def labeling_evaluation(df_train, df_test, label_model):
lfs = [
LabelingFunction.lf_ind_keyword, LabelingFunction.lf_short,
LabelingFunction.lf_cmp_re, LabelingFunction.lf_industry_keyword,
LabelingFunction.lf_surname_re, LabelingFunction.industry_cls
]
applier = PandasLFApplier(lfs=lfs)
L_train = applier.apply(df=df_train)
L_test = applier.apply(df=df_test)
Y_test = df_test.label.values
analysis = LFAnalysis(L=L_train, lfs=lfs).lf_summary()
if label_model == "majority":
majority_model = MajorityLabelVoter()
preds_train = majority_model.predict(L=L_train)
majority_acc = majority_model.score(
L=L_test, Y=Y_test, tie_break_policy="random")["accuracy"]
print(f"{'Majority Vote Accuracy:':<25} {majority_acc * 100:.1f}%")
df_train_filtered, preds_train_filtered = filter_unlabeled_dataframe(
X=df_train, y=preds_train, L=L_train)
return df_train_filtered, preds_train_filtered, analysis
if label_model == "weighted":
label_model = LabelModel(cardinality=len(
[c for c in dir(Polarity) if not c.startswith("__")]),
verbose=True)
label_model.fit(L_train=L_train, n_epochs=500, log_freq=100, seed=123)
probs_train = label_model.predict_proba(L_train)
label_model_acc = label_model.score(
L=L_test, Y=Y_test, tie_break_policy="random")["accuracy"]
print(f"{'Label Model Accuracy:':<25} {label_model_acc * 100:.1f}%")
df_train_filtered, probs_train_filtered = filter_unlabeled_dataframe(
X=df_train, y=probs_train, L=L_train)
preds_train_filtered = probs_to_preds(probs_train_filtered)
return df_train_filtered, probs_train_filtered, preds_train_filtered, analysis
def model_analysis(label_model: LabelModel,
training_set: pd.DataFrame,
L_train: np.ndarray,
L_test: np.ndarray,
Y_test: np.ndarray,
lfs: list,
output_file="output") -> None:
# TODO: consider using **kwargs instead of this painful list of arguments
"""Output analysis for the label model to a file
:param label_model: The current label model which we want to output analysis for
:type label_model: LabelModel
:param training_set: A dataframe containing the training dataset
:type training_set: pd.DataFrame
:param L_train: The matrix of labels generated by the labeling functions on the training data
:type L_train: np.ndarray
:param L_test: The matrix of labels generated bt the labeling functions on the testing data
:type L_test: np.ndarray
:param Y_test: Gold labels associated with data points in L_test
:type Y_test: np.ndarray
:param lfs: List of labeling functions
:type lfs: list
:param output_file: A path where the output file should be writtent to, defaults to `PROJECT_ROOT/output`
:type output_file: str, optional
"""
Y_train = label_model.predict_proba(L=L_train)
Y_pred = label_model.predict(L=L_test, tie_break_policy="abstain")
lf_analysis_train = LFAnalysis(L=L_train, lfs=lfs).lf_summary()
# TODO: Write this df to a output file. Ask Jennifer about how to handle this
print(lf_analysis_train)
# build majority label voter model
majority_model = MajorityLabelVoter()
majority_acc = majority_model.score(L=L_test,
Y=Y_test,
tie_break_policy="abstain",
metrics=["f1", "accuracy"])
label_model_acc = label_model.score(L=L_test,
Y=Y_test,
tie_break_policy="abstain",
metrics=["f1", "accuracy"])
# get precision and recall scores
p_score = precision_score(y_true=Y_test, y_pred=Y_pred, average='weighted')
r_score = recall_score(y_true=Y_test,
y_pred=Y_pred,
average='weighted',
labels=np.unique(Y_pred))
# how many documents abstained
probs_train = majority_model.predict_proba(L=L_train)
df_train_filtered, probs_train_filtered = filter_unlabeled_dataframe(
X=training_set, y=probs_train, L=L_train)
# get number of false positives
buckets = get_label_buckets(Y_test, Y_pred)
true_positives, false_positives, true_negatives, false_negatives = (
buckets.get((1, 1)), buckets.get((1, 0)), buckets.get(
(0, 0)), buckets.get((0, 1)))
# write analysis to file
timestamp = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
with open(f"{'../output/logs/'}{output_file}_run_{timestamp}.txt",
"w") as output_file:
