqual(val1_log.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val2_log.dtype, spn.conf.dtype.as_numpy_dtype())
np.testing.assert_array_almost_equal(val1_log, [0.4, 0.6])
np.testing.assert_array_almost_equal(val2_log,
[0.25, 0.25, 0.25, 0.25])
def poon_single(inputs,
num_vals,
num_mixtures,
num_subsets,
inf_type,
log=False,
output=None):
# Build a POON-like network with single-op nodes
subsets = [[
spn.Sum((inputs, list(range(i * num_vals, (i + 1) * num_vals))))
for _ in range(num_mixtures)
] for i in range(num_subsets)]
products = [
spn.Product(*list(inp))
for inp in list(product(*[s for s in subsets]))
]
root = spn.Sum(*products, name="root")
# Generate dense SPN and all weights in the network
spn.generate_weights(root)
# Generate path ops based on inf_type and log
if log:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type, log=True)
else:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type,
log=False)
mpe_path_gen.get_mpe_path(root)
path_ops = [
mpe_path_gen.counts[inp]
for inp in (inputs if isinstance(inputs, list) else [inputs])
]
return root, spn.initialize_weights(root), path_ops
def test_is_valid_false(self):
"""Checking validity of the SPN"""
# Create graph
v12 = spn.IVs(num_vars=2, num_vals=4, name="V12")
v34 = spn.ContVars(num_vars=2, name="V34")
s1 = spn.Sum((v12, [0, 1, 2, 3]), name="S1")
s2 = spn.Sum((v12, [4, 5, 6, 7]), name="S2")
p1 = spn.Product((v12, [0, 7]), name="P1")
p2 = spn.Product((v12, [2, 3, 4]), name="P2")
p3 = spn.Product(v34, name="P3")
n1 = spn.Concat(s1, s2, p3, name="N1")
n2 = spn.Concat(p1, p2, name="N2")
p4 = spn.Product((n1, [0]), (n1, [1]), name="P4")
p5 = spn.Product((n2, [0]), (n1, [2]), name="P5")
s3 = spn.Sum(p4, n2, name="S3")
p6 = spn.Product(s3, (n1, [2]), name="P6")
s4 = spn.Sum(p5, p6, name="S4")
# Test
self.assertTrue(v12.is_valid())
self.assertTrue(v34.is_valid())
self.assertTrue(s1.is_valid())
self.assertTrue(s2.is_valid())
self.assertTrue(p1.is_valid())
self.assertTrue(p3.is_valid())
self.assertTrue(p4.is_valid())
self.assertTrue(n1.is_valid())
self.assertFalse(p2.is_valid())
self.assertFalse(n2.is_valid())
self.assertFalse(s3.is_valid())
self.assertFalse(s4.is_valid())
self.assertFalse(p5.is_valid())
self.assertFalse(p6.is_valid())
def sum(inputs,
indices,
latent_indicators,
num_sums,
inf_type,
log=False,
output=None):
if indices is None:
inputs = [inputs for _ in range(num_sums)]
else:
inputs = [(inputs, ind) for ind in indices]
# Generate 'num_sums' Sum nodes, connecting each to inputs and latent_indicators
s = []
for inp, iv in zip(inputs, latent_indicators):
s = s + [spn.Sum(inp, latent_indicators=iv)]
# Generate weights for each Sum node
s[-1].generate_weights()
# Connect all sum nodes to a single root Sum node and generate its weights
root = spn.Sum(*s)
root.generate_weights()
if log:
value_op = root.get_log_value(inference_type=inf_type)
else:
value_op = root.get_value(inference_type=inf_type)
return spn.initialize_weights(root), value_op
def test_get_out_size(self):
"""Computing the sizes of the outputs of nodes in SPN graph"""
# Generate graph
v1 = spn.ContVars(num_vars=5)
v2 = spn.ContVars(num_vars=5)
v3 = spn.ContVars(num_vars=5)
s1 = spn.Sum((v1, [1, 3]), (v1, [1, 4]), v2) # v1 included twice
s2 = spn.Sum(v1, (v3, [0, 1, 2, 3, 4]))
s3 = spn.Sum(v2, v3, v3) # v3 included twice
n4 = spn.Concat(s1, v1)
n5 = spn.Concat((v3, [0, 4]), s3)
n6 = spn.Concat(n4, s2, n5, (n4, [0]), (n5, [1])) # n4 and n5 included twice
# Test
num = v1.get_out_size()
self.assertEqual(num, 5)
num = v2.get_out_size()
self.assertEqual(num, 5)
num = v3.get_out_size()
