def test_ensemble_model():
X = np.vstack(
(np.arange(30, 10,
-2, dtype='float64'), np.arange(100,
90,
-1,
dtype='float64'))).T
Y = np.arange(10, dtype='float64')
rf = regressors.randomforest(random_state=42)
nn = regressors.neuralnetwork(solver='lbfgs', random_state=42)
ensemble = ensemble_model((rf, nn))
# we do not need to fit underlying models, they change when we fit enseble
ensemble.fit(X, Y)
pred = ensemble.predict(X)
mean_pred = np.vstack((rf.predict(X), nn.predict(X))).mean(axis=0)
assert_array_almost_equal(pred, mean_pred)
assert_almost_equal(ensemble.score(X, Y), r2_score(Y, pred))
# ensemble of a single model should behave exactly like this model
nn = neuralnetwork(solver='lbfgs', random_state=42)
ensemble = ensemble_model((nn, ))
ensemble.fit(X, Y)
assert_array_almost_equal(ensemble.predict(X), nn.predict(X))
assert_almost_equal(ensemble.score(X, Y), nn.score(X, Y))
def train(self, sf_pickle = ''):
# load precomputed descriptors and target values
self.train_descs = np.loadtxt(dirname(__file__) + '/NNScore/train_descs.csv', delimiter=',', dtype=float)
self.train_target = np.loadtxt(dirname(__file__) + '/NNScore/train_target.csv', delimiter=',', dtype=float)
self.test_descs = np.loadtxt(dirname(__file__) + '/NNScore/test_descs.csv', delimiter=',', dtype=float)
self.test_target = np.loadtxt(dirname(__file__) + '/NNScore/test_target.csv', delimiter=',', dtype=float)
n_dim = (~((self.train_descs == 0).all(axis=0) | (self.train_descs.min(axis=0) == self.train_descs.max(axis=0)))).sum()
# number of network to sample; original implementation did 1000, but 100 give results good enough.
n = 1000
trained_nets = Parallel(n_jobs=self.n_jobs)(delayed(_parallel_helper)(neuralnetwork([n_dim,5,1]), 'fit', self.train_descs, self.train_target, train_alg='tnc', maxfun=1000) for i in xrange(n))
# get 20 best
best_idx = np.array([net.score(self.test_descs, self.test_target.flatten()) for net in trained_nets]).argsort()[::-1][:20]
self.model = ensemble_model([trained_nets[i] for i in best_idx])
r2 = self.model.score(self.test_descs, self.test_target)
r = np.sqrt(r2)
print 'Test set: R**2:', r2, ' R:', r
r2 = self.model.score(self.train_descs, self.train_target)
r = np.sqrt(r2)
print 'Train set: R**2:', r2, ' R:', r
if sf_pickle:
return self.save(sf_pickle)
else:
return self.save('NNScore.pickle')
def train(self, sf_pickle = ''):
# load precomputed descriptors and target values
self.train_descs = np.loadtxt(dirname(__file__) + '/NNScore/train_descs.csv', delimiter=',', dtype=float)
self.train_target = np.loadtxt(dirname(__file__) + '/NNScore/train_target.csv', delimiter=',', dtype=float)
self.test_descs = np.loadtxt(dirname(__file__) + '/NNScore/test_descs.csv', delimiter=',', dtype=float)
self.test_target = np.loadtxt(dirname(__file__) + '/NNScore/test_target.csv', delimiter=',', dtype=float)
n_dim = (~((self.train_descs == 0).all(axis=0) | (self.train_descs.min(axis=0) == self.train_descs.max(axis=0)))).sum()
# number of network to sample; original implementation did 1000, but 100 give results good enough.
n = 1000
# make nets reproducible
random_seed(1)
seeds = np.random.randint(123456789, size=n)
trained_nets = Parallel(n_jobs=self.n_jobs, verbose=10)(delayed(_parallel_helper)(neuralnetwork([n_dim,5,1], random_state=seeds[i]), 'fit', self.train_descs, self.train_target, neural_network__train_alg='tnc', neural_network__maxfun=10000) for i in xrange(n))
# get 20 best
best_idx = np.array([net.score(self.test_descs, self.test_target.flatten()) for net in trained_nets]).argsort()[::-1][:20]
self.model = ensemble_model([trained_nets[i] for i in best_idx])
r2 = self.model.score(self.test_descs, self.test_target)
r = np.sqrt(r2)
print 'Test set: R**2:', r2, ' R:', r
r2 = self.model.score(self.train_descs, self.train_target)
r = np.sqrt(r2)
print 'Train set: R**2:', r2, ' R:', r
if sf_pickle:
return self.save(sf_pickle)
else:
return self.save('NNScore.pickle')
def train(self, home_dir=None, sf_pickle='', pdbbind_version=2007):
if not home_dir:
home_dir = dirname(__file__) + '/NNScore'
# load precomputed descriptors and target values
self.train_descs = np.loadtxt(home_dir + '/train_descs_pdbbind%i.csv' %
(pdbbind_version),
delimiter=',',
dtype=float)
self.train_target = np.loadtxt(
home_dir + '/train_target_pdbbind%i.csv' % (pdbbind_version),
delimiter=',',
dtype=float)
self.test_descs = np.loadtxt(home_dir + '/test_descs_pdbbind%i.csv' %
(pdbbind_version),
delimiter=',',
dtype=float)
self.test_target = np.loadtxt(home_dir + '/test_target_pdbbind%i.csv' %
(pdbbind_version),
delimiter=',',
dtype=float)
n_dim = (~((self.train_descs == 0).all(axis=0) |
(self.train_descs.min(axis=0)
== self.train_descs.max(axis=0)))).sum()
