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diff --git a/drift_report.html b/drift_report.html
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+drift_report_20251031_164427.html
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diff --git a/drift_report_20251031_164427.html b/drift_report_20251031_164427.html
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diff --git a/iris_RandomForestClassifier.py b/iris_RandomForestClassifier.py
new file mode 100644
index 0000000..843ff09
--- /dev/null
+++ b/iris_RandomForestClassifier.py
@@ -0,0 +1,277 @@
+import mlflow
+import mlflow.sklearn
+import numpy as np
+import pandas as pd
+import re
+import os
+from datetime import datetime
+from sklearn.datasets import load_iris
+from sklearn.model_selection import train_test_split
+from sklearn.ensemble import RandomForestClassifier
+from sklearn.metrics import accuracy_score, precision_score, recall_score, f1_score
+from evidently.core.report import Report
+from evidently.presets import DataDriftPreset
+from evidently.metrics import DriftedColumnsCount
+
+print("=" * 60)
+print("Step 1: Setting up MLflow experiment")
+print("=" * 60)
+
+# Configure MLflow experiment
+mlflow.set_experiment("Iris_RandomForest_Drift_Detection")
+
+# Enable autologging for scikit-learn
+mlflow.sklearn.autolog()
+
+print("\nStep 2: Loading and preparing data")
+print("-" * 60)
+
+# Load data and prep
+iris_data = load_iris(as_frame=True)
+df = iris_data.frame
+X = df.drop(columns=["target"])
+y = df["target"]
+
+X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
+
+print(f"Training set size: {X_train.shape[0]} samples")
+print(f"Test set size: {X_test.shape[0]} samples")
+print(f"Number of features: {X_train.shape[1]}")
+
+print("\nStep 3: Training baseline model")
+print("-" * 60)
+
+# Start MLflow run for baseline model
+with mlflow.start_run(run_name="baseline_model") as run:
+ # Train
+ model = RandomForestClassifier(random_state=42, n_estimators=100)
+ model.fit(X_train, y_train)
+
+ # Predictions on test set
+ y_pred = model.predict(X_test)
+
+ # Calculate quality metrics
+ accuracy = accuracy_score(y_test, y_pred)
+ precision = precision_score(y_test, y_pred, average='weighted')
+ recall = recall_score(y_test, y_pred, average='weighted')
+ f1 = f1_score(y_test, y_pred, average='weighted')
+
+ # Log metrics
+ mlflow.log_metric("accuracy", accuracy)
+ mlflow.log_metric("precision", precision)
+ mlflow.log_metric("recall", recall)
+ mlflow.log_metric("f1_score", f1)
+
+ # Save model as artifact
+ mlflow.sklearn.log_model(model, "model")
+
+ print(f"\nBaseline model quality metrics:")
+ print(f" Accuracy: {accuracy:.4f}")
+ print(f" Precision: {precision:.4f}")
+ print(f" Recall: {recall:.4f}")
+ print(f" F1-Score: {f1:.4f}")
+ print(f"\nModel saved to MLflow run: {run.info.run_id}")
+
+ # Save baseline data for comparison
+ baseline_run_id = run.info.run_id
+
+print("\n" + "=" * 60)
+print("Step 4: Simulating feature drift")
+print("=" * 60)
+
+# Create drifted data with random intensity and features
+X_drifted = X_test.copy()
+
+# Randomly choose drift intensity: 'strong' (will trigger alert) or 'weak' (won't trigger alert)
+drift_intensity = np.random.choice(['strong', 'weak'], p=[0.5, 0.5])
+
+if drift_intensity == 'strong':
+ # Strong drift: apply to multiple features with high intensity (will trigger >30% alert)
+ # Randomly select 2-3 features out of 4 to drift
+ num_features_to_drift = np.random.randint(2, 4)
+ features_to_drift = np.random.choice(X_drifted.columns, size=num_features_to_drift, replace=False)
