# -*- coding: utf-8 -*-
# /usr/bin/env python3
#
#  This software and supporting documentation are distributed by
#      Institut Federatif de Recherche 49
#      CEA/NeuroSpin, Batiment 145,
#      91191 Gif-sur-Yvette cedex
#      France
#
# This software is governed by the CeCILL license version 2 under
# French law and abiding by the rules of distribution of free software.
# You can  use, modify and/or redistribute the software under the
# terms of the CeCILL license version 2 as circulated by CEA, CNRS
# and INRIA at the following URL "http://www.cecill.info".
#
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import matplotlib.pyplot as plt


def plot_loss(list_loss_train, root_dir, *list_loss_val):
    """
    Plot training loss given two lists of loss

    Args:
        list_loss_train: list of loss values of training set
        list_loss_val: list of validation set loss values
    """
    plt.clf()
    plt.subplot()
    epoch = [k for k in range(1, len(list_loss_train) + 1)]
    plt.plot(epoch, list_loss_train, label='Train')
    if list_loss_val:
        plt.plot(epoch, list_loss_val, label='Validation')
    plt.xlabel('Number of epochs')
    plt.ylabel('Loss value')
    plt.legend()
    plt.savefig(root_dir+"loss.png")