self.assertEqual(num, 5)
num = s1.get_out_size()
self.assertEqual(num, 1)
num = s2.get_out_size()
self.assertEqual(num, 1)
num = s3.get_out_size()
self.assertEqual(num, 1)
num = n4.get_out_size()
self.assertEqual(num, 6)
num = n5.get_out_size()
self.assertEqual(num, 3)
num = n6.get_out_size()
self.assertEqual(num, 12)
def test_compute_valid(self):
"""Calculating validity of Sum"""
# Without IVs
v12 = spn.IVs(num_vars=2, num_vals=4)
v34 = spn.ContVars(num_vars=2)
s1 = spn.Sum((v12, [0, 1, 2, 3]))
s2 = spn.Sum((v12, [0, 1, 2, 4]))
s3 = spn.Sum((v12, [0, 1, 2, 3]), (v34, 0))
p1 = spn.Product((v12, [0, 5]), (v34, 0))
p2 = spn.Product((v12, [1, 6]), (v34, 0))
p3 = spn.Product((v12, [1, 6]), (v34, 1))
s4 = spn.Sum(p1, p2)
s5 = spn.Sum(p1, p3)
self.assertTrue(v12.is_valid())
self.assertTrue(v34.is_valid())
self.assertTrue(s1.is_valid())
self.assertFalse(s2.is_valid())
self.assertFalse(s3.is_valid())
self.assertTrue(s4.is_valid())
self.assertFalse(s5.is_valid())
# With IVS
s6 = spn.Sum(p1, p2)
s6.generate_ivs()
self.assertTrue(s6.is_valid())
s7 = spn.Sum(p1, p2)
s7.set_ivs(spn.ContVars(num_vars=2))
self.assertFalse(s7.is_valid())
s8 = spn.Sum(p1, p2)
s8.set_ivs(spn.IVs(num_vars=2, num_vals=2))
with self.assertRaises(spn.StructureError):
s8.is_valid()
s9 = spn.Sum(p1, p2)
s9.set_ivs((v12, [0, 3]))
self.assertTrue(s9.is_valid())
def test_get_scope(self):
"""Computing the scope of nodes of the SPN graph"""
# Create graph
v12 = spn.IVs(num_vars=2, num_vals=4, name="V12")
v34 = spn.ContVars(num_vars=2, name="V34")
s1 = spn.Sum((v12, [0, 1, 2, 3]), name="S1")
s2 = spn.Sum((v12, [4, 5, 6, 7]), name="S2")
p1 = spn.Product((v12, [0, 7]), name="P1")
p2 = spn.Product((v12, [3, 4]), name="P2")
p3 = spn.Product(v34, name="P3")
n1 = spn.Concat(s1, s2, p3, name="N1")
n2 = spn.Concat(p1, p2, name="N2")
p4 = spn.Product((n1, [0]), (n1, [1]), name="P4")
p5 = spn.Product((n2, [0]), (n1, [2]), name="P5")
s3 = spn.Sum(p4, n2, name="S3")
p6 = spn.Product(s3, (n1, [2]), name="P6")
s4 = spn.Sum(p5, p6, name="S4")
# Test
self.assertListEqual(v12.get_scope(),
[spn.Scope(v12, 0), spn.Scope(v12, 0),
spn.Scope(v12, 0), spn.Scope(v12, 0),
spn.Scope(v12, 1), spn.Scope(v12, 1),
spn.Scope(v12, 1), spn.Scope(v12, 1)])
self.assertListEqual(v34.get_scope(),
[spn.Scope(v34, 0), spn.Scope(v34, 1)])
self.assertListEqual(s1.get_scope(),
[spn.Scope(v12, 0)])
self.assertListEqual(s2.get_scope(),
[spn.Scope(v12, 1)])
self.assertListEqual(p1.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1)])
self.assertListEqual(p2.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1)])
self.assertListEqual(p3.get_scope(),
[spn.Scope(v34, 0) | spn.Scope(v34, 1)])
self.assertListEqual(n1.get_scope(),
[spn.Scope(v12, 0),
spn.Scope(v12, 1),
spn.Scope(v34, 0) | spn.Scope(v34, 1)])
self.assertListEqual(n2.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1),
spn.Scope(v12, 0) | spn.Scope(v12, 1)])
self.assertListEqual(p4.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1)])
self.assertListEqual(p5.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1) |
spn.Scope(v34, 0) | spn.Scope(v34, 1)])
self.assertListEqual(s3.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1)])
self.assertListEqual(p6.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1) |
spn.Scope(v34, 0) | spn.Scope(v34, 1)])
self.assertListEqual(s4.get_scope(),
[spn.Scope(v12, 0) | spn.Scope(v12, 1) |
spn.Scope(v34, 0) | spn.Scope(v34, 1)])
def test_group_initialization(self):
"""Group initialization of weights nodes"""
v1 = spn.IVs(num_vars=1, num_vals=2)
v2 = spn.IVs(num_vars=1, num_vals=4)
v3 = spn.IVs(num_vars=1, num_vals=2)
