Keyphrases
- maximum likelihood estimation
- language model
- expectation maximization
- mixture model
- multivariate gaussian
- mixture of gaussians
- probabilistic model
- em algorithm
- maximum likelihood
- language modeling
- n gram
- speech recognition
- document retrieval
- parameter estimation
- information retrieval
- language modelling
- query expansion
- test collection
- gaussian mixture model
- smoothing methods
- probability distribution
- retrieval model
- context sensitive
- density function
- pseudo relevance feedback
- density estimation
- document ranking
- statistical language models
- gaussian mixture
- relevance model
- language models for information retrieval
- dirichlet distribution
- probability density function
- data mining
- covariance matrix