def test_warm_start(self, ):
n_features = 2
n = 100
random_state = 123
X, y, _ = self._get_regression_data(n, n_features, random_state)
for inference in [True, False]:
forest = RegressionForest(n_estimators=4,
inference=inference,
warm_start=True,
random_state=123).fit(X, y)
forest.n_estimators = 8
forest.fit(X, y)
pred1 = forest.predict(X)
inds1 = forest.get_subsample_inds()
tree_states1 = [t.random_state for t in forest]
forest = RegressionForest(n_estimators=8,
inference=inference,
warm_start=True,
random_state=123).fit(X, y)
pred2 = forest.predict(X)
inds2 = forest.get_subsample_inds()
tree_states2 = [t.random_state for t in forest]
np.testing.assert_allclose(pred1, pred2)
np.testing.assert_allclose(inds1, inds2)
np.testing.assert_allclose(tree_states1, tree_states2)
return
def test_projection(self, ):
# test the projection functionality of forests
# test that the estimator calcualtes var correctly
np.set_printoptions(precision=10, suppress=True)
config = self._get_base_config()
config['honest'] = True
config['max_depth'] = 0
config['inference'] = True
config['n_estimators'] = 100
config['subforest_size'] = 2
config['max_samples'] = .5
config['n_jobs'] = 1
n_features = 2
# test api
n = 100
random_state = 123
X, y, truth = self._get_regression_data(n, n_features, random_state)
forest = RegressionForest(**config).fit(X, y)
mean, var = forest.predict_and_var(X)
mean = mean.flatten()
var = var.flatten()
y = np.hstack([y, y])
truth = np.hstack([truth, truth])
forest = RegressionForest(**config).fit(X, y)
projector = np.ones((X.shape[0], 2)) / 2.0
mean_proj, var_proj = forest.predict_projection_and_var(X, projector)
np.testing.assert_array_equal(mean_proj, mean)
np.testing.assert_array_equal(var_proj, var)
np.testing.assert_array_equal(
var_proj, forest.predict_projection_var(X, projector))
np.testing.assert_array_equal(mean_proj,
forest.predict_projection(X, projector))
return
def test_var(self,):
# test that the estimator calcualtes var correctly
config = self._get_base_config()
config['honest'] = True
config['max_depth'] = 0
config['inference'] = True
config['n_estimators'] = 1000
config['subforest_size'] = 2
config['max_samples'] = .5
config['n_jobs'] = 1
n_features = 2
# test api
n = 100
random_state = 123
X, y, truth = self._get_regression_data(n, n_features, random_state)
forest = RegressionForest(**config).fit(X, y)
alpha = .1
mean, var = forest.predict_and_var(X)
lb = scipy.stats.norm.ppf(alpha / 2, loc=mean[:, 0], scale=np.sqrt(var[:, 0, 0])).reshape(-1, 1)
ub = scipy.stats.norm.ppf(1 - alpha / 2, loc=mean[:, 0], scale=np.sqrt(var[:, 0, 0])).reshape(-1, 1)
np.testing.assert_allclose(var, forest.predict_var(X))
lbtest, ubtest = forest.predict_interval(X, alpha=alpha)
np.testing.assert_allclose(lb, lbtest)
np.testing.assert_allclose(ub, ubtest)
meantest, lbtest, ubtest = forest.predict(X, interval=True, alpha=alpha)
np.testing.assert_allclose(mean, meantest)
np.testing.assert_allclose(lb, lbtest)