v4 = spn.IVs(num_vars=1, num_vals=2)
# Sum
s1 = spn.Sum(v1)
s1.generate_weights(tf.initializers.constant([0.2, 0.3]))
s2 = spn.Sum(v2)
s2.generate_weights(tf.initializers.constant(5))
# ParSums
s3 = spn.ParSums(*[v3, v4], num_sums=2)
s3.generate_weights(
tf.initializers.constant([0.1, 0.2, 0.3, 0.4, 0.4, 0.3, 0.2, 0.1]))
s4 = spn.ParSums(*[v1, v2, v3, v4], num_sums=3)
s4.generate_weights(tf.initializers.constant(2.0))
# Product
p = spn.Product(s1, s2, s3, s4)
init = spn.initialize_weights(p)
with self.test_session() as sess:
sess.run([init])
val1 = sess.run(s1.weights.node.get_value())
val2 = sess.run(s2.weights.node.get_value())
val3 = sess.run(s3.weights.node.get_value())
val4 = sess.run(s4.weights.node.get_value())
val1_log = sess.run(tf.exp(s1.weights.node.get_log_value()))
val2_log = sess.run(tf.exp(s2.weights.node.get_log_value()))
val3_log = sess.run(tf.exp(s3.weights.node.get_log_value()))
val4_log = sess.run(tf.exp(s4.weights.node.get_log_value()))
self.assertEqual(val1.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val2.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val3.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val4.dtype, spn.conf.dtype.as_numpy_dtype())
np.testing.assert_array_almost_equal(val1, [[0.4, 0.6]])
np.testing.assert_array_almost_equal(val2, [[0.25, 0.25, 0.25, 0.25]])
np.testing.assert_array_almost_equal(
val3, [[0.1, 0.2, 0.3, 0.4], [0.4, 0.3, 0.2, 0.1]])
np.testing.assert_array_almost_equal(
val4, [[0.1] * 10, [0.1] * 10, [0.1] * 10])
self.assertEqual(val1_log.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val2_log.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val3_log.dtype, spn.conf.dtype.as_numpy_dtype())
self.assertEqual(val4_log.dtype, spn.conf.dtype.as_numpy_dtype())
np.testing.assert_array_almost_equal(val1_log, [[0.4, 0.6]])
np.testing.assert_array_almost_equal(val2_log,
[[0.25, 0.25, 0.25, 0.25]])
np.testing.assert_array_almost_equal(
val3, [[0.1, 0.2, 0.3, 0.4], [0.4, 0.3, 0.2, 0.1]])
np.testing.assert_array_almost_equal(
val4, [[0.1] * 10, [0.1] * 10, [0.1] * 10])
def _build_op(self, inputs, placeholders, conf):
""" Creates the graph using only ParSum nodes """
# TODO make sure the ivs are correct
sum_indices, weights, ivs = inputs.indices, inputs.weights, None
log, inf_type = conf.log, conf.inf_type
weights = np.split(
weights,
np.cumsum([len(ind) * inputs.num_parallel
for ind in sum_indices])[:-1])
parallel_sum_nodes = []
for ind in sum_indices:
parallel_sum_nodes.append(
spn.ParSums((placeholders[0], ind),
num_sums=inputs.num_parallel))
weight_nodes = [
self._generate_weights(node, w.tolist())
for node, w in zip(parallel_sum_nodes, weights)
]
if ivs:
[s.set_ivs(iv) for s, iv in zip(parallel_sum_nodes, ivs)]
root = spn.Sum(*parallel_sum_nodes)
self._generate_weights(root)
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type, log=log)
mpe_path_gen.get_mpe_path(root)
path_op = [mpe_path_gen.counts[w] for w in weight_nodes]
input_counts = [mpe_path_gen.counts[inp] for inp in placeholders]
return tf.tuple(
path_op + input_counts)[:len(path_op)], self._initialize_from(root)
def mnist_01(inputs, num_decomps, num_subsets, num_mixtures, num_input_mixtures,
balanced, input_dist, node_type, inf_type, log=False):
# Learning Parameters
additive_smoothing = 100
min_additive_smoothing = 1
# Weight initialization
weight_init_value = tf.initializers.random_uniform(10, 11)
# Generate SPN structure
dense_gen = spn.DenseSPNGenerator(num_decomps=num_decomps,
num_subsets=num_subsets,
num_mixtures=num_mixtures,
input_dist=(spn.DenseSPNGenerator.