# number of network to sample; original implementation did 1000, but 100 give results good enough.
n = 1000
# make nets reproducible
random_seed(1)
seeds = np.random.randint(123456789, size=n)
trained_nets = Parallel(n_jobs=self.n_jobs, verbose=10)(
delayed(_parallel_helper)(neuralnetwork(
(5, ),
random_state=seeds[i],
activation='logistic',
solver='lbfgs',
max_iter=10000,
), 'fit', self.train_descs, self.train_target) for i in range(n))
# get 20 best
best_idx = np.array([
net.score(self.test_descs, self.test_target.flatten())
for net in trained_nets
]).argsort()[::-1][:20]
self.model = ensemble_model([trained_nets[i] for i in best_idx])
r2 = self.model.score(self.test_descs, self.test_target)
r = np.sqrt(r2)
print('Test set: R**2:', r2, ' R:', r, file=sys.stderr)
r2 = self.model.score(self.train_descs, self.train_target)
r = np.sqrt(r2)
print('Train set: R**2:', r2, ' R:', r, file=sys.stderr)
if sf_pickle:
return self.save(sf_pickle)
else:
return self.save('NNScore_pdbbind%i.pickle' % (pdbbind_version))
def train(self, home_dir=None, sf_pickle=None, pdbbind_version=2016):
if not home_dir:
home_dir = dirname(__file__) + '/NNScore'
desc_path = path_join(home_dir, 'nnscore_descs.csv')
super(nnscore, self)._load_pdbbind_desc(desc_path,
pdbbind_version=2016)
# number of network to sample; original implementation did 1000, but
# 100 give results good enough.
# TODO: allow user to specify number of nets?
n = 1000
# make nets reproducible
random_seed(1)
seeds = np.random.randint(123456789, size=n)
trained_nets = (Parallel(
n_jobs=self.n_jobs, verbose=10,
pre_dispatch='all')(delayed(method_caller)(neuralnetwork(
(5, ),
random_state=seeds[i],
activation='logistic',
solver='lbfgs',
max_iter=10000), 'fit', self.train_descs, self.train_target)
for i in range(n)))
# get 20 best
trained_nets.sort(
key=lambda n: n.score(self.test_descs, self.test_target.flatten()))
self.model = ensemble_model(trained_nets[-20:])
error = rmse(self.model.predict(self.test_descs), self.test_target)
r2 = self.model.score(self.test_descs, self.test_target)
r = np.sqrt(r2)
print('Test set:',
'R**2: %.4f' % r2,
'R: %.4f' % r,
'RMSE: %.4f' % error,
sep='\t',
file=sys.stderr)
error = rmse(self.model.predict(self.train_descs), self.train_target)
r2 = self.model.score(self.train_descs, self.train_target)
r = np.sqrt(r2)
print('Train set:',
'R**2: %.4f' % r2,
'R: %.4f' % r,
'RMSE: %.4f' % error,
sep='\t',
file=sys.stderr)
if sf_pickle is None:
return self.save('NNScore_pdbbind%i.pickle' % (pdbbind_version))
else:
return self.save(sf_pickle)
def train(self, home_dir=None, sf_pickle=None, pdbbind_version=2016):
if not home_dir:
home_dir = dirname(__file__) + '/NNScore'
desc_path = path_join(home_dir, 'nnscore_descs.csv')
super(nnscore, self)._load_pdbbind_desc(desc_path,
pdbbind_version=pdbbind_version)
