logger.py

import sys
if sys.version_info[0] < 3:
    import cPickle as pickle
else:
    import _pickle as pickle
import os
import shutil
import numpy as np
import matplotlib.pyplot as plt
import time

plot_from_index = -10000


def copy_script_to_folder(caller_path, folder):
    '''copy script'''
    script_filename = caller_path.split('/')[-1]
    script_relative_path = os.path.join(folder, script_filename)
    shutil.copy(caller_path, script_relative_path)


def time_string():
    '''convert time format'''
    ISOTIMEFORMAT = '%Y-%m-%d %X'
    string = '[{}]'.format(time.strftime(ISOTIMEFORMAT, time.gmtime(time.time())))
    return string


def convert_secs2time(epoch_time):
    need_hour = int(epoch_time / 3600)
    need_mins = int((epoch_time - 3600 * need_hour) / 60)
    need_secs = int(epoch_time - 3600 * need_hour - 60 * need_mins)
    return need_hour, need_mins, need_secs


class RecorderMeter(object):
    """Computes and stores the minimum loss value and its epoch index"""
    def __init__(self, total_epoch):
        self.reset(total_epoch)

    def reset(self, total_epoch):
        assert total_epoch > 0
        self.total_epoch = total_epoch
        self.current_epoch = 0
        self.epoch_losses = np.zeros((self.total_epoch, 2), dtype=np.float32)  # [epoch, train/val]
        self.epoch_losses = self.epoch_losses - 1

        self.epoch_accuracy = np.zeros((self.total_epoch, 2),
                                       dtype=np.float32)  # [epoch, train/val]
        self.epoch_accuracy = self.epoch_accuracy

    def update(self, idx, train_loss, train_acc, val_loss, val_acc):
        assert idx >= 0 and idx < self.total_epoch, 'total_epoch : {} , but update with the {} index'.format(
            self.total_epoch, idx)
        self.epoch_losses[idx, 0] = train_loss
        self.epoch_losses[idx, 1] = val_loss
        self.epoch_accuracy[idx, 0] = train_acc
        self.epoch_accuracy[idx, 1] = val_acc
        self.current_epoch = idx + 1
        return self.max_accuracy(False) == val_acc

    def max_accuracy(self, istrain):
        if self.current_epoch <= 0: return 0
        if istrain: return self.epoch_accuracy[:self.current_epoch, 0].max()
        else: return self.epoch_accuracy[:self.current_epoch, 1].max()

    def plot_curve(self, save_path):
        title = 'the accuracy/loss curve of train/val'
        dpi = 80
        width, height = 1200, 800
        legend_fontsize = 10
        scale_distance = 48.8
        figsize = width / float(dpi), height / float(dpi)

        fig = plt.figure(figsize=figsize)
        x_axis = np.array([i for i in range(self.total_epoch)])  # epochs
        y_axis = np.zeros(self.total_epoch)

        plt.xlim(0, self.total_epoch)
        plt.ylim(0, 100)
        interval_y = 5
        interval_x = 5
        plt.xticks(np.arange(0, self.total_epoch + interval_x, interval_x))
        plt.yticks(np.arange(0, 100 + interval_y, interval_y))
        plt.grid()
        plt.title(title, fontsize=20)
        plt.xlabel('the training epoch', fontsize=16)
        plt.ylabel('accuracy', fontsize=16)

        y_axis[:] = self.epoch_accuracy[:, 0]
        plt.plot(x_axis, y_axis, color='g', linestyle='-', label='train-accuracy', lw=2)
        plt.legend(loc=4, fontsize=legend_fontsize)

        y_axis[:] = self.epoch_accuracy[:, 1]
        plt.plot(x_axis, y_axis, color='y', linestyle='-', label='valid-accuracy', lw=2)
        plt.legend(loc=4, fontsize=legend_fontsize)

        y_axis[:] = self.epoch_losses[:, 0]
        plt.plot(x_axis, y_axis * 50, color='g', linestyle=':', label='train-loss-x50', lw=2)
        plt.legend(loc=4, fontsize=legend_fontsize)

        y_axis[:] = self.epoch_losses[:, 1]
        plt.plot(x_axis, y_axis * 50, color='y', linestyle=':', label='valid-loss-x50', lw=2)
        plt.legend(loc=4, fontsize=legend_fontsize)

        if save_path is not None:
            fig.savefig(save_path, dpi=dpi, bbox_inches='tight')
            print('---- save figure {} into {}'.format(title, save_path))
        plt.close(fig)


class AverageMeter(object):
    """Computes and stores the average and current value"""
    def __init__(self):
        self.reset()

    def reset(self):
        self.val = 0
        self.avg = 0
        self.sum = 0
        self.count = 0

    def update(self, val, n=1):
        self.val = val
        self.sum += val * n
        self.count += n
        self.avg = self.sum / self.count


def plotting(exp_dir):
    train_dict = pickle.load(open(os.path.join(exp_dir, 'log.pkl'), 'rb'))

    plt.plot(np.asarray(train_dict['train_loss']), label='train_loss')
    plt.plot(np.asarray(train_dict['test_loss']), label='test_loss')

    plt.xlabel('evaluation step')
    plt.ylabel('metrics')
    plt.tight_layout()
    plt.legend(loc='upper right')
    plt.savefig(os.path.join(exp_dir, 'loss.png'))
    plt.clf()

    # Plot accuracy
    plt.plot(np.asarray(train_dict['train_acc']), label='train_acc')
    plt.plot(np.asarray(train_dict['test_acc']), label='test_acc')

    plt.xlabel('evaluation step')
    plt.ylabel('metrics')
    plt.tight_layout()
    plt.legend(loc='upper right')
    plt.savefig(os.path.join(exp_dir, 'acc.png'))
    plt.clf()


if __name__ == '__main__':
    plotting('temop')