lale.lib.rasl.map module

class lale.lib.rasl.map.Map(*, columns=[], remainder='drop')

Bases: PlannedIndividualOp

Relational algebra map operator.

This documentation is auto-generated from JSON schemas.

Parameters

• columns (union type, optional, not for optimizer, default []) –

  Mappings for producing output columns.

  • dict

    Dictionary of output column names and mapping expressions.

  • or array of items : expression

    List of mapping expressions. The output column name is determined by a heuristic based on the input column name and the transformation function.

  • or callable, not for optimizer

    A callable which, when given the input data, returns either a list or dictionary of mapping expressions, as above.

• remainder (union type, optional, not for optimizer, default 'drop') –

  Transformation for the remaining columns.

  • ’passthrough’ or ‘drop’

  • or operator

    Mapping expression.

fit(X, y=None, **fit_params)

Train the operator.

Note: The fit method is not available until this operator is trainable.

Once this method is available, it will have the following signature:

Parameters

X (union type) –

The outer array is over rows.

• Any

• or array

  • items : array of items : Any

    The inner array is over columns.

transform(X, y=None)

Transform the data.

Note: The transform method is not available until this operator is trained.

Once this method is available, it will have the following signature:

Parameters

X (union type) –

The outer array is over rows.

• Any

• or array

  • items : array of items : Any

    The inner array is over columns.

Returns

result – The outer array is over rows.

• array

  • items : array of items : Any

    The inner array is over columns.

• or Any

Return type

union type