MPI stands for Moldflow Plastic Insight, which is a dataset consisting of more than 1 million images of physical 3D objects. The images have seven variation factors, such as the color, shape, size, and position of the objects. This dataset can be used to test representation learning algorithms in simulated and real environments.

The dataset has four subsets: Real world simple shapes (mpi3d_real), Realistic rendered images (mpi3d_realistic), Simplistic rendered images (mpi3d_toy), and Complex real world shapes (mpi3d_complex), the first three containing 1,036,800 images and the last containing 460,800 images.