def train_pipeline(df, pipe, clf_params, folds=10):
"""
trains the pipeline by the given classifier and predefined dimension reducer parameters.
:return: tuple of best estimator and best parameters
"""
features, target = split_features_labels(df)
# params to tune, reducers: pca, rfe and kbest
max_n = features.columns.size
params = create_pipeline_params(clf_params, max_n)
# use stratified splits
folder = StratifiedShuffleSplit(folds, test_size=.3, train_size=.7)
folder.random_state = random_state
# use f1 scoring to train combined precision and recall metrics
grid = GridSearchCV(pipe,
cv=folder,
n_jobs=4,
param_grid=params,
scoring='f1')
grid.fit(features, target)
return [grid.best_estimator_, grid.best_params_]
def run(
word_params: Optional["CNNParams"],
char_params: Optional["CNNParams"],
training_sizes: List[int],
window_sizes: List[Tuple[int, int]],
k: int = 5,
nocluster_dropout: float = 0.5,
kmeans_path: str = "../clustered",
gmm_path: str = "../clustered_gmm",
num_clusters: int = 10,
num_clusters_gmm: int = 10,
use_cluster_cnn: bool = False,
use_only_clusters: bool = False,
use_bow: bool = False,
) -> Tuple[Results, Results]:
if not (word_params or char_params):
print("Need at least one of {word_params, char_params")
return Results(None, None, None), Results(None, None, None)
both_models = word_params and char_params
baseline = defaultdict(dict)
dbscan = defaultdict(dict)
gmm = defaultdict(dict)
char_baseline = defaultdict(dict)
char_dbscan = defaultdict(dict)
char_gmm = defaultdict(dict)
if use_cluster_cnn:
def fn(w, n):
return lambda r: CNNClusterLabels(r, w, n, word_params.dropout)
elif use_only_clusters:
def fn(w, n):
return lambda r: OnlyClusterLabels(r, n * (sum(w) + 1), word_params.dropout)
else:
def fn(w, n):
return lambda r: CategoricalClusterLabels(r, n * (sum(w) + 1), word_params.dropout)
for training_size in training_sizes:
for window_size in window_sizes:
optim_fn = lambda p: torch.optim.Adam(p)
model_fns = []
if nocluster_dropout >= 0:
model_fns.append(lambda r: NoClusterLabels(r, nocluster_dropout))
if word_params:
model_fns += [
fn(window_size, num_clusters),
fn(window_size, num_clusters_gmm),
]
if nocluster_dropout >= 0:
model_fns.append(lambda r: NoClusterLabels(r, nocluster_dropout))
if char_params:
model_fns += [
fn(window_size, num_clusters),
fn(window_size, num_clusters_gmm),
]
dataset, validset, testset = load_dataset(
kmeans_path, gmm_path, num_clusters, num_clusters_gmm, window_size[0], window_size[1], old_test=True
)
splitter = StratifiedShuffleSplit(
n_splits=k,
train_size=training_size,
test_size=None,
random_state=100,
)
params_list = []
multiplier = 3 if nocluster_dropout >= 0 else 2
params_list += ([word_params] * multiplier) if word_params else []
params_list += ([char_params] * multiplier) if char_params else []
use_dist_list: List[bool]
if nocluster_dropout >= 0:
use_dist_list = [False, False, True] * (2 if both_models else 1)
else:
use_dist_list = [False, True] * (2 if both_models else 1)
splitter.random_state = 100
if use_bow:
values = cross_val_bow(k, splitter, dataset, testset=testset)
else:
values = cross_val(
k,
splitter,
model_fns,
use_dist_list,
optim_fn,
dataset,
params=params_list,
early_stopping=3,
validation_set=validset,
batch_size=128,
testset=testset,
)
result_order = []
if word_params:
if nocluster_dropout >= 0:
result_order.append(baseline)
result_order += [dbscan, gmm]
if char_params:
if nocluster_dropout >= 0:
result_order.append(char_baseline)
result_order += [char_dbscan, char_gmm]
if use_bow:
# special case, override the order
result_order = [baseline]
num_iter = len(values[0])
assert(num_iter == len(result_order))
for i, var in enumerate(result_order):
var[window_size][training_size] = [v[i] for v in values]
return (
Results(baseline, dbscan, gmm),
Results(char_baseline, char_dbscan, char_gmm),
)