np.testing.assert_allclose(ub, ubtest)
np.testing.assert_allclose(np.sqrt(var[:, 0, 0]), forest.prediction_stderr(X)[:, 0])
# test accuracy
for n in [10, 100, 1000, 10000]:
random_state = 123
X, y, truth = self._get_regression_data(n, n_features, random_state)
forest = RegressionForest(**config).fit(X, y)
our_mean, our_var = forest.predict_and_var(X[:1])
true_mean, true_var = np.mean(y), np.var(y) / y.shape[0]
np.testing.assert_allclose(our_mean, true_mean, atol=0.05)
np.testing.assert_allclose(our_var, true_var, atol=0.05, rtol=.1)
for n, our_thr, true_thr in [(1000, .5, .25), (10000, .05, .05)]:
random_state = 123
config['max_depth'] = 1
X, y, truth = self._get_step_regression_data(n, n_features, random_state)
forest = RegressionForest(**config).fit(X, y)
posX = X[X[:, 0] > our_thr]
negX = X[X[:, 0] < -our_thr]
our_pos_mean, our_pos_var = forest.predict_and_var(posX)
our_neg_mean, our_neg_var = forest.predict_and_var(negX)
pos = X[:, 0] > true_thr
true_pos_mean, true_pos_var = np.mean(y[pos]), np.var(y[pos]) / y[pos].shape[0]
neg = X[:, 0] < -true_thr
true_neg_mean, true_neg_var = np.mean(y[neg]), np.var(y[neg]) / y[neg].shape[0]
np.testing.assert_allclose(our_pos_mean, true_pos_mean, atol=0.07)
np.testing.assert_allclose(our_pos_var, true_pos_var, atol=0.0, rtol=.25)
np.testing.assert_allclose(our_neg_mean, true_neg_mean, atol=0.07)
np.testing.assert_allclose(our_neg_var, true_neg_var, atol=0.0, rtol=.25)
return
def test_non_standard_input(self,):
# test that the estimator accepts lists, tuples and pandas data frames
n_features = 2
n = 100
random_state = 123
X, y, truth = self._get_regression_data(n, n_features, random_state)
forest = RegressionForest(n_estimators=20, n_jobs=1, random_state=123).fit(X, y)
pred = forest.predict(X)
forest = RegressionForest(n_estimators=20, n_jobs=1, random_state=123).fit(tuple(X), tuple(y))
np.testing.assert_allclose(pred, forest.predict(tuple(X)))
forest = RegressionForest(n_estimators=20, n_jobs=1, random_state=123).fit(list(X), list(y))
np.testing.assert_allclose(pred, forest.predict(list(X)))
forest = RegressionForest(n_estimators=20, n_jobs=1, random_state=123).fit(pd.DataFrame(X), pd.DataFrame(y))
np.testing.assert_allclose(pred, forest.predict(pd.DataFrame(X)))
forest = RegressionForest(n_estimators=20, n_jobs=1, random_state=123).fit(
pd.DataFrame(X), pd.Series(y.ravel()))
np.testing.assert_allclose(pred, forest.predict(pd.DataFrame(X)))
return
def test_pickling(self,):
n_features = 2
n = 10
random_state = 123
X, y, _ = self._get_regression_data(n, n_features, random_state)
forest = RegressionForest(n_estimators=4, warm_start=True, random_state=123).fit(X, y)
forest.n_estimators = 8
forest.fit(X, y)
pred1 = forest.predict(X)
joblib.dump(forest, 'forest.jbl')
loaded_forest = joblib.load('forest.jbl')
np.testing.assert_equal(loaded_forest.n_estimators, forest.n_estimators)
np.testing.assert_allclose(loaded_forest.predict(X), pred1)
def test_raise_exceptions(self, ):
