How can I implement active learning techniques for improving the performance of the system over time?

In the context of data science, you can implement active learning in a recommendation system for a particular streaming platform by using techniques like uncertainty sampling or query. Here is how you can do so:-

Uncertainty sampling

You can calculate the uncertainty scores for the items in your dataset by using a model, such as collaborative filtering or a content-based model.

You can select the items with the highest score and even present them to the users for labeling.

You can update the model by using the labeled data and repeat the process iteratively.

# Example code for uncertainty sampling in Python using sci-kit-learn

From sklearn.ensemble import RandomForestClassifier

From sklearn.model_selection import train_test_split

# Assuming you have a dataset X_train, y_train

  X_train, X_pool, y_train, y_pool = train_test_split(X, y, test_size=0.8, random_state=42)

# Train an initial model

Model = RandomForestClassifier()

Model.fit(X_train, y_train)

# Calculate uncertainty scores

  Uncertainty_scores = model.predict_proba(X_pool).max(axis=1)

# Select items with the highest uncertainty scores for labeling

  Top_uncertain_indices = uncertainty_scores.argsort()[-10:][::-1]

Items_to_label = X_pool[top_uncertain_indices]

# User labels items, update dataset, and retrain the model

Query by committee

You can train multiple models on the subsets of the data or even use different algorithms.

You can use the models so that you can make predictions on unlabeled data.

You can select the items where the models disagree the most and present them to the users for labeling.

# Example code for query by committee in Python

From sklearn.ensemble import RandomForestClassifier

From sklearn.linear_model import LogisticRegression

From sklearn.model_selection import train_test_split

# Assuming you have a dataset X_train, y_train

  X_train, X_pool, y_train, y_pool = train_test_split(X, y, test_size=0.8, random_state=42)

# Train multiple models

Model1 = RandomForestClassifier()

Model2 = LogisticRegression()

Model1.fit(X_train, y_train)

Model2.fit(X_train, y_train)

# Make predictions

Predictions1 = model1.predict(X_pool)

Predictions2 = model2.predict(X_pool)

# Calculate disagreement between models

  Disagreement = (predictions1 != predictions2)

# Select items with highest disagreement for labeling

  Items_to_label = X_pool[disagreement]

# User labels items, update dataset, and potentially retrains the models