#!/usr/bin/env python

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'''
This module pre-defines initial value for fields
'''

def get_init_values(identifier, **kwargs):
    '''
    This method returns field, a set of key-value pairs, that
    key is specified by identifier and values are initialized.
    '''

    field = {}

    if identifier == 'none':
        return

    if identifier == 'uniform':
        scale = kwargs['scale'] if 'scale' in kwargs else 0.05
        names = ['low', 'high']
        values = [-scale, scale]

    elif identifier == 'constant':
        names = ['value']
        values = [0]

    elif identifier == 'gaussian':
        names = ['mean', 'std']
        values = [0, 0.01]

    elif identifier == 'conv2d':
        names = ['stride', 'pad']
        values = [1, 0]

    elif identifier == 'lrn2d':
        names = ['alpha', 'beta', 'knorm']
        values = [1, 0.75, 1]

    elif identifier == 'dropout':
        names = ['ratio']
        values = [0.5]

    for i in range(len(names)):
        field[names[i]] = kwargs[names[i]] if names[i] in kwargs else values[i]

    return field