def test_gnn_errors():
graph, features, labels = pg.load_feature_dataset('synthfeats')
training, test = pg.split(list(range(len(graph))), 0.8)
training, validation = pg.split(training, 1 - 0.2 / 0.8)
from tensorflow.keras.layers import Dropout, Dense
from tensorflow.keras.regularizers import L2
class APPNP(tf.keras.Sequential):
def __init__(self, num_inputs, num_outputs, hidden=64):
super().__init__([
Dropout(0.5, input_shape=(num_inputs,)),
Dense(hidden, activation="relu", kernel_regularizer=L2(1.E-5)),
Dropout(0.5),
Dense(num_outputs, activation="relu")])
self.ranker = pg.PageRank(0.9, renormalize=True, assume_immutability=True,
use_quotient=False, error_type="iters", max_iters=10) # 10 iterations
def call(self, features, graph, training=False):
predict = super().call(features, training=training)
propagate = self.ranker.propagate(graph, predict, graph_dropout=0.5 if training else 0)
return tf.nn.softmax(propagate, axis=1)
model = APPNP(features.shape[1], labels.shape[1])
with pytest.raises(Exception):
pg.gnn_train(model, graph, features, labels, training, validation, test=test, epochs=2)
pg.load_backend('tensorflow')
pg.gnn_train(model, features, graph, labels, training, validation, test=test, epochs=300, patience=2)
predictions = model(features, graph)
pg.load_backend('numpy')
with pytest.raises(Exception):
pg.gnn_accuracy(labels, predictions, test)
def test_appnp_tf():
from tensorflow.keras.layers import Dropout, Dense
from tensorflow.keras.regularizers import L2
class APPNP(tf.keras.Sequential):
def __init__(self, num_inputs, num_outputs, hidden=64):
super().__init__([
Dropout(0.5, input_shape=(num_inputs,)),
Dense(hidden, activation="relu", kernel_regularizer=L2(1.E-5)),
Dropout(0.5),
Dense(num_outputs, activation="relu")])
self.ranker = pg.ParameterTuner(
lambda par: pg.GenericGraphFilter([par[0] ** i for i in range(int(10))],
error_type="iters", max_iters=int(10)),
max_vals=[0.95], min_vals=[0.5], verbose=False,
measure=pg.Mabs, deviation_tol=0.1, tuning_backend="numpy")
def call(self, features, graph, training=False):
predict = super().call(features, training=training)
propagate = self.ranker.propagate(graph, predict, graph_dropout=0.5 if training else 0)
return tf.nn.softmax(propagate, axis=1)
graph, features, labels = pg.load_feature_dataset('synthfeats')
training, test = pg.split(list(range(len(graph))), 0.8)
training, validation = pg.split(training, 1 - 0.2 / 0.8)
model = APPNP(features.shape[1], labels.shape[1])
with pg.Backend('tensorflow'): # pygrank computations in tensorflow backend
graph = pg.preprocessor(renormalize=True, cors=True)(graph) # cors = use in many backends
pg.gnn_train(model, features, graph, labels, training, validation,
optimizer=tf.optimizers.Adam(learning_rate=0.01), verbose=True, epochs=50)
assert float(pg.gnn_accuracy(labels, model(features, graph), test)) == 1. # dataset is super-easy to predict
def test_appnp_torch():
graph, features, labels = pg.load_feature_dataset('synthfeats')
training, test = pg.split(list(range(len(graph))), 0.8)
training, validation = pg.split(training, 1 - 0.2 / 0.8)
class AutotuneAPPNP(torch.nn.Module):
def __init__(self, num_inputs, num_outputs, hidden=64):
super().__init__()
self.layer1 = torch.nn.Linear(num_inputs, hidden)
self.layer2 = torch.nn.Linear(hidden, num_outputs)
self.activation = torch.nn.ReLU()
self.dropout = torch.nn.Dropout(0.5)
self.num_outputs = num_outputs
self.ranker = pg.PageRank(0.9,
renormalize=True,
assume_immutability=True,
error_type="iters",
max_iters=10)