InputDist.RAW if input_dist is
"RAW" else spn.
DenseSPNGenerator.
InputDist.MIXTURE),
num_input_mixtures=num_input_mixtures,
balanced=balanced,
node_type=node_type)
root0 = dense_gen.generate(inputs, root_name="root_0")
root1 = dense_gen.generate(inputs, root_name="root_1")
root = spn.Sum(root0, root1, name="root")
spn.generate_weights(root, initializer=weight_init_value)
latent = root.generate_latent_indicators()
# Add EM Learning
additive_smoothing_var = tf.Variable(additive_smoothing, dtype=spn.conf.dtype)
learning = spn.HardEMLearning(root, log=log, value_inference_type=inf_type,
additive_smoothing=additive_smoothing_var)
return root, latent, learning, additive_smoothing, min_additive_smoothing, \
additive_smoothing_var
def sums(inputs,
indices,
ivs,
num_sums,
inf_type=None,
log=True,
output=None):
if indices is None:
inputs = [inputs for _ in range(num_sums)]
else:
inputs = [(inputs, indices) for _ in range(num_sums)]
# Generate a single Sums node, modeling 'num_sums' sum nodes within,
# connecting it to inputs and ivs
s = spn.Sums(*inputs, num_sums=num_sums, ivs=ivs[-1])
# Generate weights of the Sums node
weights = s.generate_weights()
# Connect the Sums nodes to a single root Sum node and generate its weights
root = spn.Sum(s)
root.generate_weights()
if log:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type, log=True)
else:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type,
log=False)
mpe_path_gen.get_mpe_path(root)
path_op = [mpe_path_gen.counts[weights]]
return spn.initialize_weights(root), path_op
def par_sums(inputs,
indices,
latent_indicators,
num_sums,
inf_type=None,
log=True,
output=None):
if indices is None:
inputs = [inputs]
else:
inputs = [(inputs, indices)]
# Generate a single ParallelSums node, modeling 'num_sums' sum nodes
# within, connecting it to inputs and latent_indicators
s = spn.ParallelSums(*inputs,
num_sums=num_sums,
latent_indicators=latent_indicators[-1])
# Generate weights of the ParallelSums node
weights = s.generate_weights()
# Connect the ParallelSums nodes to a single root Sum node and generate
# its weights
root = spn.Sum(s)
root.generate_weights()
if log:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type, log=True)
else:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type,
log=False)
mpe_path_gen.get_mpe_path(root)
path_op = [mpe_path_gen.counts[weights]]
return spn.initialize_weights(root), path_op
def par_sums(inputs,
indices,
ivs,
num_sums,
inf_type,
log=True,
output=None):
if indices is None:
inputs = [inputs]
else:
inputs = [(inputs, indices)]
# Generate a single ParSums node, modeling 'num_sums' sum nodes
# within, connecting it to inputs and ivs
s = spn.ParSums(*inputs, num_sums=num_sums, ivs=ivs[0])
# Generate weights of the ParSums node
s.generate_weights()
# Connect the ParSums nodes to a single root Sum node and generate
# its weights
root = spn.Sum(s)
root.generate_weights()
if log:
value_op = root.get_log_value(inference_type=inf_type)
else:
value_op = root.get_value(inference_type=inf_type)
return spn.initialize_weights(root), value_op
def sums(inputs,
indices,
latent_indicators,
num_sums,
inf_type,
log=True,
output=None):
if indices is None:
inputs = [inputs for _ in range(num_sums)]
else:
inputs = [(inputs, ind) for ind in indices]
# Generate a single Sums node, modeling 'num_sums' sum nodes within,
# connecting it to inputs and latent_indicators
s = spn.Sums(*inputs,
num_sums=num_sums,
latent_indicators=latent_indicators[0])
# Generate weights of the Sums node
s.generate_weights()
# Connect the Sums nodes to a single root Sum node and generate its weights
root = spn.Sum(s)
root.generate_weights()
if log:
value_op = root.get_log_value(inference_type=inf_type)
else:
