深度学习笔记（一）—— 初识 Jupyter

Activation Functions

Complete the activation functions below:

import numpy as np

class Activation:
    
    def sigmoid(self,x):
        y = 1.0 / (1.0 + np.exp(-x))
        return y
    
    def tanh(self,x):
        y = (np.exp(x) - np.exp(-x)) / (np.exp(x) + np.exp(-x))
        return y
    
    def relu(self,x):
        if x >= 0:
            y = x
        else:
            y = 0
        return y
    
    def leaky_relu(self,alpha,x):
        if x >= 0:
            y = x
        else:
            y = alpha*x
        return y
    
    def elu(self,alpha,x):
        if x >= 0:
            y = x
        else:
            y = alpha*(np.exp(x)-1)
        return y
    
activation = Activation()
print(activation.sigmoid(10))
print(activation.relu(20))
print(activation.tanh(-1))
print(activation.leaky_relu(0.1,-1))
print(activation.elu(0.1,-1))

0.9999546021312976
20
-0.7615941559557649
-0.1
-0.06321205588285576

Faces

Print out all the images’ name and the files' length.

import os

def listdir(path, list_name):
    for file in os.listdir(path):
        file_path = os.path.join(path, file)
        if os.path.isdir(file_path):
            listdir(file_path,list_name)
        elif os.path.splitext(file_path)[1]=='.jpg':
            file_name= os.path.split(file_path)[-1][0:-4]
            list_name.append(file_name)

'''
def writefile(list):
    f=open("faces.xlsx","w+")
    for i in list:
        f.writelines(i+'\n')
    f.close()

'''

path="face"
list=[]
listdir(path,list)
for i in list:
    print('\n'+'\"'+i+'\"'+'\n')

#writefile(set(list))

f=open("length.txt","w")
print("\nTotal files number: "+str(len(list))+"\n\n")
f.writelines("Total files number: "+str(len(list))+"\n\n")
f.close()

"2370961440_6bc8ce346c"
"2956581526_cd803f2daa"
"303808204_1f744bc407"
"3152653555_68322314f3"
"92053278_be61a225d2"
"343583208_e986824d77"
"299733036_fff5ea6f8e"
"57635685_d41c98f8ca"
"10comm-decarlo"
"809285949_6889026b53"
"1383023626_8a49e4879a"
"1084239450_e76e00b7e7"
"529447797_0f9d2fb756"
"2328398005_d328a70b4c"
"2173711035_dbd53b4f9f"
"2046713398_91aaa6fe1c"
"1878519279_f905d4f34e"
"2210514040_6b03ff2629"
"2322901504_08122b01ba"
"2327253037_66a61ea6fe"
"1549040388_b99e9fa295"
"363149951_8be04dc6c0"
"1198_0_861"
"2382SJ8"
"96063776_bdb3617b64"
"97308305_4b737d0873"
"110276240_bec305da91"
"297448785_b2dda4b2c0"
"137341995_e7c48e9a75"
"144044282_87cf3ff76e"
"252418361_440b75751b"
"262007783_943bbcf613"
"152601997_ec6429a43c"
"0805personali01"
"348272697_832ce65324"
"362167809_d5a5dcbfdb"
"2633371780_45b740b670"
"2902760364_89c50bde40"
"3298715079_5af7c78fcb"
"3074791551_baee7fa0c1"
"2902323565_100017b63c"
"2795838930_0cc5aa5f41"
"2722779845_7fcb64a096"
"2711409561_a0786a3d3d"
"3273658251_b95f65c244"
"3264867945_fe18d442c1"
"2647088981_60e9fe40cd"
"3325611505_ddc7beffa1"
"deeny.peggy"
"matt-mathes"
"person"
"person_TjahjonoDGondhowiardjo"
"3855944735_e252959937"
"3856149136_d4595ffdd4"
"3872768751_e60d7fdbd5"
"3638950581_3387685d3a"
"3790616528_297c0ac935"
"3718903026_c1bf5dfcf8"
"3574737496_6ee8207045"
"3689162471_5f9ffb5aa0"
"3646828311_bfeb429ef7"
"person-7"
"3534189272_8ef88ba368"
"3555944509_7b477069c6"
"britney-bald"
"3461016494_56cce9c984"
"3534188114_2108895291"
"3362762930_24f76cb89c"
"personalpic"


Total files number: 69