Sami Liedes questions

• Why are almost all cosine similarities positive between word or document vectors in gensim doc2vec?
• Is it possible to efficiently look ahead more than one Char in Attoparsec?
• Indexing numpy array by a numpy array of coordinates
• C++11 constructor inheritance and constructors with no parameters
• Is there ever a valid reason to not return *this from copy assignment operator? [duplicate]
• Can a Perl/Java/etc regular expression be written to match decimal (non-)prime numbers?

Sami Liedes answers