def test_exhaust_initial_calls(base_estimator):
# check a model is fitted and used to make suggestions after we added
# at least n_initial_points via tell()
opt = Optimizer([(-2.0, 2.0)], base_estimator, n_initial_points=2,
acq_optimizer="sampling", random_state=1)
x0 = opt.ask() # random point
x1 = opt.ask() # random point
assert x0 != x1
# first call to tell()
r1 = opt.tell(x1, 3.)
assert len(r1.models) == 0
x2 = opt.ask() # random point
assert x1 != x2
# second call to tell()
r2 = opt.tell(x2, 4.)
if base_estimator.lower() == 'dummy':
assert len(r2.models) == 0
else:
assert len(r2.models) == 1
# this is the first non-random point
x3 = opt.ask()
assert x2 != x3
x4 = opt.ask()
r3 = opt.tell(x3, 1.)
# no new information was added so should be the same, unless we are using
# the dummy estimator which will forever return random points and never
# fits any models
if base_estimator.lower() == 'dummy':
assert x3 != x4
assert len(r3.models) == 0
else:
assert x3 == x4
assert len(r3.models) == 2
def test_exhaust_initial_calls(base_estimator):
# check a model is fitted and used to make suggestions after we added
# at least n_initial_points via tell()
opt = Optimizer([(-2.0, 2.0)], base_estimator, n_initial_points=2,
acq_optimizer="sampling", random_state=1)
x0 = opt.ask() # random point
x1 = opt.ask() # random point
assert x0 != x1
# first call to tell()
r1 = opt.tell(x1, 3.)
assert len(r1.models) == 0
x2 = opt.ask() # random point
assert x1 != x2
# second call to tell()
r2 = opt.tell(x2, 4.)
if base_estimator.lower() == 'dummy':
assert len(r2.models) == 0
else:
assert len(r2.models) == 1
# this is the first non-random point
x3 = opt.ask()
assert x2 != x3
x4 = opt.ask()
r3 = opt.tell(x3, 1.)
# no new information was added so should be the same, unless we are using
# the dummy estimator which will forever return random points and never
# fits any models
if base_estimator.lower() == 'dummy':
assert x3 != x4
assert len(r3.models) == 0
else:
assert x3 == x4
assert len(r3.models) == 2
def test_model_queue_size():
# Check if model_queue_size limits the model queue size
base_estimator = ExtraTreesRegressor(random_state=2)
opt = Optimizer([(-2.0, 2.0)], base_estimator, n_initial_points=1,
acq_optimizer="sampling", model_queue_size=2)
opt.run(bench1, n_iter=3)
# tell() computes the next point ready for the next call to ask()
# hence there are three after three iterations
assert_equal(len(opt.models), 2)
assert_equal(len(opt.Xi), 3)
opt.ask()
assert_equal(len(opt.models), 2)
assert_equal(len(opt.Xi), 3)
assert_equal(opt.ask(), opt.ask())
def test_multiple_asks():
# calling ask() multiple times without a tell() inbetween should
# be a "no op"
base_estimator = ExtraTreesRegressor(random_state=2)
opt = Optimizer([(-2.0, 2.0)], base_estimator, n_random_starts=1,
acq_optimizer="sampling")
opt.run(bench1, n_iter=3)
# tell() computes the next point ready for the next call to ask()
# hence there are three after three iterations
assert_equal(len(opt.models), 3)
assert_equal(len(opt.Xi), 3)
opt.ask()
assert_equal(len(opt.models), 3)
assert_equal(len(opt.Xi), 3)
assert_equal(opt.ask(), opt.ask())
def test_dict_list_space_representation():
"""
Tests whether the conversion of the dictionary and list representation
of a point from a search space works properly.
"""
chef_space = {
'Cooking time': (0, 1200), # in minutes
'Main ingredient': [
'cheese', 'cherimoya', 'chicken', 'chard', 'chocolate', 'chicory'
],
'Secondary ingredient': [
'love', 'passion', 'dedication'
],
'Cooking temperature': (-273.16, 10000.0) # in Celsius
}
opt = Optimizer(dimensions=dimensions_aslist(chef_space))
point = opt.ask()
# check if the back transformed point and original one are equivalent
assert_equal(
point,
point_aslist(chef_space, point_asdict(chef_space, point))
)
def test_multiple_asks():
# calling ask() multiple times without a tell() inbetween should
# be a "no op"
base_estimator = ExtraTreesRegressor(random_state=2)
opt = Optimizer([(-2.0, 2.0)], base_estimator, n_initial_points=1,
acq_optimizer="sampling")
opt.run(bench1, n_iter=3)
# tell() computes the next point ready for the next call to ask()
# hence there are three after three iterations
assert_equal(len(opt.models), 3)
assert_equal(len(opt.Xi), 3)
opt.ask()
assert_equal(len(opt.models), 3)
assert_equal(len(opt.Xi), 3)
assert_equal(opt.ask(), opt.ask())
def test_categorical_only2():
from numpy import linalg
from skopt.space import Categorical
from skopt.learning import GaussianProcessRegressor
space = [Categorical([1, 2, 3]), Categorical([4, 5, 6])]
opt = Optimizer(space,
base_estimator=GaussianProcessRegressor(alpha=1e-7),
acq_optimizer='lbfgs',
n_initial_points=10,
n_jobs=2)
next_x = opt.ask(n_points=4)
assert len(next_x) == 4
opt.tell(next_x, [linalg.norm(x) for x in next_x])
next_x = opt.ask(n_points=4)
assert len(next_x) == 4
opt.tell(next_x, [linalg.norm(x) for x in next_x])
next_x = opt.ask(n_points=4)
assert len(next_x) == 4
def test_acq_optimizer_with_time_api(base_estimator, acq_func):
opt = Optimizer([(-2.0, 2.0),], base_estimator=base_estimator,
acq_func=acq_func,
acq_optimizer="sampling", n_initial_points=2)
x1 = opt.ask()
opt.tell(x1, (bench1(x1), 1.0))
x2 = opt.ask()
res = opt.tell(x2, (bench1(x2), 2.0))
