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landingai.timer

Timer class for timing code execution and reporting results.

Timer dataclass

Bases: ContextDecorator

Time your code using a class, context manager, or decorator. See below examples for usage. As a class: 

t = Timer(name="class")
t.start()
# Do something
t.stop()

As a context manager: 

with Timer(name="context manager"):
    # Do something

As a decorator: 

@Timer(name="decorator")
def stuff():
    # Do something

All the time values are stored in a global dictionary, accessible via the stats attribute. See the TimerStats class for more information.

Source code in landingai/timer.py 
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@dataclass
class Timer(ContextDecorator):
    """Time your code using a class, context manager, or decorator.
    See below examples for usage.
    As a class:
    ```
    t = Timer(name="class")
    t.start()
    # Do something
    t.stop()
    ```

    As a context manager:
    ```
    with Timer(name="context manager"):
        # Do something
    ```

    As a decorator:
    ```
    @Timer(name="decorator")
    def stuff():
        # Do something
    ```

    All the time values are stored in a global dictionary, accessible via the `stats` attribute.
    See the `TimerStats` class for more information.
    """

    # Global stats of all the timers
    stats: ClassVar[TimerStats] = TimerStats()
    # Instance attributes
    name: str = "default"
    text: str = (
        "Timer '{name}' finished. Elapsed time: {color}{:0.3f}{color_reset} seconds."
    )
    log_fn: Callable[[str], None] = logging.getLogger(__name__).info
    _elapsed_time: float = field(default=math.nan, init=False, repr=False)
    # Keep track of the start time for each thread and each timer (i.e. each function)
    _thread_local_data: threading.local = field(
        default=threading.local(), init=False, repr=False
    )

    def start(self) -> None:
        """Start a new timer."""
        if not hasattr(self._thread_local_data, "_start_time"):
            self._thread_local_data._start_time = {}
        if self.name in self._thread_local_data._start_time:
            raise ValueError("Timer is running. Use .stop() to stop it")
        self._thread_local_data._start_time[self.name] = time.perf_counter()

    def stop(self) -> float:
        """Stop the timer, and report the elapsed time."""
        if (
            not hasattr(self._thread_local_data, "_start_time")
            or self.name not in self._thread_local_data._start_time
        ):
            raise ValueError("Timer is not running. Use .start() to start it")

        # Calculate elapsed time
        self._elapsed_time = (
            time.perf_counter() - self._thread_local_data._start_time[self.name]
        )
        # Report elapsed time
        attributes = {
            "name": self.name,
            "milliseconds": self._elapsed_time * 1000,
            "seconds": self._elapsed_time,
            "minutes": self._elapsed_time / 60,
            "color": TextColor.BOLD_RED.value,
            "color_reset": TextColor.RESET.value,
        }
        text = self.text.format(self._elapsed_time, **attributes)
        self.log_fn(str(text))
        # Save stats
        Timer.stats.add(self.name, self._elapsed_time)

        del self._thread_local_data._start_time[self.name]

        return self._elapsed_time

    def __enter__(self) -> "Timer":
        """Start a new timer as a context manager."""
        self.start()
        return self

    def __exit__(self, *exc_info: Any) -> None:
        """Stop the context manager timer."""
        self.stop()

__enter__()

Start a new timer as a context manager.

Source code in landingai/timer.py 
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def __enter__(self) -> "Timer":
    """Start a new timer as a context manager."""
    self.start()
    return self

__exit__(*exc_info)

Stop the context manager timer.

Source code in landingai/timer.py 
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def __exit__(self, *exc_info: Any) -> None:
    """Stop the context manager timer."""
    self.stop()

start()

Start a new timer.

Source code in landingai/timer.py 
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def start(self) -> None:
    """Start a new timer."""
    if not hasattr(self._thread_local_data, "_start_time"):
        self._thread_local_data._start_time = {}
    if self.name in self._thread_local_data._start_time:
        raise ValueError("Timer is running. Use .stop() to stop it")
    self._thread_local_data._start_time[self.name] = time.perf_counter()

stop()

Stop the timer, and report the elapsed time.

Source code in landingai/timer.py 
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def stop(self) -> float:
    """Stop the timer, and report the elapsed time."""
    if (
        not hasattr(self._thread_local_data, "_start_time")
        or self.name not in self._thread_local_data._start_time
    ):
        raise ValueError("Timer is not running. Use .start() to start it")

    # Calculate elapsed time
    self._elapsed_time = (
        time.perf_counter() - self._thread_local_data._start_time[self.name]
    )
    # Report elapsed time
    attributes = {
        "name": self.name,
        "milliseconds": self._elapsed_time * 1000,
        "seconds": self._elapsed_time,
        "minutes": self._elapsed_time / 60,
        "color": TextColor.BOLD_RED.value,
        "color_reset": TextColor.RESET.value,
    }
    text = self.text.format(self._elapsed_time, **attributes)
    self.log_fn(str(text))
    # Save stats
    Timer.stats.add(self.name, self._elapsed_time)

    del self._thread_local_data._start_time[self.name]

    return self._elapsed_time

TimerStats

Custom dictionary that stores time values of different timers. For each timer, it stores a sequence of time duration values. Each sequence is limited to a maximum size to avoid memory issues.

Source code in landingai/timer.py 
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class TimerStats:
    """Custom dictionary that stores time values of different timers.
    For each timer, it stores a sequence of time duration values. Each sequence is limited to a maximum size to avoid memory issues.

