LibSVM LING572 Fei Xia Week 9: 3/4/08 1. Documentation The libSVM directory on Patas: /NLP_TOOLS/svm/libsvm/latest/

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Presentation transcript:

libSVM LING572 Fei Xia Week 9: 3/4/08 1

Documentation The libSVM directory on Patas: /NLP_TOOLS/svm/libsvm/latest/ Under the libSVM directory: – README – FAQ.html – A practical guide to support vector classification A practical guide to support vector classification – LIBSVM : a library for support vector machines LIBSVM : a library for support vector machines

Main commands svm-scale: scaling the data svm-train: training svm-predict: decoding

svm-scale svm-scale -l -1 -u 1 -s range_file training_data > training_data.scale svm-scale -r range_file test_data > test_data.scale Scale feature values to [-1, 1] or [0,1] No need to scale the data for this assignment.

svm-train svm-train [options] training_data model_file Options: -t [0-3]: kernel type -g gamma: used in polynomial, RBF, sigmoid -d degree: used in polynomial -r coef0: used in polynomial, sigmoid Type “svm-train” to see options

Kernel functions -t kernel_type : set type of kernel function (default 2) 0: linear: u'*v 1: polynomial: (gamma*u'*v + coef0)^degree 2: RBF: exp(-gamma*|u-v|^2) 3: sigmoid: tanh(gamma*u'*v + coef0)

svm-predict svm-predict test_data model_file output_file The output-file lists only the system prediction. You will implement your own decoder in Hw8.

The format of training/test data Sparse format: no need to include features with value zero. Mallet format: instanceName truelabel f1 v1 f2 v2 ….. libSVM format: truelabel_idx feat_idx1:v1 feat_idx2:v2 …. (feat_idx, v) is sorted according to feat_idx in ascending order. Ex: 1 20:1 23:0.5 34:-1 …

Handling a multi-class task One-against-one (a.k.a. pair-wise) Build a classifier for every (c m, c n ) pairs – There are C(C-1)/2 classifiers The classifiers are stored in a compact format.

The format of the model file svm_type c_svc kernel_type rbf gamma 0.5 nr_class 3 total_sv 2698 rho label nr_sv SV :1 1:1 2:1 3:1 4:1 5:1 … …

The rho array It contains C(C-1)/2 elements, one per classifier 0 vs. 1, 0 vs. 2, …, 0 vs. C-1, 1 vs. 2, 1 vs. 3, …, 1 vs. C-1 2 vs. 3, …, 2 vs. C-1 … C-2 vs. C-1

The format of the SV line Each line includes C-1 weights (i.e., y i ® i ) followed by the vector. w1 w2 … w C-1 f1:v1 f2:v2 …. Suppose the current vector belongs to the i-th class, the weights are ordered as follows: 0 vs. i 1 vs. i 2 vs i …. i-1 vs i i vs. i+1 i vs i+2 i vs i+3 …. i vs C-1

Classifying an instance x

Hw8

Binary classification task: – Q1: run libSVM – Q2: build a SVM decoder for two-class model Multi-class task: – Q3: run libSVM – Q4: build a SVM decoder for multi-class model You can use Q4 for Q2. 15

The sys_output file in Q4 TrueLabel sysLabel 0:1 f(x) 0:2 f(x) … ci=cnt … 0 0 0: : : c0=2 c2= : : : c2=2 c1=1 … For Q2, you can use the same format or TrueLabel sysLabel f(x)