pretrained=True、False的区别？

pretrained 设置为 True，会

自动下载模型所对应权重，并加载到模型中


以下内容用于加深理解，你懂的话就别花时间看！！！


代码是 pretrained 分别为 True 和 False 的模型 load 及 print

import torch
import torchvision
v = torchvision.models.vgg16(pretrained=True)
print('_____v pretrained_____')
# print(v)
torch.save(v.state_dict(), "vgg16_method.pth")
model = torch.load("vgg16_method.pth")
print(model)

v1 = torchvision.models.vgg16(pretrained=False)
print('_____v not pretrained_____')
# print(v1)
torch.save(v1.state_dict(), "vgg16_method1.pth")
model1 = torch.load("vgg16_method1.pth")
print(model1)


pretrained = True


(‘classifier.6.weight’, tensor([[ 1.3450e-02, 4.2154e-02, -2.3040e-03, …, -4.9025e-04,

1.8880e-02, -1.4209e-02],

[ 7.6020e-03, 4.7305e-02, -5.0164e-03, …, -4.9127e-03,

-5.6295e-03, -1.4197e-02],

[ 2.1238e-03, -1.2520e-02, -1.8903e-02, …, -1.0263e-02, 3.0020e-02, -2.8852e-02],

…,

[-9.8278e-03, 3.2054e-02, 3.5979e-02, …, -5.6409e-03,

8.3202e-03, -7.5155e-03],

[ 1.6646e-02, -1.1247e-03, 1.5044e-03, …, -9.1578e-03,

-8.6418e-03, -2.0923e-02],

[-6.4900e-06, -2.2274e-02, 5.2750e-04, …, 4.4403e-02,

-9.4047e-03, -1.2332e-02]])),

(‘classifier.6.bias’, tensor([ 2.0239e-02, -2.9844e-02, -6.0355e-03, 5.3569e-03, 2.4703e-02,

