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    A definition to where a specific piece of data can be found. E.g: A database table, a file, a web service, etc. | 
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| Function | join | 
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| Function | join | 
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| Function | model | 
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| Variable | logger | 
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    def join_asof_source(source: 
  CodableBatchDataSource, left_request: RetrievalRequest, view: Any, left_on: list[ str] | None = None, right_on: list[ str] | None = None) -> JoinAsofDataSource:
    
      
      (source)
    
    
      
      
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    def join_source(source: 
  CodableBatchDataSource, view: Any, on_left: str | FeatureFactory | list[ str] | list[ FeatureFactory] | None = None, on_right: str | FeatureFactory | list[ str] | list[ FeatureFactory] | None = None, how: Literal[ 'inner',  'left',  'outer'] = 'inner', left_request: RetrievalRequest | None = None) -> JoinDataSource:
    
      
      (source)
    
    
      
      
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    def model_prediction_instance_source(model: 
  Any) -> tuple[ CodableBatchDataSource,  RetrievalRequest] | Exception:
    
      
      (source)
    
    
      
      
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    def resolve_keys(keys: 
  str | FeatureFactory | list[ str] | list[ FeatureFactory]) -> list[ str]:
    
      
      (source)
    
    
      
      
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  Undocumented