# x1 and x2 are random.
assert_true(x1 != x2)
assert_true(len(res.models) == 1)
assert_array_equal(res.func_vals.shape, (2,))
assert_array_equal(res.log_time.shape, (2,))
# x3 = opt.ask()
with pytest.raises(TypeError) as e:
opt.tell(x2, bench1(x2))
def test_acq_optimizer_with_time_api(base_estimator, acq_func):
opt = Optimizer([(-2.0, 2.0),], base_estimator=base_estimator,
acq_func=acq_func,
acq_optimizer="sampling", n_initial_points=2)
x1 = opt.ask()
opt.tell(x1, (bench1(x1), 1.0))
x2 = opt.ask()
res = opt.tell(x2, (bench1(x2), 2.0))
# x1 and x2 are random.
assert x1 != x2
assert len(res.models) == 1
assert_array_equal(res.func_vals.shape, (2,))
assert_array_equal(res.log_time.shape, (2,))
# x3 = opt.ask()
with pytest.raises(TypeError) as e:
opt.tell(x2, bench1(x2))
def test_categorical_only():
from skopt.space import Categorical
cat1 = Categorical([2, 3, 4, 5, 6, 7, 8, 9, 10, 11])
cat2 = Categorical([2, 3, 4, 5, 6, 7, 8, 9, 10, 11])
opt = Optimizer([cat1, cat2])
for n in range(15):
x = opt.ask()
res = opt.tell(x, 12 * n)
assert len(res.x_iters) == 15
next_x = opt.ask(n_points=4)
assert len(next_x) == 4
cat3 = Categorical(["2", "3", "4", "5", "6", "7", "8", "9", "10", "11"])
cat4 = Categorical(["2", "3", "4", "5", "6", "7", "8", "9", "10", "11"])
opt = Optimizer([cat3, cat4])
for n in range(15):
x = opt.ask()
res = opt.tell(x, 12 * n)
assert len(res.x_iters) == 15
next_x = opt.ask(n_points=4)
assert len(next_x) == 4
def test_defaults_are_equivalent():
# check that the defaults of Optimizer reproduce the defaults of
# gp_minimize
space = [(-5., 10.), (0., 15.)]
opt = Optimizer(space, random_state=1)
for n in range(15):
x = opt.ask()
res_opt = opt.tell(x, branin(x))
res_min = gp_minimize(branin, space, n_calls=15, random_state=1)
assert res_min.space == res_opt.space
# tolerate small differences in the points sampled
assert np.allclose(res_min.x_iters, res_opt.x_iters, atol=1e-5)
assert np.allclose(res_min.x, res_opt.x, atol=1e-5)
def test_defaults_are_equivalent():
# check that the defaults of Optimizer reproduce the defaults of
# gp_minimize
space = [(-5., 10.), (0., 15.)]
opt = Optimizer(space, random_state=1)
for n in range(15):
x = opt.ask()
res_opt = opt.tell(x, branin(x))
res_min = gp_minimize(branin, space, n_calls=15, random_state=1)
assert res_min.space == res_opt.space
# tolerate small differences in the points sampled
assert np.allclose(res_min.x_iters, res_opt.x_iters, atol=1e-5)
assert np.allclose(res_min.x, res_opt.x, atol=1e-5)
def test_defaults_are_equivalent():
# check that the defaults of Optimizer reproduce the defaults of
# gp_minimize
space = [(-5., 10.), (0., 15.)]