9.4541e-04, 7.6767e-03, -1.2997e-02, -1.7257e-02, 2.4917e-03,

-2.9578e-03, -1.2410e-02, 1.9179e-02, 2.2878e-02, 1.6132e-02,

-1.5368e-02, 1.3967e-03, 4.3597e-04, 1.4483e-02, 1.6664e-02,

1.0173e-02, 2.3670e-02, -1.2096e-03, 1.6110e-02, -5.3769e-03,

-1.1735e-02, -1.0727e-02, -2.9511e-02, -7.2404e-03, 3.9187e-02,

1.1590e-02, 2.8063e-03, -5.4244e-03, -4.0255e-03, 1.3839e-04,

-1.1612e-02, -1.8595e-03, 1.5770e-02, -1.7732e-02, 1.0556e-02,

1.2518e-02, 6.8095e-03, -1.2896e-02, -4.4475e-03, 3.5410e-03,

-2.7491e-03, 2.2288e-02, 2.3229e-02, 1.0078e-02, 1.2641e-02,

7.9056e-03, 2.1109e-02, -1.6828e-02, 6.2936e-03, -2.8307e-02,

7.4882e-03, -2.9438e-02, 4.9023e-02, 4.9702e-02, 3.8240e-02,

-6.2107e-02, 1.7567e-02, 1.3668e-02, 5.5128e-02, 6.3641e-02,

-1.5907e-02, -2.1543e-02, 2.4153e-02, 2.9221e-03, 3.6656e-02,

-2.5589e-04, 1.0257e-02, 6.0446e-02, -2.0747e-02, -2.8418e-02,

3.8297e-02, 2.2449e-02, 1.2476e-02, -1.6173e-02, -6.9245e-03,

-1.2505e-02, -5.7967e-03, -1.4107e-02, -3.1422e-02, -1.4501e-02,

2.6878e-02, 8.3460e-04, 6.1786e-02, -2.5483e-02, 4.5734e-02,

-2.3228e-02, -4.4627e-04, -1.7937e-02, -2.0320e-02, -9.1343e-04,

-6.4768e-03, 2.8838e-03, 1.1061e-02, -6.5366e-03, -2.7389e-02,

-6.6679e-05, 1.2584e-02, 1.9082e-02, 3.7356e-02, 5.4718e-03,

3.8678e-02, 6.9227e-03, -2.8615e-02, -6.7014e-03, -4.2353e-02,

-1.1660e-01, 1.1963e-02, 1.0936e-03, 2.6548e-02, 1.8300e-02,

-5.5016e-02, -1.6249e-03, 2.6446e-02, -2.7349e-03, -2.7034e-02,

1.0505e-03, -3.8161e-02, 1.3213e-02, -4.9820e-03, -2.4466e-02,

5.7482e-03, -6.1060e-02, 2.7150e-03, 5.9516e-03, 7.9525e-04,

-6.7904e-02, 8.9988e-03, 4.4904e-02, -4.1445e-03, -4.8999e-02,

-3.8526e-02, -3.0757e-02, -3.0013e-03, 4.4977e-03, -7.2840e-03,

7.6950e-03, 5.5544e-03, -1.5949e-02, -3.3493e-02, -1.2481e-02,

-1.9195e-02, 2.0324e-02, 5.3610e-03, 1.9483e-02, 1.8587e-02,

5.8054e-03, 1.7311e-02, -8.2453e-02, 6.2503e-02, -1.2923e-02,

2.0150e-02, 2.7138e-02, -1.7074e-03, -5.9132e-02, 2.4080e-02,

-6.3872e-03, 3.1647e-02, 7.6580e-02, -3.4454e-04, 3.1730e-02,

-2.8833e-02, 5.7331e-03, -3.9463e-02, 4.0252e-02, 8.9949e-03,

3.5317e-02, 7.2347e-02, -5.3385e-04, -2.8689e-02, 6.2374e-02,

-4.2100e-02, 1.2404e-02, 3.7113e-02, 4.2264e-02, -1.0894e-03,

2.5798e-02, 1.3201e-02, 5.9872e-02, 2.6516e-02, -7.7218e-03,

1.6828e-02, 1.9599e-02, 3.4458e-02, -8.9315e-03, 2.9612e-02,

-1.1887e-02, 3.1144e-02, 3.7925e-02, -6.8350e-03, 2.9055e-02,

7.0744e-02, 3.5352e-02, 4.5257e-03, -6.7377e-03, 4.8965e-02,

-7.1239e-02, 6.5041e-03, 5.8401e-02, 5.3597e-02, 1.7927e-02,

3.6933e-02, -1.9689e-02, 3.3865e-02, -1.3453e-02, 6.9940e-02,

4.4340e-03, -1.8287e-02, 1.5174e-02, -2.2757e-02, 1.6309e-02,

