import numpy as np
import time
from collections import deque

# timer
class Timer:
    def __init__(self, interval=10):
        self.value = 0.0
        self.start = time.time()
        self.buffer = deque(maxlen=interval)

    def __enter__(self):
        self.start = time.time()

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.value = time.time() - self.start
        self.buffer.append(self.value)

    @property
    def now(self):
        """Return the seconds elapsed since initializing this class"""
        return time.time() - self.start

    @property
    def avg(self):
        return np.mean(self.buffer, dtype=float)