utils.py

'''Some helper functions for PyTorch, including:
    - get_mean_and_std: calculate the mean and std value of dataset.
    - msr_init: net parameter initialization.
    - progress_bar: progress bar mimic xlua.progress.
'''
import os
import sys
import time
from datetime import datetime
import shutil
import numpy as np


class Logger(object):
    """Reference: https://gist.github.com/gyglim/1f8dfb1b5c82627ae3efcfbbadb9f514"""
    def __init__(self, logdir, train=True):
        if train:
            if len(os.listdir(logdir)) != 0:
                print(logdir)
                ans = input("Folder is not empty. All data inside folder will be deleted. "
                                "Will you proceed [y/N]? ")
                if ans in ['y', 'Y']:
                    shutil.rmtree(logdir)
                else:
                    exit(1)
        if train:
            self.set_dir(logdir)
        else:
            self.set_dir(logdir, 'log_test.txt')

    def set_dir(self, logdir, log_fn='log.txt'):
        self.logdir = logdir
        if not os.path.exists(logdir):
            os.mkdir(logdir)
        if os.path.exists(os.path.join(logdir, log_fn)):
            print(os.path.join(logdir, log_fn))
            ans = input("log file exists. log file will be deleted. "
                            "Will you proceed [y/N]? ")
            if ans in ['y', 'Y']:
                os.remove(os.path.join(logdir, log_fn))
            else:
                exit(1)
        self.log_file = open(os.path.join(logdir, log_fn), 'a')

    def log(self, string):
        self.log_file.write('[%s] %s' % (datetime.now(), string) + '\n')
        self.log_file.flush()

        print('[%s] %s' % (datetime.now(), string))
        sys.stdout.flush()

    def log_dirname(self, string):
        self.log_file.write('%s (%s)' % (string, self.logdir) + '\n')
        self.log_file.flush()

        print('%s (%s)' % (string, self.logdir))
        sys.stdout.flush()


_, term_width = os.popen('stty size', 'r').read().split()
term_width = int(term_width)

TOTAL_BAR_LENGTH = 50.
last_time = time.time()
begin_time = last_time


def progress_bar(current, total, msg=None):
    global last_time, begin_time
    if current == 0:
        begin_time = time.time()  # Reset for new bar.

    cur_len = int(TOTAL_BAR_LENGTH*current/total)
    rest_len = int(TOTAL_BAR_LENGTH - cur_len) - 1

    sys.stdout.write(' [')
    for i in range(cur_len):
        sys.stdout.write('=')
    sys.stdout.write('>')
    for i in range(rest_len):
        sys.stdout.write('.')
    sys.stdout.write(']')

    cur_time = time.time()
    step_time = cur_time - last_time
    last_time = cur_time
    tot_time = cur_time - begin_time

    L = []
    L.append('  Step: %s' % format_time(step_time))
    L.append(' | Tot: %s' % format_time(tot_time))
    if msg:
        L.append(' | ' + msg)

    msg = ''.join(L)
    sys.stdout.write(msg)
    for i in range(term_width-int(TOTAL_BAR_LENGTH)-len(msg)-3):
        sys.stdout.write(' ')

    # Go back to the center of the bar.
    for i in range(term_width-int(TOTAL_BAR_LENGTH/2)):
        sys.stdout.write('\b')
    sys.stdout.write(' %d/%d ' % (current+1, total))

    if current < total-1:
        sys.stdout.write('\r')
    else:
        sys.stdout.write('\n')
    sys.stdout.flush()


def format_time(seconds):
    days = int(seconds / 3600/24)
    seconds = seconds - days*3600*24
    hours = int(seconds / 3600)
    seconds = seconds - hours*3600
    minutes = int(seconds / 60)
    seconds = seconds - minutes*60
    secondsf = int(seconds)
    seconds = seconds - secondsf
    millis = int(seconds*1000)

    f = ''
    i = 1
    if days > 0:
        f += str(days) + 'D'
        i += 1
    if hours > 0 and i <= 2:
        f += str(hours) + 'h'
        i += 1
    if minutes > 0 and i <= 2:
        f += str(minutes) + 'm'
        i += 1
    if secondsf > 0 and i <= 2:
        f += str(secondsf) + 's'
        i += 1
    if millis > 0 and i <= 2:
        f += str(millis) + 'ms'
        i += 1
    if f == '':
        f = '0ms'
    return f