+ drift_loc = np.random.uniform(1.5, 2.5) # Higher drift magnitude
+ drift_scale = np.random.uniform(0.2, 0.4)
+ print(f"Applying STRONG drift (may trigger alert) to {num_features_to_drift} feature(s)")
+else:
+ # Weak drift: apply to fewer features with lower intensity (won't trigger alert)
+ num_features_to_drift = np.random.randint(1, 2)
+ features_to_drift = np.random.choice(X_drifted.columns, size=num_features_to_drift, replace=False)
+ drift_loc = np.random.uniform(0.3, 0.8) # Lower drift magnitude
+ drift_scale = np.random.uniform(0.1, 0.2)
+ print(f"Applying WEAK drift (should not trigger alert) to {num_features_to_drift} feature(s)")
+
+# Apply drift to selected features
+drift_info = {}
+for feature in features_to_drift:
+ old_mean = X_drifted[feature].mean()
+ X_drifted[feature] += np.random.normal(loc=drift_loc, scale=drift_scale, size=len(X_drifted))
+ new_mean = X_drifted[feature].mean()
+ drift_info[feature] = {
+ 'old_mean': old_mean,
+ 'new_mean': new_mean,
+ 'change': new_mean - old_mean
+ }
+ print(f" {feature}:")
+ print(f" Mean before: {old_mean:.4f}")
+ print(f" Mean after: {new_mean:.4f}")
+ print(f" Mean change: {new_mean - old_mean:.4f}")
+
+print("\n" + "=" * 60)
+print("Step 5: Drift detection with Evidently")
+print("=" * 60)
+
+# Define custom alert threshold (30% as specified in readme)
+DRIFT_ALERT_THRESHOLD = 0.3 # 30% threshold as specified in readme
+
+print("Generating drift report...")
+print(f"Drift alert threshold: {DRIFT_ALERT_THRESHOLD*100:.0f}% ({DRIFT_ALERT_THRESHOLD})")
+
+# Create report with Evidently's DataDriftPreset
+report = Report(metrics=[DataDriftPreset()])
+snapshot = report.run(current_data=X_drifted, reference_data=X_train)
+
+# Save HTML report locally with timestamp to ensure fresh generation
+timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+drift_report_path = f"drift_report_{timestamp}.html"
+
+# Remove old drift_report.html if exists to ensure fresh file
+old_report_path = "drift_report.html"
+if os.path.exists(old_report_path):
+ # Check if it's a symlink before removing
+ if os.path.islink(old_report_path):
+ os.unlink(old_report_path)
+ else:
+ os.remove(old_report_path)
+ print(f"Removed old report file: {old_report_path}")
+
+# Save new report
+snapshot.save_html(drift_report_path)
+print(f"Drift report saved to: {drift_report_path}")
+
+# Create symlink to standard name for easy access (Unix/Linux/Mac only)
+if os.name != 'nt': # Not Windows
+ try:
+ os.symlink(drift_report_path, old_report_path)
+ print(f"Created symlink: {old_report_path} -> {drift_report_path}")
+ except Exception as e:
+ print(f"Could not create symlink (using timestamped file directly): {e}")
+
+# Get metrics from report
+report_json = snapshot.dict()
+drift_metrics = {}
+drift_by_feature = {}
+
+# Extract drift information from report (new API structure)
+if 'metrics' in report_json:
+ # Get total number of features from the dataset
+ n_features = len(X_drifted.columns)
+ drift_metrics['n_features'] = n_features
+
+ # Extract DriftedColumnsCount metric
+ for metric in report_json['metrics']:
+ metric_id = str(metric.get('metric_id', ''))
+ value = metric.get('value', {})
+
+ # Get drift count and share
+ if 'DriftedColumnsCount' in metric_id:
+ if isinstance(value, dict):
+ drift_metrics['n_drifted_features'] = int(value.get('count', 0))
+ drift_metrics['drift_share'] = float(value.get('share', 0.0))
+
+ # Get drift for each feature
+ elif 'ValueDrift' in metric_id:
+ # Extract column name from metric_id like "ValueDrift(column=sepal length (cm))"
+ match = re.search(r'column=([^)]+)', metric_id)
+ if match:
