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Added num_residuals abstract method to residual fns #268

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Added num_residuals abstract method to residual fns #268

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4 changes: 4 additions & 0 deletions bqskit/ir/opt/cost/residual.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,10 @@ class ResidualsFunction(CostFunction):
def get_residuals(self, params: RealVector) -> npt.NDArray[np.float64]:
"""Return the vector of residuals given the input parameters."""

@abc.abstractmethod
def num_residuals(self) -> int:
"""Return the number of residuals, should be nonnegative."""

def __call__( # type: ignore
self,
params: RealVector,
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