Reducing the Cost of Breaking Audio CAPTCHAs by Active and Semi-supervised Learning.
Malte DarnstädtHendrik MeutznerDorothea KolossaPublished in: ICMLA (2014)
Keyphrases
- semi supervised learning
- semi supervised
- unlabeled data
- labeled data
- supervised learning
- semi supervised classification
- unsupervised learning
- co training
- machine learning
- multimedia
- active learning
- labeled examples
- learning problems
- label propagation
- training data
- learning models
- transfer learning
- labeled and unlabeled data
- graph construction
- semi supervised learning methods
- graph based semi supervised learning
- regularization framework
- semi supervised learning algorithms
- manifold regularization
- learning tasks
- data sets
- multi view
- object recognition
- reinforcement learning