    """

    def __init__(self, *args: Any, **kwargs: Any) -> None:
        """Add a private dictionary keeping track of all timings"""
        super().__init__(*args, **kwargs)
        self._timings: Dict[str, MutableSequence[float]] = defaultdict(
            partial(deque, maxlen=_MAX_SIZE)
        )

    def add(self, name: str, value: float) -> None:
        """Add a timing value to the given timer."""
        self._timings[name].append(value)

    def clear(self) -> None:
        """Clear timers."""
        self._timings.clear()

    def apply(self, func: Callable[[Sequence[float]], float], name: str) -> float:
        """Apply a function to the results of one named timer."""
        if name in self._timings:
            return func(self._timings[name])
        raise KeyError(name)

    def count(self, name: str) -> float:
        """Number of timings."""
        return self.apply(len, name=name)

    def total(self, name: str) -> float:
        """Total time for timers."""
        return self.apply(sum, name=name)

    def min(self, name: str) -> float:
        """Minimal value of timings."""
        return self.apply(lambda values: min(values or [0]), name=name)

    def max(self, name: str) -> float:
        """Maximal value of timings."""
        return self.apply(lambda values: max(values or [0]), name=name)

    def mean(self, name: str) -> float:
        """Mean value of timings."""
        return self.apply(lambda values: statistics.mean(values or [0]), name=name)

    def median(self, name: str) -> float:
        """Median value of timings."""
        return self.apply(lambda values: statistics.median(values or [0]), name=name)

    def p95(self, name: str) -> float:
        return self.apply(
            lambda values: statistics.quantiles(
                values or [0], n=100, method="inclusive"
            )[95],
            name=name,
        )

    def stdev(self, name: str) -> float:
        """Standard deviation of timings."""
        if name in self._timings:
            value = self._timings[name]
            return statistics.stdev(value) if len(value) >= 2 else math.nan
        raise KeyError(name)

    def stats(self, name: str) -> Dict[str, float]:
        """All the stats for a given timer."""
        return {
            "count": self.count(name),
            "min": self.min(name),
            "max": self.max(name),
            "mean": self.mean(name),
            "median": self.median(name),
            "p95": self.p95(name),
            "stdev": self.stdev(name),
            "sum_total": self.total(name),
        }

    def __repr__(self) -> str:
        """Return a string representation of the TimerStats."""
        stats_repr = {k: self.stats(k) for k in self._timings.keys()}
        return f"{self.__class__.__name__}({pprint.pformat(stats_repr)})"

__init__(*args, **kwargs)

Add a private dictionary keeping track of all timings

Source code in landingai/timer.py 
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def __init__(self, *args: Any, **kwargs: Any) -> None:
    """Add a private dictionary keeping track of all timings"""
    super().__init__(*args, **kwargs)
    self._timings: Dict[str, MutableSequence[float]] = defaultdict(
        partial(deque, maxlen=_MAX_SIZE)
    )

__repr__()

Return a string representation of the TimerStats.

Source code in landingai/timer.py 
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def __repr__(self) -> str:
    """Return a string representation of the TimerStats."""
    stats_repr = {k: self.stats(k) for k in self._timings.keys()}
    return f"{self.__class__.__name__}({pprint.pformat(stats_repr)})"

add(name, value)

Add a timing value to the given timer.

Source code in landingai/timer.py 
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def add(self, name: str, value: float) -> None:
    """Add a timing value to the given timer."""
    self._timings[name].append(value)

apply(func, name)

Apply a function to the results of one named timer.

Source code in landingai/timer.py 
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def apply(self, func: Callable[[Sequence[float]], float], name: str) -> float:
    """Apply a function to the results of one named timer."""
    if name in self._timings:
        return func(self._timings[name])
    raise KeyError(name)

clear()

Clear timers.

Source code in landingai/timer.py 
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def clear(self) -> None:
    """Clear timers."""
    self._timings.clear()

count(name)

Number of timings.

Source code in landingai/timer.py 
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def count(self, name: str) -> float:
    """Number of timings."""
    return self.apply(len, name=name)

max(name)

Maximal value of timings.

Source code in landingai/timer.py 
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def max(self, name: str) -> float:
    """Maximal value of timings."""
    return self.apply(lambda values: max(values or [0]), name=name)

mean(name)

Mean value of timings.

Source code in landingai/timer.py 
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def mean(self, name: str) -> float:
    """Mean value of timings."""
    return self.apply(lambda values: statistics.mean(values or [0]), name=name)

median(name)

Median value of timings.

Source code in landingai/timer.py 
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def median(self, name: str) -> float:
    """Median value of timings."""
    return self.apply(lambda values: statistics.median(values or [0]), name=name)

min(name)

Minimal value of timings.

Source code in landingai/timer.py 
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def min(self, name: str) -> float:
    """Minimal value of timings."""
    return self.apply(lambda values: min(values or [0]), name=name)

stats(name)

All the stats for a given timer.

Source code in landingai/timer.py 
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def stats(self, name: str) -> Dict[str, float]:
    """All the stats for a given timer."""
    return {
        "count": self.count(name),
        "min": self.min(name),
        "max": self.max(name),
        "mean": self.mean(name),
        "median": self.median(name),
        "p95": self.p95(name),
        "stdev": self.stdev(name),
        "sum_total": self.total(name),
    }

stdev(name)

Standard deviation of timings.

Source code in landingai/timer.py 
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def stdev(self, name: str) -> float:
    """Standard deviation of timings."""
    if name in self._timings:
        value = self._timings[name]
        return statistics.stdev(value) if len(value) >= 2 else math.nan
    raise KeyError(name)

total(name)

Total time for timers.

Source code in landingai/timer.py 
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def total(self, name: str) -> float:
    """Total time for timers."""
    return self.apply(sum, name=name)
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