+ feature_name = match.group(1)
+ # Value is p-value, lower means more drift
+ p_value = float(value) if not isinstance(value, dict) else 0.0
+ drift_detected = p_value < 0.05 # Standard threshold for drift detection
+ drift_by_feature[feature_name] = {
+ 'drift_score': p_value,
+ 'drift_detected': drift_detected
+ }
+
+# Display results
+print(f"\nDrift detection results:")
+print(f" Total features: {drift_metrics.get('n_features', 0)}")
+print(f" Drifted features: {drift_metrics.get('n_drifted_features', 0)}")
+if drift_metrics.get('n_features', 0) > 0:
+ drift_share = drift_metrics.get('drift_share', 0.0)
+ print(f" Drift percentage: {drift_share*100:.2f}%")
+
+ # Alert logic: alert if more than 30% of features exhibit significant drift
+ # Note: DRIFT_ALERT_THRESHOLD is defined above in Step 5
+ RED = '\033[91m'
+ GREEN = '\033[92m'
+ YELLOW = '\033[93m'
+ RESET = '\033[0m'
+
+ if drift_share > DRIFT_ALERT_THRESHOLD:
+ print(f"\n{RED}{'=' * 60}{RESET}")
+ print(f"{RED}ALERT: SIGNIFICANT DRIFT DETECTED!{RESET}")
+ print(f"{RED}{'=' * 60}{RESET}")
+ print(f"{YELLOW}WARNING: Drift share ({drift_share*100:.2f}%) exceeds alert threshold ({DRIFT_ALERT_THRESHOLD*100:.0f}%){RESET}")
+ print(f"{YELLOW}WARNING: Action required: Model performance may be degraded{RESET}")
+ print(f"{YELLOW}WARNING: Recommended: Trigger retraining or investigate data pipeline{RESET}")
+ print(f"{RED}{'=' * 60}{RESET}")
+ else:
+ print(f"\n{GREEN}OK: Drift share ({drift_share*100:.2f}%) is within acceptable range (< {DRIFT_ALERT_THRESHOLD*100:.0f}%){RESET}")
+
+if drift_by_feature:
+ print(f"\nFeature details:")
+ for feature_name, feature_info in drift_by_feature.items():
+ drift_score = feature_info.get('drift_score', 0)
+ drift_detected = feature_info.get('drift_detected', False)
+ status = "DRIFT DETECTED" if drift_detected else "No drift"
+ print(f" {feature_name}: {status} (p-value: {drift_score:.4f})")
+
+print("\n" + "=" * 60)
+print("Step 6: Logging drift report to MLflow")
+print("=" * 60)
+
+# Create new MLflow run for drift detection
+with mlflow.start_run(run_name="drift_detection") as drift_run:
+ # Log drift report as artifact
+ mlflow.log_artifact(drift_report_path, "drift_reports")
+
+ # Log drift metrics
+ # Note: DRIFT_ALERT_THRESHOLD is defined above in Step 5 (0.3 = 30%)
+ if drift_metrics:
+ mlflow.log_metric("n_features", drift_metrics.get('n_features', 0))
+ mlflow.log_metric("n_drifted_features", drift_metrics.get('n_drifted_features', 0))
+ drift_share = drift_metrics.get('drift_share', 0.0)
+ mlflow.log_metric("drift_share", drift_share)
+
+ # Log alert status
+ alert_triggered = drift_share > DRIFT_ALERT_THRESHOLD
+ mlflow.log_metric("alert_triggered", 1 if alert_triggered else 0)
+ mlflow.log_param("drift_alert_threshold", DRIFT_ALERT_THRESHOLD)
+ else:
+ drift_share = 0.0
+ alert_triggered = False
+
+ # Add tags
+ mlflow.set_tag("run_type", "drift_detection")
+ mlflow.set_tag("baseline_run_id", baseline_run_id)
+ mlflow.set_tag("drift_detected", str(drift_metrics.get('n_drifted_features', 0) > 0))
+ mlflow.set_tag("alert_triggered", str(alert_triggered))
+ mlflow.set_tag("simulated_drift_intensity", drift_intensity)
+ mlflow.set_tag("num_features_drifted", str(num_features_to_drift))
+ mlflow.set_tag("features_with_drift", ", ".join(features_to_drift))
+ if alert_triggered:
+ mlflow.set_tag("alert_reason", f"drift_share_{drift_share:.2f}_exceeds_30_percent")
+
+ print(f"Drift report logged to MLflow run: {drift_run.info.run_id}")
+ print(f"Artifacts available in MLflow UI")
+
+print("\n" + "=" * 60)
+print("Successfully completed!")