# number of network to sample; original implementation did 1000, but
# 100 give results good enough.
# TODO: allow user to specify number of nets?
n = 1000
# make nets reproducible
random_seed(1)
seeds = np.random.randint(123456789, size=n)
trained_nets = (
Parallel(n_jobs=self.n_jobs, verbose=10, pre_dispatch='all')(
delayed(method_caller)(
neuralnetwork((5,),
random_state=seeds[i],
activation='logistic',
solver='lbfgs',
max_iter=10000),
'fit',
self.train_descs,
self.train_target)
for i in range(n)))
# get 20 best
trained_nets.sort(key=lambda n: n.score(self.test_descs,
self.test_target.flatten()))
self.model = ensemble_model(trained_nets[-20:])
sets = [
('Test', self.model.predict(self.test_descs), self.test_target),
('Train', self.model.predict(self.train_descs), self.train_target)]
for name, pred, target in sets:
if len(target) < 3:
print('There are less than 3 values to predict, skipping.', file=sys.stderr)
continue
print('%s set:' % name,
'R2_score: %.4f' % r2_score(target, pred),
'Rp: %.4f' % pearsonr(target, pred)[0],
'RMSE: %.4f' % rmse(target, pred),
'SD: %.4f' % standard_deviation_error(target, pred),
sep='\t', file=sys.stderr)
if sf_pickle is None:
return self.save('NNScore_pdbbind%i.pickle' % (pdbbind_version))
else:
return self.save(sf_pickle)
def train(self, home_dir=None, sf_pickle=None, pdbbind_version=2016):
if not home_dir:
home_dir = dirname(__file__) + '/NNScore'
desc_path = path_join(home_dir, 'nnscore_descs.csv')
super(nnscore, self)._load_pdbbind_desc(desc_path,
pdbbind_version=pdbbind_version)
# number of network to sample; original implementation did 1000, but
# 100 give results good enough.
# TODO: allow user to specify number of nets?
n = 1000
# make nets reproducible
random_seed(1)
seeds = np.random.randint(123456789, size=n)
trained_nets = (
Parallel(n_jobs=self.n_jobs, verbose=10, pre_dispatch='all')(
delayed(method_caller)(
neuralnetwork((5,),
random_state=seeds[i],
activation='logistic',
solver='lbfgs',
max_iter=10000),
'fit',
self.train_descs,
self.train_target)
for i in range(n)))
# get 20 best
trained_nets.sort(key=lambda n: n.score(self.test_descs,
self.test_target.flatten()))
self.model = ensemble_model(trained_nets[-20:])
sets = [
('Test', self.model.predict(self.test_descs), self.test_target),
('Train', self.model.predict(self.train_descs), self.train_target)]
for name, pred, target in sets:
print('%s set:' % name,
'R2_score: %.4f' % r2_score(target, pred),
'Rp: %.4f' % pearsonr(target, pred)[0],
'RMSE: %.4f' % rmse(target, pred),
'SD: %.4f' % standard_deviation_error(target, pred),
sep='\t', file=sys.stderr)
if sf_pickle is None:
return self.save('NNScore_pdbbind%i.pickle' % (pdbbind_version))
else:
return self.save(sf_pickle)
def train(self, home_dir=None, sf_pickle='', pdbbind_version=2016):
if not home_dir:
home_dir = dirname(__file__) + '/NNScore'
# load precomputed descriptors and target values
df = pd.read_csv(home_dir + '/nnscore_descs.csv', index_col='pdbid')
train_set = 'refined'
test_set = 'core'
cols = list(map(str, range(len(self.descriptor_generator))))
self.train_descs = (
df[(df['%i_%s' % (pdbbind_version, train_set)]
& ~df['%i_%s' % (pdbbind_version, test_set)])][cols].values)
self.train_target = (
df[(df['%i_%s' % (pdbbind_version, train_set)]
& ~df['%i_%s' % (pdbbind_version, test_set)])]['act'].values)
self.test_descs = df[df['%i_%s' %
(pdbbind_version, test_set)]][cols].values
self.test_target = df[df['%i_%s' %
(pdbbind_version, test_set)]]['act'].values
# number of network to sample; original implementation did 1000, but 100 give results good enough.
n = 1000
# make nets reproducible
random_seed(1)
seeds = np.random.randint(123456789, size=n)
trained_nets = (Parallel(n_jobs=self.n_jobs, verbose=10)(
delayed(_parallel_helper)(neuralnetwork(
(5, ),
random_state=seeds[i],
activation='logistic',
solver='lbfgs',
max_iter=10000,
), 'fit', self.train_descs, self.train_target) for i in range(n)))
# get 20 best
best_idx = np.array([
net.score(self.test_descs, self.test_target.flatten())
for net in trained_nets
]).argsort()[::-1][:20]
self.model = ensemble_model([trained_nets[i] for i in best_idx])
error = rmse(self.model.predict(self.test_descs), self.test_target)
r2 = self.model.score(self.test_descs, self.test_target)
r = np.sqrt(r2)
print('Test set:',
'R**2: %.4f' % r2,
'R: %.4f' % r,
'RMSE: %.4f' % error,
sep='\t',
file=sys.stderr)
error = rmse(self.model.predict(self.train_descs), self.train_target)
r2 = self.model.score(self.train_descs, self.train_target)
r = np.sqrt(r2)
print('Train set:',
'R**2: %.4f' % r2,
'R: %.4f' % r,
'RMSE: %.4f' % error,
sep='\t',
file=sys.stderr)
if sf_pickle:
return self.save(sf_pickle)
else:
return self.save('NNScore_pdbbind%i.pickle' % (pdbbind_version))
