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add a dependencies method to LambdaOp #498

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merged 1 commit into from
Dec 16, 2020
Merged

add a dependencies method to LambdaOp #498

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6 changes: 5 additions & 1 deletion nvtabular/ops/lambdaop.py
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Original file line number Diff line number Diff line change
Expand Up @@ -75,14 +75,15 @@ class LambdaOp(Operator):
Whether to replace existing columns or create new ones.
"""

def __init__(self, f):
def __init__(self, f, dependency=None):
super().__init__()
if f is None:
raise ValueError("f cannot be None. LambdaOp op applies f to dataframe")
self.f = f
self._param_count = len(signature(self.f).parameters)
if self._param_count not in (1, 2):
raise ValueError("lambda function must accept either one or two parameters")
self.dependency = dependency

@annotate("DFLambda_op", color="darkgreen", domain="nvt_python")
def transform(self, columns, gdf: cudf.DataFrame):
Expand All @@ -96,3 +97,6 @@ def transform(self, columns, gdf: cudf.DataFrame):
# shouldn't ever happen,
raise RuntimeError(f"unhandled lambda param count {self._param_count}")
return new_gdf

def dependencies(self):
return self.dependency