snorkel.map.BaseMapper¶
-
class
snorkel.map.
BaseMapper
(name, pre, memoize, memoize_key=None)[source]¶ Bases:
object
Base class for
Mapper
andLambdaMapper
.Implements nesting, memoization, and deep copy functionality. Used primarily for type checking.
- Parameters
name (
str
) – Name of the mapperpre (
List
[BaseMapper
]) – Mappers to run before this mapper is executedmemoize (
bool
) – Memoize mapper outputs?memoize_key (
Optional
[Callable
[[Any
],Hashable
]]) – Hashing function to handle the memoization (default to snorkel.map.core.get_hashable)
- Raises
NotImplementedError – Subclasses need to implement
_generate_mapped_data_point
-
__init__
(name, pre, memoize, memoize_key=None)[source]¶ Initialize self. See help(type(self)) for accurate signature.
- Return type
None
Methods
__init__
(name, pre, memoize[, memoize_key])Initialize self.
Reset the memoization cache.
-
__call__
(x)[source]¶ Run mapping function on input data point.
Deep copies the data point first so as not to make accidental in-place changes. If
memoize
is set toTrue
, an internal cache is checked for results. If no cached results are found, the computed results are added to the cache.- Parameters
x (
Any
) – Data point to run mapping function on- Returns
Mapped data point of same format but possibly different fields
- Return type
DataPoint