# test that we raise errors in mishandled situations.
n_features = 2
n = 10
random_state = 123
X, y, truth = self._get_regression_data(n, n_features, random_state)
with np.testing.assert_raises(ValueError):
forest = RegressionForest(n_estimators=20).fit(X, y[:4])
with np.testing.assert_raises(ValueError):
forest = RegressionForest(n_estimators=20,
subforest_size=3).fit(X, y)
with np.testing.assert_raises(ValueError):
forest = RegressionForest(n_estimators=20,
inference=True,
max_samples=.6).fit(X, y)
with np.testing.assert_raises(ValueError):
forest = RegressionForest(n_estimators=20,
max_samples=20).fit(X, y)
with np.testing.assert_raises(ValueError):
forest = RegressionForest(n_estimators=20,
max_samples=1.2).fit(X, y)
with np.testing.assert_raises(ValueError):
forest = RegressionForest(n_estimators=4,
warm_start=True,
inference=True).fit(X, y)
forest.inference = False
forest.n_estimators = 8
forest.fit(X, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4,
criterion='peculiar').fit(X, y, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4, max_depth=-1).fit(X, y, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4,
min_samples_split=-1).fit(X, y, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4,
min_samples_leaf=-1).fit(X, y, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4,
min_weight_fraction_leaf=-1.0).fit(X, y, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4,
min_var_fraction_leaf=-1.0).fit(X, y, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4, max_features=10).fit(X, y, y)
with np.testing.assert_raises(ValueError):
forest = CausalForest(n_estimators=4,
min_balancedness_tol=.55).fit(X, y, y)
return
def monte_carlo():
n = 5000
d = 5
x_grid = np.linspace(-1, 1, 1000)
X_test = np.hstack(
[x_grid.reshape(-1, 1),
np.random.normal(size=(1000, d - 1))])
coverage = []
exp_dict = {'point': [], 'low': [], 'up': []}
for it in range(100):
print(it)
X = np.random.normal(0, 1, size=(n, d))
y = X[:, 0] + np.random.normal(size=(n, ))
est = RegressionForest(n_estimators=1000, verbose=1)
est.fit(X, y)
point = est.predict(X_test)
low, up = est.predict_interval(X_test, alpha=0.05)
coverage.append((low <= x_grid) & (x_grid <= up))
exp_dict['point'].append(point)
exp_dict['low'].append(low)
exp_dict['up'].append(up)
if not os.path.exists('figures'):
os.makedirs('figures')
if not os.path.exists(os.path.join("figures", 'honestforest')):
os.makedirs(os.path.join("figures", 'honestforest'))
plt.figure()
plt.plot(x_grid, np.mean(coverage, axis=0))
plt.savefig('figures/honestforest/coverage.png')
plt.figure()
plt.plot(x_grid,
np.sqrt(np.mean((np.array(exp_dict['point']) - x_grid)**2,
axis=0)),
label='RMSE')
plt.savefig('figures/honestforest/rmse.png')
plt.figure()
plt.plot(x_grid,
np.mean(np.array(exp_dict['up']) - np.array(exp_dict['low']),
axis=0),
label='length')
plt.savefig('figures/honestforest/length.png')
def test_regression_tree_internals(self):
base_config = self._get_base_config()
n, n_features = 10, 2
random_state = 123
X, y, truth = self._get_regression_data(n, n_features, random_state)
forest = RegressionForest(**base_config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature,
np.array([0, 0, -2, -2, 0, -2, -2]))
np.testing.assert_array_equal(
tree.threshold, np.array([4.5, 2.5, -2, -2, 7.5, -2, -2]))
np.testing.assert_array_almost_equal(
tree.value.flatten()[:3],
np.array([
np.mean(y),
np.mean(y[X[:, tree.feature[0]] < tree.threshold[0]]),
np.mean(y[(X[:, tree.feature[0]] < tree.threshold[0])
& (X[:, tree.feature[1]] < tree.threshold[1])])
]),
decimal=5)
np.testing.assert_array_almost_equal(tree.predict(X), y, decimal=5)
tree.predict_precond(X)
tree.predict_jac(X)
tree.predict_precond_and_jac(X)
less = X[:, tree.feature[0]] < tree.threshold[0]
# testing importances
feature_importances = np.zeros(X.shape[1])
feature_importances[0] = np.var(y)
np.testing.assert_array_almost_equal(
tree.compute_feature_importances(normalize=False),
feature_importances,
decimal=5)
feature_importances = np.zeros(X.shape[1])
feature_importances[0] = np.var(y) - np.var(y[less])
