Natural Language Processing - Automatic Summarization - Query Parsers (And other parsers) - Minimum edit distance - spelling correction ( autocomplete) - Disclosure analysis - Named entity recognition - NLTK - P-O-S tagging - Sentiment analysis - Word sense disambiguation

Information Retrieval and Extraction - Precision, Recall, etc - Search engines -

Machine learning - Python & R - Supervised learning - ANN - Bayesian - Classification - Naive Bayes, Linear, Logistic, Perceptron etc - SVMs - Regression - kNN - Decision Trees - Hidden Markov Models - ANOVA(t-test) - Random forest - Unsupervised learning - EM algorithm - ANN - Asociation Rule - Apriori - Clustering - K Means - Semi Supervised - Reinforcement learning - Deep Learning