snorkel.map.LambdaMapper¶
-
class
snorkel.map.
LambdaMapper
(name, f, pre=None, memoize=False)[source]¶ Bases:
snorkel.map.core.BaseMapper
Define a mapper from a function.
Convenience class for mappers that execute a simple function with no set up. The function should map from an input data point to a new data point directly, unlike
Mapper.run
. The original data point will not be updated, so in-place operations are safe.- Parameters
name (
str
) – Name of mapperf (
Callable
[[Any
],Optional
[Any
]]) – Function executing the mapping operationpre (
Optional
[List
[BaseMapper
]]) – Mappers to run before this mapper is executedmemoize (
bool
) – Memoize mapper outputs?
-
__init__
(name, f, pre=None, memoize=False)[source]¶ Initialize self. See help(type(self)) for accurate signature.
- Return type
None
Methods
__init__
(name, f[, pre, memoize])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