def forward(self, inputs, training=False):
graph, features = inputs
predict = self.dropout(torch.FloatTensor(features))
predict = self.dropout(self.activation(self.layer1(predict)))
predict = self.activation(self.layer2(predict))
predict = self.ranker.propagate(
graph, predict, graph_dropout=0.5 if training else 0)
ret = torch.nn.functional.softmax(predict, dim=1)
self.loss = 0
for param in self.layer1.parameters():
self.loss = self.loss + 1E-5 * torch.norm(param)
return ret
def init_weights(m):
if isinstance(m, torch.nn.Linear):
torch.nn.init.xavier_uniform_(m.weight)
m.bias.data.fill_(0.01)
pg.load_backend('pytorch')
model = AutotuneAPPNP(features.shape[1], labels.shape[1])
model.apply(init_weights)
pg.gnn_train(model,
graph,
features,
labels,
training,
validation,
epochs=50,
patience=2)
# TODO: higher numbers fail only on github actions - for local tests it is fine
assert float(pg.gnn_accuracy(labels, model([graph, features]),
test)) >= 0.2
pg.load_backend('numpy')
def test_appnp_tf():
graph, features, labels = pg.load_feature_dataset('synthfeats')
training, test = pg.split(list(range(len(graph))), 0.8)
training, validation = pg.split(training, 1 - 0.2 / 0.8)
class APPNP(tf.keras.Sequential):
def __init__(self, num_inputs, num_outputs, hidden=64):
super().__init__([
tf.keras.layers.Dropout(0.5, input_shape=(num_inputs, )),
tf.keras.layers.Dense(
hidden,
activation=tf.nn.relu,
kernel_regularizer=tf.keras.regularizers.L2(1.E-5)),
tf.keras.layers.Dropout(0.5),
tf.keras.layers.Dense(num_outputs, activation=tf.nn.relu),
])
self.ranker = pg.PageRank(0.9,
renormalize=True,
assume_immutability=True,
error_type="iters",
max_iters=10)
self.input_spec = None # prevents some versions of tensorflow from checking call inputs
def call(self, inputs, training=False):
graph, features = inputs
predict = super().call(features, training=training)
predict = self.ranker.propagate(
graph, predict, graph_dropout=0.5 if training else 0)
return tf.nn.softmax(predict, axis=1)
pg.load_backend('tensorflow')
model = APPNP(features.shape[1], labels.shape[1])
pg.gnn_train(model,
graph,
features,
labels,
training,
validation,
test=test,
epochs=50)
assert float(pg.gnn_accuracy(labels, model([graph, features]),
test)) >= 0.5
pg.load_backend('numpy')
def test_appnp_torch():
graph, features, labels = pg.load_feature_dataset('synthfeats')
training, test = pg.split(list(range(len(graph))), 0.8)
training, validation = pg.split(training, 1 - 0.2 / 0.8)
class AutotuneAPPNP(torch.nn.Module):
def __init__(self, num_inputs, num_outputs, hidden=64):
super().__init__()
self.layer1 = torch.nn.Linear(num_inputs, hidden)
self.layer2 = torch.nn.Linear(hidden, num_outputs)
self.activation = torch.nn.ReLU()
self.dropout = torch.nn.Dropout(0.5)
self.num_outputs = num_outputs
self.ranker = pg.ParameterTuner(
lambda par: pg.GenericGraphFilter([par[0] ** i for i in range(int(10))],
error_type="iters", max_iters=int(10)),
max_vals=[0.95], min_vals=[0.5], verbose=False,
measure=pg.Mabs, deviation_tol=0.1, tuning_backend="numpy")
def forward(self, features, graph, training=False):
predict = self.dropout(torch.FloatTensor(features))
predict = self.dropout(self.activation(self.layer1(predict)))
predict = self.activation(self.layer2(predict))
predict = self.ranker.propagate(graph, predict, graph_dropout=0.5 if training else 0)
ret = torch.nn.functional.softmax(predict, dim=1)
self.loss = 0
for param in self.layer1.parameters():
self.loss = self.loss + 1E-5*torch.norm(param)
return ret
def init_weights(m):