value_op = root.get_value(inference_type=inf_type)
return spn.initialize_weights(root), value_op
def test_input_flags(self):
"""Detection of different types of inputs"""
inpt = spn.Input()
self.assertFalse(inpt)
self.assertFalse(inpt.is_op)
self.assertFalse(inpt.is_var)
self.assertFalse(inpt.is_param)
n = spn.Sum()
inpt = spn.Input(n)
self.assertTrue(inpt)
self.assertTrue(inpt.is_op)
self.assertFalse(inpt.is_var)
self.assertFalse(inpt.is_param)
n = spn.ContVars()
inpt = spn.Input(n)
self.assertTrue(inpt)
self.assertFalse(inpt.is_op)
self.assertTrue(inpt.is_var)
self.assertFalse(inpt.is_param)
n = spn.Weights()
inpt = spn.Input(n)
self.assertTrue(inpt)
self.assertFalse(inpt.is_op)
self.assertFalse(inpt.is_var)
self.assertTrue(inpt.is_param)
def _build_root_and_value(inf_type, log, sum_nodes):
""" Connects the sum node outputs to a single root as a way of grouping Ops """
root = spn.Sum(*sum_nodes)
root.generate_weights()
if log:
value_op = root.get_log_value(inference_type=inf_type)
else:
value_op = root.get_value(inference_type=inf_type)
return root, value_op
def mnist_all(inputs,
num_decomps,
num_subsets,
num_mixtures,
num_input_mixtures,
balanced,
input_dist,
node_type,
inf_type,
log=False):
# Learning Parameters
additive_smoothing = 0
min_additive_smoothing = 0
initial_accum_value = 20
# Weight initialization
weight_init_value = tf.initializers.random_uniform(0, 1)
# Add random values before max
add_random = None
use_unweighted = True
# Generate SPN structure
dense_gen = spn.DenseSPNGenerator(
num_decomps=num_decomps,
num_subsets=num_subsets,
num_mixtures=num_mixtures,
input_dist=(spn.DenseSPNGenerator.InputDist.RAW
if input_dist is "RAW" else
spn.DenseSPNGenerator.InputDist.MIXTURE),
num_input_mixtures=num_input_mixtures,
balanced=balanced,
node_type=node_type)
class_roots = [
dense_gen.generate(inputs, root_name=("Class_%d" % i))
for i in range(10)
]
root = spn.Sum(*class_roots, name="root")
spn.generate_weights(root, init_value=weight_init_value)
latent = root.generate_ivs()
# Add EM Learning
additive_smoothing_var = tf.Variable(additive_smoothing,
dtype=spn.conf.dtype)
learning = spn.EMLearning(root,
log=log,
value_inference_type=inf_type,
additive_smoothing=additive_smoothing_var,
add_random=add_random,
initial_accum_value=initial_accum_value,
use_unweighted=use_unweighted)
return root, latent, learning, additive_smoothing, min_additive_smoothing, \
additive_smoothing_var
def test_compute_mpe_path_noivs(self):
spn.conf.argmax_zero = True
v12 = spn.IVs(num_vars=2, num_vals=4)
v34 = spn.ContVars(num_vars=2)
v5 = spn.ContVars(num_vars=1)
s = spn.Sum((v12, [0, 5]), v34, (v12, [3]), v5)
w = s.generate_weights()
counts = tf.placeholder(tf.float32, shape=(None, 1))
op = s._compute_log_mpe_path(tf.identity(counts), w.get_log_value(),
None, v12.get_log_value(),
v34.get_log_value(), v12.get_log_value(),
v5.get_log_value())
init = w.initialize()
counts_feed = [[10], [11], [12], [13]]
v12_feed = [[0, 1], [1, 1], [0, 0], [3, 3]]
v34_feed = [[0.1, 0.2], [1.2, 0.2], [0.1, 0.2], [0.9, 0.8]]
v5_feed = [[0.5], [0.5], [1.2], [0.9]]
with self.test_session() as sess:
sess.run(init)
# Skip the IVs op
out = sess.run(op[:1] + op[2:],
feed_dict={
counts: counts_feed,
v12: v12_feed,
v34: v34_feed,
v5: v5_feed
})
# Weights
np.testing.assert_array_almost_equal(
np.squeeze(out[0]),
np.array([[10., 0., 0., 0., 0., 0.], [0., 0., 11., 0., 0., 0.],
[0., 0., 0., 0., 0., 12.], [0., 0., 0., 0., 13., 0.]],
dtype=np.float32))
np.testing.assert_array_almost_equal(
out[1],
np.array([[10., 0., 0., 0., 0., 0., 0., 0.],
[0., 0., 0., 0., 0., 0., 0., 0.],
[0., 0., 0., 0., 0., 0., 0., 0.],
[0., 0., 0., 0., 0., 0., 0., 0.]],
dtype=np.float32))
np.testing.assert_array_almost_equal(
out[2],
