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All three ideas are implemented in a unified active and semi-supervised regression framework with ability to perform transfer learning , by exploiting the underlying geometric structure of crowd patterns via manifold analysis .
 unified active and semi-supervised regression framework, transfer learning; geometric structure of crowd patterns, unified active and semi-supervised regression framework; manifold analysis, geometric structure of crowd patterns
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 unified active and semi-supervised regression framework, transfer learning; geometric structure of crowd patterns, unified active and semi-supervised regression framework; manifold analysis, geometric structure of crowd patterns