4.5446e-02, -2.8600e-02, 4.9436e-02, 7.5250e-03, -1.0546e-02,

-2.2604e-02, -1.6502e-02, 4.5720e-02, 8.4474e-02, -1.2261e-02,

7.2513e-02, 2.4530e-03, 6.4050e-03, -6.6105e-03, 7.0984e-02,

3.5590e-02, -2.1918e-02, 6.7042e-02, 1.5241e-02, 6.0627e-02,

1.0640e-02, 2.5195e-02, 4.0457e-02, 4.5375e-02, 6.4500e-02,

1.4049e-02, -2.6033e-02, 6.9238e-03, 1.5410e-02, 1.0396e-02,

-2.2500e-03, -2.1743e-02, 2.7361e-02, -4.0054e-03, 3.6920e-03,

4.8795e-02, 2.2010e-02, 2.3484e-02, -3.5672e-02, 5.9931e-02,

3.5723e-03, 1.0215e-02, 7.1785e-02, 1.5093e-02, 1.9409e-02,

-1.0631e-02, 1.0041e-02, -3.5025e-02, 5.1083e-02, 6.7416e-03,

1.5887e-02, 4.2009e-02, -5.0773e-02, -1.7900e-02, 2.7642e-02,

2.0627e-02, -4.6130e-03, 2.1796e-02, 5.9296e-03, -3.2989e-02,

-7.5952e-03, 1.9803e-02, 9.4290e-03, -8.7341e-03, 1.7098e-02,

-2.2270e-02, 1.2361e-01, -3.8207e-02, 1.4395e-03, 5.4520e-02,

4.8118e-02, 3.4782e-02, -4.7019e-03, -1.9831e-02, 3.8845e-02,

6.0850e-03, -1.4381e-02, 4.9491e-02, -2.7058e-02, -2.4787e-02,

-6.3279e-03, 1.4277e-02, 2.2483e-02, -4.9233e-02, 3.8480e-02,

-2.9650e-02, -1.8599e-02, -1.9932e-03, -4.2109e-02, -6.0562e-02,

1.7470e-02, 2.7788e-02, -3.4156e-02, -5.0233e-03, -2.0081e-02,

-5.3831e-02, -7.0464e-03, -4.0125e-02, 5.2068e-02, 5.3731e-03,

9.0153e-03, -3.2561e-05, -3.3795e-02, -2.7959e-02, -2.4056e-02,

-1.0066e-02, -3.8689e-02, -2.3882e-02, -2.8881e-02, 1.9373e-03,

-5.9984e-02, -1.3545e-02, -6.0373e-02, -3.1486e-02, -7.4332e-02,

6.3616e-03, -3.0455e-02, 3.0601e-02, 5.2993e-02, 5.1747e-02,

2.2551e-02, 9.0139e-03, -2.1590e-02, -4.8878e-02, 2.6130e-02,

-1.2450e-03, -3.8225e-02, 6.8278e-03, 1.5274e-02, 2.5427e-02,

-3.3353e-02, 3.3671e-02, 1.6623e-02, -1.6129e-02, 2.3300e-02,

2.6170e-02, -8.3109e-03, -1.3620e-02, -1.0198e-02, 1.2645e-02,

-2.7044e-03, -5.1699e-02, -1.2183e-02, -4.2912e-03, 7.0602e-02,

-1.0591e-02, 3.3304e-02, 1.5505e-03, 2.7523e-02, 3.5229e-02,

2.6252e-02, 4.7357e-02, 2.9449e-02, -1.5236e-02, 4.1031e-02,

-1.1941e-02, -3.8416e-02, 3.4909e-02, 2.5368e-02, 5.3995e-04,

3.2529e-03, 2.0679e-02, 1.6295e-02, 5.9731e-02, 1.5224e-02,

-6.0552e-02, -1.7674e-02, 6.6975e-02, 1.4761e-02, -1.9037e-02,

-3.4594e-03, 3.7793e-02, -5.1098e-03, 5.8897e-03, 1.9403e-02,

-2.3564e-02, 1.9174e-02, -2.2748e-02, -2.0098e-02, -5.0562e-03,

2.3758e-02, 6.6555e-03, -7.3947e-03, -5.6201e-02, 2.3188e-02,

3.3316e-03, 2.4976e-02, -1.3101e-02, 2.4161e-02, -8.5088e-03,

4.9697e-02, 1.0554e-02, -7.4188e-02, -7.5903e-02, -2.4110e-02,

1.1068e-03, -3.4545e-03, -1.6059e-02, 3.6029e-02, -2.8019e-03,

-2.6729e-02, 3.9026e-02, -4.2616e-02, -9.9599e-03, -8.3776e-03,

2.8448e-02, -1.2167e-02, -5.3328e-02, 3.4896e-02, 5.4654e-02,