output_file.write(
f"{'Majority Vote Accuracy:':<25} {majority_acc['accuracy'] * 100:.2f}%"
)
output_file.write(
f"\n{'Majority Vote F1 Score:':<25} {majority_acc['f1'] * 100:.2f}%"
)
output_file.write(
f"\n{'Label Model Accuracy:':<25} {label_model_acc['accuracy'] * 100:.2f}%"
)
output_file.write(
f"\n{'Label Model F1 Score:':<25} {label_model_acc['f1'] * 100:.2f}%"
)
output_file.write(f"\n{'Precision Score:':<25} {p_score * 100:.2f}%")
output_file.write(f"\n{'Recall Score:':<25} {r_score * 100:.2f}%")
output_file.write(
f"\n{'Abstained Data Points:':<25} {len(df_train_filtered)}")
output_file.write(
f"\n{'True Positives:':<25} {len(true_positives) if true_positives is not None else 0}"
)
output_file.write(
f"\n{'False Positives:':<25} {len(false_positives) if false_positives is not None else 0}"
)
output_file.write(
f"\n{'False Negatives:':<25} {len(false_negatives) if false_negatives is not None else 0}"
)
output_file.write(
f"\n{'True Negatives:':<25} {len(true_negatives) if true_negatives is not None else 0}"
)
output_file.write(
f"\n{'Abstained Positives:':<25} {len(buckets[(1, -1)])}")
output_file.write(
f"\n{'Abstained Negatives:':<25} {len(buckets[(0, -1)])}")
L_train = applier.apply(df=X_train)
L_dev = applier.apply(df=X_dev)
print('fitting Label Model')
label_model = LabelModel(cardinality=config['cardinality'], verbose=True)
label_model.fit(L_train=L_train, n_epochs=500, log_freq=100, seed=123)
label_model_acc = label_model.score(L=L_dev,
Y=y_dev,
tie_break_policy="random")["accuracy"]
print(f'label model acc: {label_model_acc}')
print('fitting Majority Label Voter model')
majority_model = MajorityLabelVoter(cardinality=config['cardinality'])
# preds_train = majority_model.predict(L=L_train)
majority_acc = majority_model.score(L=L_dev,
Y=np.array(y_dev).reshape(-1, 1),
tie_break_policy="random")["accuracy"]
print(f'majority_label_acc: {majority_acc}')
log_metric('majority_label_acc', majority_acc)
log_metric('label_model_acc', label_model_acc)
probs_train = label_model.predict_proba(L=L_train)
df_train_filtered, probs_train_filtered = filter_unlabeled_dataframe(
X=X_train, y=probs_train, L=L_train)
print('setting up Label Model')
stop_words = config['stop_words']
custom_stop_words = text.ENGLISH_STOP_WORDS.union(stop_words)
# vectorizer = CountVectorizer(ngram_range=(1, 5))
vectorizer = TfidfVectorizer(stop_words=custom_stop_words).fit(
# summary statistics for the LFs
lf_summary = LFAnalysis(L=L_train, lfs=lfs).lf_summary()
print(lf_summary)
# take the majority vote on a per-data point basis
majority_model = MajorityLabelVoter()
preds_train = majority_model.predict(L=L_train)
# use LabelModel to produce training labels
label_model = LabelModel(cardinality=2, verbose=True)
label_model.fit(L_train=L_train, n_epochs=500, log_freq=100, seed=123)
# result using majority-vote model
Y_test = data_test.label.values
majority_acc = majority_model.score(L=L_test,
Y=Y_test,
tie_break_policy="random")["accuracy"]
print(f"{'Majority Vote Accuracy:':<25} {majority_acc * 100:.1f}%")
# results using label model
label_model_acc = label_model.score(L=L_test,
Y=Y_test,
tie_break_policy="random")["accuracy"]
print(f"{'Label Model Accuracy:':<25} {label_model_acc * 100:.1f}%")
# representing each data point using "bag of n-gram" feature
probs_train = label_model.predict_proba(L=L_train)
vectorizer = CountVectorizer(ngram_range=(1, 5))
X_train = vectorizer.fit_transform(data_train.text.tolist())
X_test = vectorizer.transform(data_test.text.tolist())
def majority_acc(line: np.ndarray, label_series: Series) -> float:
majority_model = MajorityLabelVoter()
maj_model_train_acc = majority_model.score(
L=line, Y=label_series.values, tie_break_policy="random")["accuracy"]
return maj_model_train_acc
def majority_acc(L: np.ndarray, df: pd.DataFrame) -> float:
majority_model = MajorityLabelVoter()
maj_model_train_acc = majority_model.score(
L=L, Y=df.label, tie_break_policy="random")["accuracy"]
return maj_model_train_acc
