# Copyright (c) 2025 zfit
from __future__ import annotations
import typing
from collections.abc import Callable, Iterable
if typing.TYPE_CHECKING:
import zfit # noqa: F401
import tensorflow as tf
import zfit.z.numpy as znp
from zfit._interfaces import ZfitFunc
from ..core.basefunc import BaseFuncV1
from ..core.basemodel import SimpleModelSubclassMixin
from ..core.space import supports
from ..models.basefunctor import FunctorMixin
from ..util import ztyping
from ..util.container import convert_to_container
[docs]
class SimpleFuncV1(BaseFuncV1):
def __init__(
self,
obs: ztyping.ObsTypeInput,
func: Callable,
name: str = "Function",
**params,
):
"""Create a simple function out of of `func` with the observables `obs` depending on `parameters`.
Args:
func:
obs:
name:
**params: The parameters as keyword arguments. E.g. `mu=Parameter(...)`
"""
super().__init__(name=name, obs=obs, params=params)
self._value_func = self._check_input_x_function(func)
def _func(self, x):
try:
return self._value_func(x)
except TypeError: # self requested, TODO maybe check signature?
return self._value_func(self, x)
class BaseFunctorFuncV1(FunctorMixin, BaseFuncV1):
def __init__(self, funcs, name="BaseFunctorFunc", params=None, **kwargs):
funcs = convert_to_container(funcs)
if params is None:
params = {}
# for func in funcs:
# params.update(func.params)
self.funcs = funcs
super().__init__(name=name, models=self.funcs, params=params, **kwargs)
self._models = self.funcs
[docs]
class SumFunc(BaseFunctorFuncV1):
def __init__(
self,
funcs: Iterable[ZfitFunc],
obs: ztyping.ObsTypeInput = None,
name: str = "SumFunc",
**kwargs,
):
super().__init__(funcs=funcs, obs=obs, name=name, **kwargs)
def _func(self, x):
# sum_funcs = tf.add_n([func.value(x) for func in self.funcs])
funcs = [func.func(x) for func in self.funcs]
return tf.math.accumulate_n(funcs)
@supports()
def _analytic_integrate(self, limits, norm):
# below may raises AnalyticIntegralNotImplementedError, that's fine. We don't wanna catch that.
integrals = [func.analytic_integrate(limits=limits, norm=norm) for func in self.funcs]
return tf.math.accumulate_n(integrals)
[docs]
class ProdFunc(BaseFunctorFuncV1):
def __init__(
self,
funcs: Iterable[ZfitFunc],
obs: ztyping.ObsTypeInput = None,
name: str = "SumFunc",
**kwargs,
):
super().__init__(funcs=funcs, obs=obs, name=name, **kwargs)
def _func(self, x):
funcs = [func.func(x) for func in self.funcs]
return znp.prod(funcs, axis=0)
class ZFuncV1(SimpleModelSubclassMixin, BaseFuncV1):
def __init__(self, obs: ztyping.ObsTypeInput, name: str = "ZFunc", **params):
super().__init__(obs=obs, name=name, **params)
def __init_subclass__(cls, **kwargs):
super().__init_subclass__(**kwargs)
cls._check_simple_model_subclass()
