Add Dementia prediction

[PadmalathaKasireddy]

Description:

This pull request introduces a machine learning model to Dementia prediction using longitudinal MRI data. Here's a quick rundown:

• Data Preparation:
  • Loaded and preprocessed two datasets: oasis_cross-sectional.csv and oasis_longitudinal.csv.
  • Handled missing values and encoded categorical columns.
• EDA:
  • Visualized the distribution of the target variable 'CDR' and explored feature correlations.
• Modeling:
  • Trained five models: RandomForestClassifier, LogisticRegression, SVM, GradientBoostingClassifier, MLPClassifier.
  • Evaluated models on accuracy, ROC AUC, and classification report.
• Model Selection:
  • Chose GradientBoostingClassifier as the final model due to its superior performance.
    
• Evaluation:
  • Plotted ROC curve and confusion matrix for further assessment.
    
    

@sanjay-kv , Please review this and provide me with any suggestions.
Thank you.

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