np.testing.assert_array_almost_equal(tree.compute_feature_importances(
normalize=False, max_depth=0),
feature_importances,
decimal=5)
feature_importances = np.zeros(X.shape[1])
feature_importances[0] = np.var(y) - np.var(
y[less]) + .5 * (np.var(y[less]))
np.testing.assert_array_almost_equal(tree.compute_feature_importances(
normalize=False, max_depth=1, depth_decay=1.0),
feature_importances,
decimal=5)
# testing heterogeneity importances
feature_importances = np.zeros(X.shape[1])
feature_importances[0] = 5 * 5 * (np.mean(y[less]) -
np.mean(y[~less]))**2 / 100
np.testing.assert_array_almost_equal(
tree.compute_feature_heterogeneity_importances(normalize=False,
max_depth=0),
feature_importances,
decimal=5)
feature_importances[0] += .5 * (2 * 2 * 3 * (1)**2 / 5) / 10
np.testing.assert_array_almost_equal(
tree.compute_feature_heterogeneity_importances(normalize=False,
max_depth=1,
depth_decay=1.0),
feature_importances,
decimal=5)
feature_importances[0] += .5 * (2 * 2 * 3 * (1)**2 / 5) / 10
np.testing.assert_array_almost_equal(
tree.compute_feature_heterogeneity_importances(normalize=False),
feature_importances,
decimal=5)
# Testing that all parameters do what they are supposed to
config = deepcopy(base_config)
config['min_samples_leaf'] = 5
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature, np.array([
0,
-2,
-2,
]))
np.testing.assert_array_equal(tree.threshold, np.array([4.5, -2, -2]))
config = deepcopy(base_config)
config['min_samples_split'] = 11
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature, np.array([-2]))
np.testing.assert_array_equal(tree.threshold, np.array([-2]))
np.testing.assert_array_almost_equal(tree.predict(X),
np.mean(y),
decimal=5)
np.testing.assert_array_almost_equal(tree.predict_full(X),
np.mean(y),
decimal=5)
config = deepcopy(base_config)
config['min_weight_fraction_leaf'] = .5
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature, np.array([
0,
-2,
-2,
]))
np.testing.assert_array_equal(tree.threshold, np.array([4.5, -2, -2]))
# testing predict, apply and decision path
less = X[:, tree.feature[0]] < tree.threshold[0]
y_pred = np.zeros((X.shape[0], 1))
y_pred[less] = np.mean(y[less])
y_pred[~less] = np.mean(y[~less])
np.testing.assert_array_almost_equal(tree.predict(X),
y_pred,
decimal=5)
np.testing.assert_array_almost_equal(tree.predict_full(X),
y_pred,
decimal=5)
decision_path = np.zeros((X.shape[0], len(tree.feature)))
decision_path[less, :] = np.array([1, 1, 0])
decision_path[~less, :] = np.array([1, 0, 1])
np.testing.assert_array_equal(
tree.decision_path(X).todense(), decision_path)
apply = np.zeros(X.shape[0])
apply[less] = 1
apply[~less] = 2
np.testing.assert_array_equal(tree.apply(X), apply)
feature_importances = np.zeros(X.shape[1])
feature_importances[0] = 1
np.testing.assert_array_equal(tree.compute_feature_importances(),
feature_importances)
config = deepcopy(base_config)
config['min_balancedness_tol'] = 0.
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature, np.array([
0,
-2,
-2,
]))
np.testing.assert_array_equal(tree.threshold, np.array([4.5, -2, -2]))
config = deepcopy(base_config)
config['min_balancedness_tol'] = 0.1
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature,
np.array([0, 0, -2, -2, 0, -2, -2]))
np.testing.assert_array_equal(
tree.threshold, np.array([4.5, 2.5, -2, -2, 7.5, -2, -2]))
config = deepcopy(base_config)
config['max_depth'] = 1
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature, np.array([
0,
-2,
-2,
]))
np.testing.assert_array_equal(tree.threshold, np.array([4.5, -2, -2]))
config = deepcopy(base_config)
config['min_impurity_decrease'] = 0.9999
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature, np.array([
0,
-2,
-2,
]))
np.testing.assert_array_equal(tree.threshold, np.array([4.5, -2, -2]))
config = deepcopy(base_config)
config['min_impurity_decrease'] = 1.0001
forest = RegressionForest(**config).fit(X, y)
tree = forest[0].tree_
np.testing.assert_array_equal(tree.feature, np.array([
-2,
]))
np.testing.assert_array_equal(tree.threshold, np.array([
-2,
]))