魔改keras中的model.summary()

之前做项目，好奇这个函数是怎么实现的，我把源码看了一遍，魔改代码，把没用的删除,重新封装为一个类，还加上了可以输出至txt的功能
'''
class print_summary_magic_modification:
def init(self, model, file_path):
self.model = model
self.file_path = file_path

def params_nums(weights):
    return int(np.sum([K.count_params(p) for p in set(weights)]))


def print_row(self, fields, positions):
    line = ''
    for i in range(len(fields)):
        if i > 0:
            line = line[:-1] + ' '
        line += str(fields[i])
        line = line[:positions[i]]
        line += ' ' * (positions[i] - len(line))
    print(line)

def print_layer_summary(self, layer, positions):
    try:
        output_shape = layer.output_shape
    except AttributeError:
        output_shape = 'multiple'
    name = layer.name
    cls_name = layer.__class__.__name__
    fields = [name + ' (' + cls_name + ')',
              output_shape, layer.count_params()]
    self.print_row(fields, positions)

def print_summary(self):
    """Prints a summary of a model.
    """
    line_length = 65
    positions = [29, 55, 100]

    # header names for the different log elements
    to_display = ['Layer (type)', 'Output Shape', 'Param #']

    print('_' * line_length)
    self.print_row(to_display, positions)
    print('=' * line_length)

    layers = self.model.layers
    for i in range(len(layers)):
        self.print_layer_summary(layers[i], positions)
        if i == len(layers) - 1:
            print('=' * line_length)
        else:
            print('_' * line_length)


def print_summary2txt(self):
    """Prints a summary of a model.
    """
    with open(self.file_path, 'a', encoding='utf-8') as f:

        line_length = 65
        positions = [29, 55, 100]

        # header names for the different log elements
        to_display = ['Layer (type)', 'Output Shape', 'Param #']

        print('_' * line_length)
        self.print_row(to_display, positions)
        print('=' * line_length)

        layers = self.model.layers
        for i in range(len(layers)):
            self.print_layer_summary(layers[i], positions)
            if i == len(layers) - 1:
                print('=' * line_length)
            else:
                print('_' * line_length)

'''

下面这个功能可以直接使用model.summary()输出至txt文件，我在google中搜了好久找见的pythonic代码
'''
output_file_path = ''
file_name = ''
with open(output_file_path + file_name, 'w') as f:
with redirect_stdout(f):
model.summary()

'''