ignite/handlers/param_scheduler.py [1162:1205]:
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        if not isinstance(milestones_values, Sequence):
            raise TypeError(
                f"Argument milestones_values should be a list or tuple, but given {type(milestones_values)}"
            )
        if len(milestones_values) < 1:
            raise ValueError(
                f"Argument milestones_values should be with at least one value, but given {milestones_values}"
            )

        values = []  # type: List[float]
        milestones = []  # type: List[int]
        for pair in milestones_values:
            if not isinstance(pair, tuple) or len(pair) != 2:
                raise ValueError("Argument milestones_values should be a list of pairs (milestone, param_value)")
            if not isinstance(pair[0], numbers.Integral):
                raise TypeError(f"Value of a milestone should be integer, but given {type(pair[0])}")
            if len(milestones) > 0 and pair[0] < milestones[-1]:
                raise ValueError(
                    f"Milestones should be increasing integers, but given {pair[0]} is smaller "
                    f"than the previous milestone {milestones[-1]}"
                )
            milestones.append(pair[0])
            values.append(pair[1])

        self.values = values
        self.milestones = milestones
        self._index = 0
        self._state_attrs += ["values", "milestones", "_index"]

    def _get_start_end(self) -> Tuple[int, int, float, float]:
        if self.milestones[0] > self.event_index:
            return self.event_index - 1, self.event_index, self.values[0], self.values[0]
        elif self.milestones[-1] <= self.event_index:
            return (self.event_index, self.event_index + 1, self.values[-1], self.values[-1])
        elif self.milestones[self._index] <= self.event_index < self.milestones[self._index + 1]:
            return (
                self.milestones[self._index],
                self.milestones[self._index + 1],
                self.values[self._index],
                self.values[self._index + 1],
            )
        else:
            self._index += 1
            return self._get_start_end()
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ignite/handlers/state_param_scheduler.py [269:312]:
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        if not isinstance(milestones_values, Sequence):
            raise TypeError(
                f"Argument milestones_values should be a list or tuple, but given {type(milestones_values)}"
            )
        if len(milestones_values) < 1:
            raise ValueError(
                f"Argument milestones_values should be with at least one value, but given {milestones_values}"
            )

        values = []  # type: List[float]
        milestones = []  # type: List[int]
        for pair in milestones_values:
            if not isinstance(pair, tuple) or len(pair) != 2:
                raise ValueError("Argument milestones_values should be a list of pairs (milestone, param_value)")
            if not isinstance(pair[0], numbers.Integral):
                raise TypeError(f"Value of a milestone should be integer, but given {type(pair[0])}")
            if len(milestones) > 0 and pair[0] < milestones[-1]:
                raise ValueError(
                    f"Milestones should be increasing integers, but given {pair[0]} is smaller "
                    f"than the previous milestone {milestones[-1]}"
                )
            milestones.append(pair[0])
            values.append(pair[1])

        self.values = values
        self.milestones = milestones
        self._index = 0
        self._state_attrs += ["values", "milestones", "_index"]

    def _get_start_end(self) -> Tuple[int, int, float, float]:
        if self.milestones[0] > self.event_index:
            return self.event_index - 1, self.event_index, self.values[0], self.values[0]
        elif self.milestones[-1] <= self.event_index:
            return (self.event_index, self.event_index + 1, self.values[-1], self.values[-1])
        elif self.milestones[self._index] <= self.event_index < self.milestones[self._index + 1]:
            return (
                self.milestones[self._index],
                self.milestones[self._index + 1],
                self.values[self._index],
                self.values[self._index + 1],
            )
        else:
            self._index += 1
            return self._get_start_end()
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