libpmk Samples: ETH-80

About

This data set, from the ETH CogVis project, contains images of apples, pears, tomatoes, cows, dogs, horses, cups, and cars.

Recent changes

2007-09-21: Updated version for libpmk-2.0 compability.
2007-05-02: Switched from global to input-specific pyramids.

Data files

ETH80_GridSIFT.psl - SIFT features sampled uniformly on a grid (i.e., no interest operator).
ETH80_GridSIFT_PCA10.psl - Same as above, but reduced to 10 dimensions.
ETH80_labels.txt - Labels for the images, in a format readable by this code.

Source files

libpmk-eth.tar.gz - Two source files and a Makefile. This code will make a vocabulary-guided pyramid match kernel and will report the leave-one-out performance of a one-vs-rest SVM classifier. This means that all 5 images of one particular object are used as testing and the remaining 79 images are used as training. Compiles with both libpmk-1.x and 2.x.

Installation

You will need to modify the Makefile first. There are two lines that need to be changed:

LIBPMK_OBJ_PATH = /path/to/objs
LIBPMK_INC_PATH = /path/to/inc

The paths should point to the location of the libpmk objects (libpmk.o and libpmk_util.o) and the source tree, respectively. In most cases this will just be wherever you unpacked libpmk (e.g., /path/to/libpmk-1.0). After you edit the Makefile, type make. There is only one executable.

Usage

The executable, eth-experiment.out, takes four arguments:

Path to the data file
Number of levels in the vocabulary tree
Branch factor of the vocabulary tree
Path to the label file

Here is an example command line that will run an experiment, creating a vocabulary tree 3 levels deep with a branch factor 11:

./eth-experiment.out /path/to/ETH80_GridSIFT.psl 3 11 /path/to/ETH80_labels.txt

Example output:

Reading /afs/csail.mit.edu/u/j/jjl/data/eth/ethGridPCASIFTptsets.bin
Running hierarchical clustering
Making pyramids
Computing kernel matrix
Average accuracy: 0.847500

« Back to libpmk homepage