np.array([[0., 0.], [11., 0.], [0., 0.], [0., 0.]],
dtype=np.float32))
np.testing.assert_array_almost_equal(
out[3],
np.array([[0., 0., 0., 0., 0., 0., 0., 0.],
[0., 0., 0., 0., 0., 0., 0., 0.],
[0., 0., 0., 0., 0., 0., 0., 0.],
[0., 0., 0., 13., 0., 0., 0., 0.]],
dtype=np.float32))
np.testing.assert_array_almost_equal(
out[4], np.array([[0.], [0.], [12.], [0.]], dtype=np.float32))
def poon_single(inputs, num_vals, num_mixtures, num_subsets, inf_type,
log=False, output=None):
# Build a POON-like network with single-op nodes
subsets = [[spn.Sum((inputs, list(range(i*num_vals, (i+1)*num_vals))))
for _ in range(num_mixtures)] for i in range(num_subsets)]
products = [spn.Product(*list(inp)) for inp in list(product(*[s for s in
subsets]))]
root = spn.Sum(*products, name="root")
# Generate dense SPN and all weights in the network
spn.generate_weights(root)
# Generate value ops based on inf_type and log
if log:
value_op = root.get_log_value(inference_type=inf_type)
else:
value_op = root.get_value(inference_type=inf_type)
return root, spn.initialize_weights(root), value_op
def test_traverse_graph_nostop_noparams(self):
"""Traversing the whole graph excluding param nodes"""
counter = [0]
nodes = [None] * 10
def fun(node):
nodes[counter[0]] = node
counter[0] += 1
# Generate graph
v1 = spn.RawLeaf(num_vars=1)
v2 = spn.RawLeaf(num_vars=1)
v3 = spn.RawLeaf(num_vars=1)
s1 = spn.Sum(v1, v1, v2) # v1 included twice
s2 = spn.Sum(v1, v3)
s3 = spn.Sum(v2, v3, v3) # v3 included twice
s4 = spn.Sum(s1, v1)
s5 = spn.Sum(s2, v3, s3)
s6 = spn.Sum(s4, s2, s5, s4, s5) # s4 and s5 included twice
spn.generate_weights(s6)
# Traverse
spn.traverse_graph(s6, fun=fun, skip_params=True)
# Test
self.assertEqual(counter[0], 9)
self.assertIs(nodes[0], s6)
self.assertIs(nodes[1], s4)
self.assertIs(nodes[2], s2)
self.assertIs(nodes[3], s5)
self.assertIs(nodes[4], s1)
self.assertIs(nodes[5], v1)
self.assertIs(nodes[6], v3)
self.assertIs(nodes[7], s3)
self.assertIs(nodes[8], v2)
def test_compute_graph_up_noconst(self):
"""Computing value assuming no constant functions"""
# Number of times val_fun was called
# Use list to avoid creating local fun variable during assignment
counter = [0]
def val_fun(node, *inputs):
counter[0] += 1
if isinstance(node, spn.graph.node.VarNode):
return 1
elif isinstance(node, spn.graph.node.ParamNode):
return 0.1
else:
weight_val, iv_val, *values = inputs
return weight_val + sum(values) + 1
# Generate graph
v1 = spn.RawLeaf(num_vars=1)
v2 = spn.RawLeaf(num_vars=1)
v3 = spn.RawLeaf(num_vars=1)
s1 = spn.Sum(v1, v1, v2) # v1 included twice
s2 = spn.Sum(v1, v3)
s3 = spn.Sum(v2, v3, v3) # v3 included twice
s4 = spn.Sum(s1, v1)
s5 = spn.Sum(s2, v3, s3)
s6 = spn.Sum(s4, s2, s5, s4, s5) # s4 and s5 included twice
spn.generate_weights(s6)
# Calculate value
val = spn.compute_graph_up(s6, val_fun)
# Test
self.assertAlmostEqual(val, 35.2)
self.assertEqual(counter[0], 15)
def perm_products(inputs,
num_inputs,
num_input_cols,
num_prods,
inf_type,
indices=None,
log=False,
output=None):
if indices is not None:
# Create inputs list with indices
inputs = [[(inp, ind) for inp, ind in zip(inps, inds)]
for inps, inds in zip(inputs, indices)]
if isinstance(inputs,
list): # Is a list of ContVars inputs - Multiple inputs
# Generate 'len(inputs)' PermProducts nodes, modeling 'n_prods' products
# within each
p = [spn.PermProducts(*inps) for inps in inputs]
else: # Is a single input of type ContVars - A single input
num_inputs_array = np.array(num_inputs)
num_input_cols_array = np.array(num_input_cols)
num_cols = num_input_cols[0]
num_vars = int(np.sum(num_inputs_array * num_input_cols_array))
indices_list = [
list(range(i, i + num_cols))
for i in range(0, num_vars, num_cols)
]
