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Cloud Computing for the Humanities Graham Wilcock University of Helsinki What is Cloud Computing? Run your app in the cloud Using somebody elses computers Computing resources on-demand Like electricity, or pizza delivery

  1. Cloud Computing for the Humanities Graham Wilcock University of Helsinki

  2. What is Cloud Computing? � ”Run your app in the cloud” � Using somebody else’s computers � Computing resources on-demand � Like electricity, or pizza delivery � Platform-as-a-Service (PaaS) � Example: Google App Engine Graham Wilcock Baltic HLT, Riga, 2010 2

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  4. Google App Engine � ”Run your web apps on Google’s infrastructure” � http://your-app-name.appspot.com � My web app is AELRED: � App Engine Language Resource Editions � First version: Jane Austen novels � http://aelred-austen.appspot.com Graham Wilcock Baltic HLT, Riga, 2010 4

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  17. Key Ideas: Easy, Big, Free � Easy: use Python � NLTK Natural Language Toolkit � Django HTML Template Engine � Big: Google’s scalable infrastructure � BigTable non-relational datastore � MapReduce data-intensive processing � Free: App Engine has free quotas � Only pay if high demand for app Graham Wilcock Baltic HLT, Riga, 2010 17

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  19. NLTK Natural Language Toolkit � Open source Python tools � Taggers, chunkers, parsers, classifiers ... � Many major corpora and resources � Brown Corpus, Penn Treebank, WordNet ... � Excellent free online textbook � Natural Language Processing with Python � Stephen Bird, Ewan Klein, Edward Loper Graham Wilcock Baltic HLT, Riga, 2010 19

  20. NLTK and App Engine � App Engine code must be pure Python � Normal ”import nltk” does not work � Some NLTK code is not pure Python � E.g. uses Numpy with C for speed � Use ”import aelred” instead � Aelred code is pure Python � Other customization, e.g. tokenization Graham Wilcock Baltic HLT, Riga, 2010 20

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  22. Django Web App Framework � Open source Python � Model-View-Controller design pattern � Models defined easily by Python classes � HTML Template Engine � Web pages generated using contexts � Excellent ”template inheritance” facility � Free online textbook � Django: The Book Graham Wilcock Baltic HLT, Riga, 2010 22

  23. Google BigTable Datastore � Non-relational database � Different thinking from SQL databases � Designed for massive scalability � My current way of using the datastore: � Serialize complex objects to YAML � Store/retrieve YAML as big text strings Graham Wilcock Baltic HLT, Riga, 2010 23

  24. MapReduce Algorithms � Data-intensive distributed processing � Different thinking from usual algorithms � Designed for massive scalability � My current way of using MapReduce: � Iterate over all entities in datastore � Delete entity, or update and save Graham Wilcock Baltic HLT, Riga, 2010 24

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