+print("=" * 60)
+print("\nNext steps:")
+print("1. Run 'mlflow ui' to view results in the web interface")
+print("2. Find the experiment 'Iris_RandomForest_Drift_Detection'")
+print("3. View drift report in Artifacts -> drift_reports")
+print("=" * 60)
+
diff --git a/mlruns/0/meta.yaml b/mlruns/0/meta.yaml
new file mode 100644
index 0000000..8ae515c
--- /dev/null
+++ b/mlruns/0/meta.yaml
@@ -0,0 +1,6 @@
+artifact_location: file:///Users/sergej/Library/Mobile%20Documents/com~apple~CloudDocs/DS_AI/module7/week38-MLFlow/lab-handle-drift-using-mlflow/mlruns/0
+creation_time: 1761752540127
+experiment_id: '0'
+last_update_time: 1761752540127
+lifecycle_stage: active
+name: Default
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/artifacts/drift_reports/drift_report_20251031_164427.html b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/artifacts/drift_reports/drift_report_20251031_164427.html
new file mode 100644
index 0000000..3c30ec2
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/artifacts/drift_reports/drift_report_20251031_164427.html
@@ -0,0 +1,844 @@
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diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/meta.yaml b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/meta.yaml
new file mode 100644
index 0000000..4243cec
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/meta.yaml
@@ -0,0 +1,14 @@
+artifact_uri: file:///Users/sergej/Library/Mobile%20Documents/com~apple~CloudDocs/DS_AI/module7/week38-MLFlow/lab-handle-drift-using-mlflow/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/artifacts
+end_time: 1761925467516
+entry_point_name: ''
+experiment_id: '746885822760801287'
+lifecycle_stage: active
+run_id: 0bed24f500044969972095e1807b0567
+run_name: drift_detection
+source_name: ''
+source_type: 4
+source_version: ''
+start_time: 1761925467419
+status: 3
+tags: []
+user_id: sergej
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/alert_triggered b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/alert_triggered
new file mode 100644
index 0000000..1dd729f
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/alert_triggered
@@ -0,0 +1 @@
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diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/drift_share b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/drift_share
new file mode 100644
index 0000000..8ee4a88
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/drift_share
@@ -0,0 +1 @@
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diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/n_drifted_features b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/n_drifted_features
new file mode 100644
index 0000000..a377170
--- /dev/null
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diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/n_features b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/metrics/n_features
new file mode 100644
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diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/params/drift_alert_threshold b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/params/drift_alert_threshold
new file mode 100644
index 0000000..1d71ef9
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/params/drift_alert_threshold
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+0.3
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/alert_reason b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/alert_reason
new file mode 100644
index 0000000..f525d6e
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/alert_reason
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\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/alert_triggered b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/alert_triggered
new file mode 100644
index 0000000..4791ed5
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/alert_triggered
@@ -0,0 +1 @@
+True
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/baseline_run_id b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/baseline_run_id
new file mode 100644
index 0000000..22428b0
--- /dev/null
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\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/drift_detected b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/drift_detected
new file mode 100644
index 0000000..4791ed5
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/drift_detected
@@ -0,0 +1 @@
+True
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/features_with_drift b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/features_with_drift
new file mode 100644
index 0000000..8a20029
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/features_with_drift
@@ -0,0 +1 @@
+sepal width (cm), sepal length (cm), petal width (cm)
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.runName b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.runName
new file mode 100644
index 0000000..ca14e23
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.runName
@@ -0,0 +1 @@
+drift_detection
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.git.commit b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.git.commit
new file mode 100644
index 0000000..1e7e82e
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.git.commit
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.name b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.name
new file mode 100644
index 0000000..fc22777
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.name
@@ -0,0 +1 @@
+/Users/sergej/Library/Mobile Documents/com~apple~CloudDocs/DS_AI/module7/week38-MLFlow/lab-handle-drift-using-mlflow/iris_RandomForestClassifier.py
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.type b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.type
new file mode 100644
index 0000000..0c2c1fe
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.source.type
@@ -0,0 +1 @@
+LOCAL
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.user b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.user
new file mode 100644
index 0000000..210ba1a
--- /dev/null
+++ b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/mlflow.user
@@ -0,0 +1 @@
+sergej
\ No newline at end of file
diff --git a/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/num_features_drifted b/mlruns/746885822760801287/0bed24f500044969972095e1807b0567/tags/num_features_drifted
new file mode 100644
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new file mode 100644
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