if isinstance(m, torch.nn.Linear):
torch.nn.init.xavier_uniform_(m.weight)
m.bias.data.fill_(0.01)
model = AutotuneAPPNP(features.shape[1], labels.shape[1])
graph = pg.preprocessor(renormalize=True, cors=True)(graph)
model.apply(init_weights)
with pg.Backend('pytorch'):
pg.gnn_train(model, features, graph, labels, training, validation, epochs=50)
graph_dropout=self.graph_dropout if training else 0)
return tf.nn.softmax(predict, axis=1)
pg.load_backend('numpy')
graph, features, labels = pg.load_feature_dataset('cora')
for seed in range(10):
training, test = pg.split(list(range(len(graph))), 0.8, seed=seed)
training, validation = pg.split(training, 1 - 0.2 / 0.8, seed=seed)
architectures = {
"APPNP": APPNP(features.shape[1], labels.shape[1], alpha=0.9),
#"LAPPNP": APPNP(features.shape[1], labels.shape[1], alpha=tf.Variable([0.85])),
"APFNP": APPNP(features.shape[1], labels.shape[1], alpha="estimated")
}
pg.load_backend('tensorflow')
accs = dict()
for architecture, model in architectures.items():
pg.gnn_train(model,
graph,
features,
labels,
training,
validation,
test=test)
accs[architecture] = float(
pg.gnn_accuracy(labels, model([graph, features]), test))
print("seed" + str(seed) + " & " +
" & ".join(str(acc) for acc in accs.values()))
assume_immutability=True,
use_quotient=False,
error_type="iters",
max_iters=10) # 10 iterations
def call(self,
features,
graph,
training=False): # can call with tensor graph
predict = super().call(features, training=training)
propagate = self.ranker.propagate(graph,
predict,
graph_dropout=0.5 * training)
return tf.nn.softmax(propagate, axis=1)
graph, features, labels = pg.load_feature_dataset('citeseer')
training, test = pg.split(list(range(len(graph))), 0.8, seed=5) # seeded split
training, validation = pg.split(training, 1 - 0.2 / 0.8)
model = APPNP(features.shape[1], labels.shape[1])
with pg.Backend('tensorflow'): # pygrank with tensorflow backend
pg.gnn_train(model,
features,
graph,
labels,
training,
validation,
optimizer=tf.optimizers.Adam(learning_rate=0.01),
verbose=True)
print("Accuracy", pg.gnn_accuracy(labels, model(features, graph), test))
tf.keras.layers.Dense(num_outputs, activation=tf.nn.relu),
])
self.num_outputs = num_outputs
self.trainable_variables = self.mlp.trainable_variables
#self.ranker = pg.GenericGraphFilter(([0.9]+[0]*9)*5
# , error_type="iters", max_iters=50
# , renormalize=True, assume_immutability=True)
#self.ranker = pg.GenericGraphFilter([0.9]*10, renormalize=True, assume_immutability=True, tol=1.E-16)
self.ranker = pg.PageRank(0.9, renormalize=True, assume_immutability=True, error_type="iters", max_iters=10)
"""pre = pg.preprocessor(renormalize=True, assume_immutability=True)
self.ranker = pg.ParameterTuner(
lambda params: pg.GenericGraphFilter([params[0]] * int(params[1]), preprocessor=pre, tol=1.E-16),
max_vals=[0.99, 20], min_vals=[0.5, 5],
measure=pg.KLDivergence, deviation_tol=0.1, tuning_backend="numpy")"""
def __call__(self, graph, features, training=False):
predict = self.mlp(features, training=training)
predict = tf.nn.softmax(predict, axis=1)
if not training:
predict = self.ranker.propagate(graph, predict, graph_dropout=0.5 if training else 0)
return predict
pg.load_backend('tensorflow')
model = APPNP(features.shape[1], labels.shape[1])
pg.gnn_train(model, graph, features, labels, training, validation,
optimizer=tf.optimizers.Adam(learning_rate=0.01),
regularization=tf.keras.regularizers.L2(5.E-4),
epochs=300, test=test)
print("Accuracy", float(pg.gnn_accuracy(labels, model(graph, features), test)))