num_inputs_cumsum = np.cumsum(num_inputs_array).tolist()
num_inputs_cumsum.insert(0, 0)
inputs_list = [[(inputs, inds)
for inds in indices_list[start:stop]]
for start, stop in zip(num_inputs_cumsum[:-1],
num_inputs_cumsum[1:])]
# Generate 'len(inputs)' PermProducts nodes, modeling 'n_prods'
# products within each, and inputs for each node emination from a
# commoninput source
p = [spn.PermProducts(*inps) for inps in inputs_list]
# Connect all PermProducts nodes to a single root Sum node and generate
# its weights
root = spn.Sum(*p)
root.generate_weights()
if log:
value_op = root.get_log_value(inference_type=inf_type)
else:
value_op = root.get_value(inference_type=inf_type)
return spn.initialize_weights(root), value_op
def test_get_num_nodes(self):
"""Computing the number of nodes in the SPN graph"""
# Generate graph
v1 = spn.ContVars(num_vars=1)
v2 = spn.ContVars(num_vars=1)
v3 = spn.ContVars(num_vars=1)
s1 = spn.Sum(v1, v1, v2) # v1 included twice
s2 = spn.Sum(v1, v3)
s3 = spn.Sum(v2, v3, v3) # v3 included twice
s4 = spn.Sum(s1, v1)
s5 = spn.Sum(s2, v3, s3)
s6 = spn.Sum(s4, s2, s5, s4, s5) # s4 and s5 included twice
spn.generate_weights(s6)
# Test
num = v1.get_num_nodes(skip_params=True)
self.assertEqual(num, 1)
num = v1.get_num_nodes(skip_params=False)
self.assertEqual(num, 1)
num = v2.get_num_nodes(skip_params=True)
self.assertEqual(num, 1)
num = v2.get_num_nodes(skip_params=False)
self.assertEqual(num, 1)
num = v3.get_num_nodes(skip_params=True)
self.assertEqual(num, 1)
num = v3.get_num_nodes(skip_params=False)
self.assertEqual(num, 1)
num = s1.get_num_nodes(skip_params=True)
self.assertEqual(num, 3)
num = s1.get_num_nodes(skip_params=False)
self.assertEqual(num, 4)
num = s2.get_num_nodes(skip_params=True)
self.assertEqual(num, 3)
num = s2.get_num_nodes(skip_params=False)
self.assertEqual(num, 4)
num = s3.get_num_nodes(skip_params=True)
self.assertEqual(num, 3)
num = s3.get_num_nodes(skip_params=False)
self.assertEqual(num, 4)
num = s4.get_num_nodes(skip_params=True)
self.assertEqual(num, 4)
num = s4.get_num_nodes(skip_params=False)
self.assertEqual(num, 6)
num = s5.get_num_nodes(skip_params=True)
self.assertEqual(num, 6)
num = s5.get_num_nodes(skip_params=False)
self.assertEqual(num, 9)
num = s6.get_num_nodes(skip_params=True)
self.assertEqual(num, 9)
num = s6.get_num_nodes(skip_params=False)
self.assertEqual(num, 15)
def test_gather_input_scopes(self):
v12 = spn.IVs(num_vars=2, num_vals=4, name="V12")
v34 = spn.ContVars(num_vars=2, name="V34")
s1 = spn.Sum(v12, v12, v34, (v12, [7, 3, 1, 0]), (v34, 0), name="S1")
scopes_v12 = v12._compute_scope()
scopes_v34 = v34._compute_scope()
# Note: weights/ivs are disconnected, so None should be output these
scopes = s1._gather_input_scopes(None, None, None, scopes_v12,
scopes_v34, scopes_v12, scopes_v34)
self.assertTupleEqual(
scopes, (None, None, None, scopes_v12, scopes_v34, [
scopes_v12[7], scopes_v12[3], scopes_v12[1], scopes_v12[0]
], [scopes_v34[0]]))
def sum(inputs, sum_indices, repetitions, inf_type, log=False, ivs=None):
""" Creates the graph using only Sum nodes """
sum_nodes = []
for ind in sum_indices:
sum_nodes.extend(
[spn.Sum((inputs, ind)) for _ in range(repetitions)])
[s.generate_weights() for s in sum_nodes]
if ivs:
[s.set_ivs(iv) for s, iv in zip(sum_nodes, ivs)]
root, value_op = Ops._build_root_and_value(inf_type, log, sum_nodes)
return spn.initialize_weights(root), value_op
def products(inputs,
num_inputs,
num_input_cols,
num_prods,
inf_type,
indices=None,
log=False,
output=None):
p = []
# Generate 'len(inputs)' Products node, modelling 'n_prods' ∈ 'num_prods'
# products within each
for inps, n_inp_cols, n_prods in zip(inputs, num_input_cols,
num_prods):
num_inputs = len(inps)
