#english
English - Causative Structures
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Causative structures (have/get + something + past participle) describe situations when you arrange or cause someone else to do something for you.
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present simple - I have/get my hair cut every month
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present continuous - She’s getting her house painted now
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past simple - He had his car fixed yesterday
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present perfect - they have had their house renovated recently
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future - we will have our car repaired tomorrow
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have: neutral, formal, emphasizes arrangement
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get: more informal, emphasizes persuading/convincing someone
Python
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Decorators execute some process withe the decorated function
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Decorators are synthetic sugars and it usually change one function to other
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Decorators are executed in
import time or when modules are being imported
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Usually the decorators are implemented in one module and used in another module
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global can used to a variable outside scope when there is a variable with the same name inside local scope
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nonlocal are free variables, neither local neither global
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functools.cache is a type of decorator that store values from the functions using the same paramters
Recommender Systems
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Collaborative filtering is used to recommend new items to users
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It uses users interactions with items
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The calculation of similarity is based on the similar user profiles
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Content based filtering can recommend items as well
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The commendation is based on the similarity between items
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It is necessary to collect items features. For example: for movies - actors, year, producer, music
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How to deal with cold start for both?
sources