8.9463e-03, -4.2294e-02, -6.1719e-02, 7.0205e-03, -3.2173e-02,

-3.7807e-03, 5.2077e-02, -2.3974e-02, 1.7426e-02, -6.8874e-02,

-2.6062e-03, 3.0595e-02, -1.5023e-02, 1.4022e-02, -5.0861e-02,

3.7215e-03, -2.6806e-03, 3.5630e-02, -3.0362e-02, 2.2297e-02,

4.9580e-02, 1.2369e-03, -3.4180e-02, 6.0701e-02, 3.3855e-02,

6.1321e-03, 7.2363e-03, -1.6917e-03, 3.6149e-02, 2.1222e-02,

-3.3272e-02, 1.9069e-02, -6.0149e-03, -2.7366e-02, 2.8984e-03,

-3.4129e-03, 1.6887e-02, -3.5749e-03, -6.8191e-02, 2.3846e-02,

1.6106e-02, 4.3023e-02, 1.3928e-02, 2.9887e-02, 1.4960e-02,

-2.2989e-02, 2.0963e-02, -2.8435e-02, 2.0125e-02, 3.3749e-02,

8.2363e-02, -2.5720e-02, 1.0292e-01, 1.2403e-03, -2.7880e-02,

5.2865e-02, -2.4874e-02, 5.8873e-03, -4.3715e-03, -2.7919e-02,

3.2519e-02, -1.7567e-02, 5.1975e-02, -8.3832e-02, 1.4786e-02,

-1.2771e-02, 4.5308e-02, 2.4353e-02, -4.0642e-02, -5.5089e-02,

-2.2368e-02, 3.3539e-02, -7.9810e-02, 2.2758e-02, -1.9840e-02,

9.0427e-03, -2.4242e-02, -9.2313e-02, 1.1919e-02, 2.4050e-02,

3.2105e-02, -8.4704e-02, -1.6657e-02, -3.0554e-03, 4.6309e-03,

-2.3363e-02, -4.5799e-03, 1.5235e-02, 1.2100e-02, 1.2569e-02,

1.6497e-02, -1.9934e-02, 3.3158e-02, -8.1766e-03, -2.0283e-02,

-3.6283e-02, -7.5604e-03, 2.8872e-02, 2.8258e-03, 4.4513e-02,

4.7551e-03, 7.7385e-02, 5.9271e-02, -3.0499e-02, -8.8495e-05,

-1.0404e-02, -1.9523e-02, -8.4611e-04, -2.3710e-02, 1.6756e-02,

3.8044e-02, -2.4882e-02, 2.7985e-02, -2.4580e-03, -2.7513e-03,

-1.4628e-02, -4.4961e-02, -2.0490e-03, -4.6212e-02, -7.0188e-03,

-5.3620e-03, -3.9620e-03, -1.1776e-02, 2.6604e-02, 2.2971e-02,

2.5485e-02, 2.3256e-02, -3.0783e-02, -4.4985e-02, -2.1356e-02,

-1.3835e-02, -3.7883e-02, 1.3674e-02, -3.5847e-02, -6.0238e-02,

-1.6030e-02, 9.9658e-03, -3.9750e-02, 5.1179e-02, 3.4657e-02,

-2.8058e-02, 8.1699e-04, -4.7458e-02, -5.6738e-03, 2.1224e-02,

4.1393e-02, -1.0330e-02, -2.4760e-02, -2.8965e-02, 4.1361e-03,

2.6227e-02, 1.1228e-02, 4.7628e-02, -2.4562e-02, 1.7258e-02,

-4.8839e-02, -2.7126e-02, -7.2327e-02, 4.3933e-02, -3.7270e-02,

2.8985e-03, 2.5128e-02, 2.5233e-02, -9.0966e-03, 3.1926e-02,

-1.4033e-02, -5.3370e-03, 2.5925e-02, -8.3037e-03, 1.8597e-02,

-3.4749e-02, -1.6617e-02, 8.2843e-02, 1.5086e-02, -5.0715e-02,

-3.2014e-02, -3.3381e-03, 9.9305e-04, 3.2323e-02, -9.5939e-03,

1.8850e-02, 3.1632e-02, -5.2701e-02, 8.1888e-03, -2.6958e-03,

3.2904e-02, -2.0901e-02, 3.1157e-03, 2.2588e-02, -2.1898e-02,

-4.5704e-02, -4.8732e-02, 4.9820e-02, -3.4660e-02, -5.2025e-02,

5.6527e-02, -2.0000e-03, 4.7569e-03, -1.0292e-02, -1.2004e-02,

-2.7112e-02, -4.4175e-03, 4.7015e-02, 9.4183e-03, -1.0293e-02,