# Create permuted indices based on number and size of inps
inds = map(int, np.arange(n_inp_cols))
permuted_inds = list(product(inds, repeat=num_inputs))
permuted_inds_list = [list(elem) for elem in permuted_inds]
permuted_inds_list_of_list = []
for elem in permuted_inds_list:
permuted_inds_list_of_list.append(
[elem[i:i + 1] for i in range(0, len(elem), 1)])
# Create inputs-list by combining inps and indices
permuted_inputs = []
for indices in permuted_inds_list_of_list:
permuted_inputs.append([tuple(i) for i in zip(inps, indices)])
permuted_inputs = list(chain.from_iterable(permuted_inputs))
# Generate a single Products node, modeling 'n_prods' product nodes
# within, connecting it to inputs
p = p + [spn.Products(*permuted_inputs, num_prods=n_prods)]
# Connect all product nodes to a single root Sum node and generate its
# weights
root = spn.Sum(*p)
root.generate_weights()
if log:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type, log=True)
else:
mpe_path_gen = spn.MPEPath(value_inference_type=inf_type,
log=False)
mpe_path_gen.get_mpe_path(root)
path_ops = [
mpe_path_gen.counts[inp]
for inp in list(chain.from_iterable(inputs))
]
return spn.initialize_weights(root), path_ops
def test(values, ivs, weights, feed, output):
with self.subTest(values=values, ivs=ivs, weights=weights,
feed=feed):
n = spn.Sum(*values, ivs=ivs)
n.generate_weights(weights)
op = n.get_value(spn.InferenceType.MARGINAL)
op_log = n.get_log_value(spn.InferenceType.MARGINAL)
with tf.Session() as sess:
spn.initialize_weights(n).run()
out = sess.run(op, feed_dict=feed)
out_log = sess.run(tf.exp(op_log), feed_dict=feed)
np.testing.assert_array_almost_equal(
out,
np.array(output, dtype=spn.conf.dtype.as_numpy_dtype()))
np.testing.assert_array_almost_equal(
out_log,
np.array(output, dtype=spn.conf.dtype.as_numpy_dtype()))
def test_generte_set_errors(self):
"""Detecting structure errors in __generate_set"""
gen = spn.DenseSPNGenerator(num_decomps=2,
num_subsets=3,
num_mixtures=2)
v1 = spn.IVs(num_vars=2, num_vals=4)
v2 = spn.ContVars(num_vars=3, name="ContVars1")
v3 = spn.ContVars(num_vars=2, name="ContVars2")
s1 = spn.Sum(v3, v2)
n1 = spn.Concat(v2)
with self.assertRaises(spn.StructureError):
gen._DenseSPNGenerator__generate_set([
spn.Input(v1, [0, 3, 2, 6, 7]),
spn.Input(v2, [1, 2]),
spn.Input(s1, None),
spn.Input(n1, None)
])
def test_sum_update_1(self):
child1 = spn.GaussianLeaf(num_vars=1,
num_components=1,
total_counts_init=3,
loc_init=0.0,
scale_init=1.0,
learn_dist_params=True)
child2 = spn.GaussianLeaf(num_vars=1,
num_components=1,
total_counts_init=7,
loc_init=1.0,
scale_init=4.0,
learn_dist_params=True)
root = spn.Sum(child1, child2)
root.generate_weights()
value_inference_type = spn.InferenceType.MARGINAL
init_weights = spn.initialize_weights(root)
learning = spn.EMLearning(root,
log=True,
value_inference_type=value_inference_type,
use_unweighted=True)
reset_accumulators = learning.reset_accumulators()
accumulate_updates = learning.accumulate_updates()
update_spn = learning.update_spn()
train_likelihood = learning.value.values[root]
with self.test_session() as sess:
sess.run(init_weights)
sess.run(reset_accumulators)
sess.run(accumulate_updates, {child1: [[0.0]], child2: [[0.0]]})
sess.run(update_spn)
child1_n = sess.run(child1._total_count_variable)
child2_n = sess.run(child2._total_count_variable)
# equalWeight is true, so update passes the data point to the component
# with highest likelihood without considering the weight of each component.
# In this case, N(0|0,1) > N(0|1,4), so child1 is picked.
# If component weights are taken into account, then child2 will be picked
# since 0.3*N(0|0,1) < 0.7*N(0|1,4).
# self.assertEqual(root.n, 11)
self.assertEqual(child1_n, 4)
self.assertEqual(child2_n, 7)
