Skip to main content

How to handle imbalanced data set in machine learning problem

TechniqueDescriptionReal-Life Example
Resampling- Oversampling: Increase the number of minority class samples. - Undersampling: Reduce the number of majority class samples.Example: In fraud detection, where fraudulent transactions are rare, you can oversample the minority class to balance the dataset. Conversely, you can undersample non-fraudulent transactions.
Synthetic DataGenerate synthetic samples for the minority class using techniques like SMOTE (Synthetic Minority Over-sampling Technique).Example: In medical diagnosis, when positive cases are scarce, generate synthetic data points to improve model accuracy.
Cost-Sensitive LearningModify the algorithm's objective function to penalize misclassification of the minority class more than the majority class.Example: In healthcare, misdiagnosing a rare disease may be costlier, so the algorithm can be tuned to minimize such errors.
Ensemble MethodsCombine predictions from multiple models to improve performance, e.g., Random Forests, AdaBoost, or XGBoost.Example: In credit scoring, ensemble methods can help balance recall and precision when dealing with rare default cases.
Anomaly DetectionTreat the minority class as anomalies and use anomaly detection algorithms like Isolation Forest or One-Class SVM.Example: In network security, detecting rare intrusions among legitimate traffic patterns.
Change the ThresholdAdjust the classification threshold to increase sensitivity or specificity based on the problem's requirements.Example: In email spam detection, lowering the threshold may increase the recall of spam emails.
Collect More DataSometimes, collecting more data for the minority class may be a practical solution if feasible.Example: In manufacturing, if defective products are rare, collecting more data on defect cases can help.
Labels:

Comments

Post a Comment

Popular posts from this blog

Error: could not find function "read.xlsx" while reading .xlsx file in R

Got this during the execution of following command in R > dat Error: could not find function "read.xlsx" Tried following command > install.packages("xlsx", dependencies = TRUE) Installing package into ‘C:/Users/amajumde/Documents/R/win-library/3.2’ (as ‘lib’ is unspecified) also installing the dependencies ‘rJava’, ‘xlsxjars’ trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.2/rJava_0.9-8.zip' Content type 'application/zip' length 766972 bytes (748 KB) downloaded 748 KB trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.2/xlsxjars_0.6.1.zip' Content type 'application/zip' length 9485170 bytes (9.0 MB) downloaded 9.0 MB trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.2/xlsx_0.5.7.zip' Content type 'application/zip' length 400968 bytes (391 KB) downloaded 391 KB package ‘rJava’ successfully unpacked and MD5 sums checked package ‘xlsxjars’ successfully unpacked ...
Post a Comment
Read more

What is the benefit of using Quantization in LLM

Quantization is a technique used in LLMs (Large Language Models) to reduce the memory requirements for storing and training the model parameters. It involves reducing the precision of the model weights from 32-bit floating-point numbers (FP32) to lower precision formats, such as 16-bit floating-point numbers (FP16) or 8-bit integers (INT8). Bottomline: You can use Quantization to reduce the memory footprint off the model during the training. The usage of quantization in LLMs offers several benefits: Memory Reduction: By reducing the precision of the model weights, quantization significantly reduces the memory footprint required to store the parameters. This is particularly important for LLMs, which can have billions or even trillions of parameters. Quantization allows these models to fit within the memory constraints of GPUs or other hardware accelerators. Training Efficiency: Quantization can also improve the training efficiency of LLMs. Lower precision formats require fewer computati...
Post a Comment
Read more

What is Tensor Parallelism and relationship between Buffer and GPU

  Tensor Parallelism in GPU Tensor parallelism is a technique used to distribute the computation of large tensor operations across multiple GPUs or multiple cores within a GPU .   It is an essential method for improving the performance and scalability of deep learning models, particularly when dealing with very large models that cannot fit into the memory of a single GPU. Key Concepts Tensor Operations : Tensors are multidimensional arrays used extensively in deep learning. Common tensor operations include matrix multiplication, convolution, and element-wise operations. Parallelism : Parallelism involves dividing a task into smaller sub-tasks that can be executed simultaneously. This approach leverages the parallel processing capabilities of GPUs to speed up computations. How Tensor Parallelism Works Splitting Tensors : The core idea of tensor parallelism is to split large tensors into smaller chunks that can be processed in parallel. Each chunk is assigned to a different GP...
Post a Comment
Read more