#opt = Optimizer(space, 'ET', acq_func="EI", random_state=1)
opt = Optimizer(space, random_state=1)
for n in range(12):
x = opt.ask()
res_opt = opt.tell(x, branin(x))
#res_min = forest_minimize(branin, space, n_calls=12, random_state=1)
res_min = gp_minimize(branin, space, n_calls=12, random_state=1)
assert res_min.space == res_opt.space
# tolerate small differences in the points sampled
assert np.allclose(res_min.x_iters, res_opt.x_iters) #, atol=1e-5)
assert np.allclose(res_min.x, res_opt.x) #, atol=1e-5)
res_opt2 = opt.get_result()
assert np.allclose(res_min.x_iters, res_opt2.x_iters) # , atol=1e-5)
assert np.allclose(res_min.x, res_opt2.x) # , atol=1e-5)
def crossval_optimize_params(self,
opt_metric,
dataset,
cv=3,
opt_evals=50,
metrics=None,
verbose=False,
client=None,
workers=1,
timeout=100,
push_data=False,
data_check=True,
**kwargs):
"""Find optimal hyperparameters for all models
Args:
opt_metric (modelgym.metrics.Metric): metric to optimize
dataset (modelgym.utils.XYCDataset or None): dataset
cv (int or list of tuples of (XYCDataset, XYCDataset)): if int, then number of cross-validation folds or
cross-validation folds themselves otherwise.
opt_evals (int): number of cross-validation evaluations
metrics (list of modelgym.metrics.Metric, optional): additional metrics to evaluate
verbose (bool): Enable verbose output.
**kwargs: ignored
Note:
if cv is int, than dataset is split into cv parts for cross validation. Otherwise, cv folds are used.
"""
for name, model_space in self.model_spaces.items():
self.ind2names[name] = [param.name for param in model_space.space]
if metrics is None:
metrics = [opt_metric]
metrics.append(opt_metric)
if isinstance(dataset, Path) or isinstance(dataset, str):
if Path(dataset).expanduser().exists():
dataset = read_csv(dataset)
else:
raise FileNotFoundError(errno.ENOENT,
os.strerror(errno.ENOENT), dataset)
if isinstance(dataset, DataFrame):
if data_check:
if dataset.isnull().values.any():
raise ValueError("Dataset has NA values")
if "y" not in list(dataset.columns):
raise ValueError("Dataset doesn't have 'y' column")
logging.info("Dataset is ok")
else:
raise ValueError(
"Dataset should be DataFrame or path to the DataFrame")
data_path = ""
if client is None:
cv_pairs = cv_split(dataset, cv)
else:
with tempfile.NamedTemporaryFile() as temp:
dataset.to_csv(temp.name, index=False)
data_path = client.send_data(temp.name, push_data)
for name, model_space in self.model_spaces.items():
if client is None:
fn = lambda params: self._eval_fn(model_type=model_space.
model_class,
params=params,
cv=cv_pairs,
metrics=metrics,
verbose=verbose,
space_name=name)
best = self.optimizer(fn,
model_space.space,
n_calls=opt_evals,
n_random_starts=min(1, opt_evals))
else:
optimizer = Optimizer(dimensions=model_space.space,
random_state=1,
acq_func="gp_hedge")
for _ in log_progress(range(opt_evals), every=1):
x = optimizer.ask(
n_points=workers) # x is a list of n_points points
x_named = []
for params in x:
x_named.append({
self.ind2names[name][i]: params[i]
for i in range(len(params))
})
job_id_list = []
for model_params in x_named:
model_info = {
"models": [{
"type": model_space.model_class.__name__,
"params": model_params
}],
"metrics": [m.name for m in metrics[1:]],
"return_models":
False,
"cv":
cv
}
job_id_list.append(
client.eval_model(model_info=model_info,
data_path=data_path))
result_list = client.gather_results(job_id_list,
timeout=timeout)
if result_list == []:
continue
y_succeed = [
result for result in result_list if not result is None
]
x_succeed = [
x_dot for i, x_dot in enumerate(x)
if not result_list[i] is None
]
self.logs += y_succeed
for res in y_succeed:
if self.best_results.get(name) is None:
self.best_results[name] = {"output": {"loss": 0}}
if res.get("output").get(
"loss") < self.best_results.get(name).get(
"output").get("loss"):
self.best_results[name] = res
if y_succeed != []:
best = optimizer.tell(x_succeed, [
res.get("output").get("loss") for res in y_succeed
])
return self.best_results
# Search from 0.0 to 6.0
dimensions = ((0.0, 6.0), )
# Initialize estimator.
gpr = GaussianProcessRegressor(kernel=Matern(), noise=0.0)
optimizer = Optimizer(dimensions=dimensions,
base_estimator=gpr,
n_random_starts=0,
acq_func="LCB",
random_state=0)
# Tell some points to the optimizer and ask for the next point.
X = np.reshape(np.linspace(5.0, 6.0, 10), (-1, 1)).tolist()
y = [black_box(xi) for xi in X]
optimizer.tell(X, y)
x_cand = optimizer.ask()
y_cand = black_box(x_cand)
plot = plot_space(X, y, optimizer.models[-1], x_cand)
plot.show()
# Tell and ask again.
optimizer.tell(x_cand, y_cand)
X = X + [x_cand]
y = y + [y_cand]
x_cand = optimizer.ask()
y_cand = black_box(x_cand)
plot = plot_space(X, y, optimizer.models[-1], x_cand)
plot.show()
# Tell and ask again.
optimizer.tell(x_cand, y_cand)