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# python3.7
"""Misc utility functions used for model running."""
__all__ = ['format_time']
def format_time(seconds):
"""Formats seconds to readable time string.
Args:
seconds: Number of seconds to format.
Returns:
The formatted time string.
Raises:
ValueError: If the input `seconds` is less than 0.
"""
if seconds < 0:
raise ValueError(f'Input `seconds` should be greater than or equal to '
f'0, but `{seconds}` is received!')
# Returns seconds as float if less than 1 minute.
if seconds < 10:
return f'{seconds:5.3f}s'
if seconds < 60:
return f'{seconds:5.2f}s'
seconds = int(seconds + 0.5)
days, seconds = divmod(seconds, 86400)
hours, seconds = divmod(seconds, 3600)
minutes, seconds = divmod(seconds, 60)
if days:
return f'{days:2d}d{hours:02d}h'
if hours:
return f'{hours:2d}h{minutes:02d}m'
return f'{minutes:2d}m{seconds:02d}s'
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