2.4827e-02, -2.1165e-02, -3.4728e-02, 2.6178e-02, 3.3729e-02,

-1.0051e-02, -2.4959e-02, -4.0963e-02, -6.2759e-02, 7.6392e-03,

-2.4506e-02, -3.5312e-02, 5.4566e-03, -5.4158e-02, -7.5320e-02,

-1.8790e-02, -2.0657e-02, -1.2283e-02, 1.9106e-02, 1.3047e-02,

1.1992e-02, 4.5593e-02, -1.0798e-02, 2.5652e-02, 2.9297e-02,

7.1481e-02, 3.4396e-02, 1.7480e-02, -1.9279e-02, -3.8183e-02,

4.4221e-02, 2.0793e-02, 1.7786e-02, -4.1785e-03, 1.4240e-02,

4.6463e-02, -6.6139e-04, 1.8974e-03, 2.7180e-02, 2.9930e-02,

3.3525e-02, 7.7600e-02, 3.6428e-02, 2.0724e-02, 4.4268e-02,

6.6297e-03, -8.3840e-02, 1.1172e-02, 5.1371e-03, -1.3041e-02,

1.1880e-02, 2.2298e-02, 1.2055e-02, -1.6229e-02, -2.8393e-02,

2.8677e-02, -1.5870e-03, 5.2088e-05, -2.1988e-02, -1.6203e-02,

8.4714e-03, 5.5201e-02, -1.0171e-02, -6.9343e-02, -1.8714e-02,

4.0182e-02, 1.8755e-02, 2.8231e-03, -1.4027e-02, -1.4812e-02,

-2.5366e-02, -2.1691e-02, -3.7325e-02, 1.9513e-02, 4.1396e-02,

-6.7270e-02, 5.4385e-02, 3.6110e-02, -3.2586e-02, -1.5797e-02,

-1.4585e-02, -4.5290e-03, -2.4140e-02, 4.1866e-02, -4.2935e-02,

3.4227e-02, 1.4480e-02, 2.3407e-03, -1.0121e-02, 1.3590e-02,

1.0312e-02, -3.6855e-02, -5.6961e-03, -4.5189e-02, -8.2578e-03,

-2.2380e-05, 5.0056e-02, 6.8531e-03, -6.7496e-03, -3.3575e-02,

-6.2393e-02, 7.9509e-03, 1.4348e-02, -8.3250e-02, -3.0460e-02,

-1.0488e-02, -2.0691e-02, -2.8651e-02, 3.6568e-02, 1.0958e-01,

6.6219e-03, -2.2891e-02, 9.8843e-03, 4.3048e-02, -3.0546e-02,

4.7700e-02, -3.5618e-02, 1.5470e-02, -1.3976e-02, 2.7720e-02,

-2.5930e-02, 1.3437e-03, 2.8364e-02, -1.3526e-02, -6.8687e-02,

1.7460e-02, 5.0171e-02, 1.7448e-02, 3.8029e-02, 9.8575e-03,

2.2886e-02, 1.2857e-02, -2.6916e-02, 4.8951e-02, -9.6445e-03,

-3.5893e-02, -2.6359e-02, -2.0544e-02, 3.6961e-03, -9.1653e-03,

2.1354e-02, -4.2778e-02, -4.1528e-02, -3.8514e-02, -3.1796e-02,

3.4630e-02, 4.7508e-02, 2.4460e-02, -6.2255e-02, -5.2742e-02,

8.7197e-03, -4.4129e-03, -1.8273e-02, -3.5542e-02, -8.3854e-03,

7.8142e-02, 1.6183e-02, -2.9596e-02, 4.5440e-03, -1.6409e-02,

-6.8854e-02, 5.5268e-03, -9.1066e-04, 7.5423e-03, 3.0180e-04,

-4.5678e-02, 2.2746e-02, 1.7497e-03, -3.3456e-02, -9.0392e-03,

-6.2202e-02, 5.3786e-02, 3.8939e-04, 4.0257e-02, 3.1605e-03,

-6.9488e-02, -3.2256e-02, 2.3048e-02, 2.6307e-03, -3.9207e-02,

-5.0876e-02, -4.5844e-02, 3.2221e-02, -2.7124e-02, -7.5084e-03,

-4.4676e-03, 4.1103e-02, -5.6786e-03, -3.9598e-02, 1.4338e-02,

2.3843e-03, 1.4621e-02, 4.6011e-02, 7.8583e-04, 1.3014e-02,

1.4411e-02, -2.8963e-02, -4.4605e-02, 8.5262e-03, -2.8862e-02,

-5.3216e-03, 2.0222e-02, 3.5987e-03, 1.5160e-02, 8.0866e-02,

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