I’m also trying to do something similar but in my scenario I construct a whole model using only nn.Sequential and then I just want to save it. I don’t have a class defined for it so something like https://stackoverflow.com/questions/42703500/best-way-to-save-a-trained-model-in-pytorch 2 won’t work for me.

My current attempt uses pickle but I keep getting warning for using pickle:
FutureWarning: pickle support for Storage will be removed in 1.5. Use `torch.save` instead
  warnings.warn("pickle support for Storage will be removed in 1.5. Use `torch.save` instead", FutureWarning)


I think they just want us to use torch.save and torch.load. I stopped getting warning when I did that.
My (full) code:

# creating data and running through a nn and saving it

import torch
import torch.nn as nn

from pathlib import Path
from collections import OrderedDict

import numpy as np

import pickle

path = Path('~/data/tmp/').expanduser()
path.mkdir(parents=True, exist_ok=True)

num_samples = 3
Din, Dout = 1, 1
lb, ub = -1, 1

x = torch.torch.distributions.Uniform(low=lb, high=ub).sample((num_samples, Din))

f = nn.Sequential(OrderedDict([
    ('f1', nn.Linear(Din,Dout)),
    ('out', nn.SELU())
]))
y = f(x)

# save data torch to numpy
x_np, y_np = x.detach().cpu().numpy(), y.detach().cpu().numpy()
np.savez(path / 'db', x=x_np, y=y_np)

print(x_np)
# save model
with open('db_saving_seq', 'wb') as file:
    pickle.dump({'f': f}, file)

# load model
with open('db_saving_seq', 'rb') as file:
    db = pickle.load(file)
    f2 = db['f']

# test that it outputs the right thing
y2 = f2(x)

y_eq_y2 = y == y2
print(y_eq_y2)

db2 = {'f': f, 'x': x, 'y': y}
torch.save(db2, path / 'db_f_x_y')

print('Done')

db3 = torch.load(path / 'db_f_x_y')
f3 = db3['f']
x3 = db3['x']
y3 = db3['y']
yy3 = f3(x3)

y_eq_y3 = y == y3
print(y_eq_y3)

y_eq_yy3 = y == yy3
print(y_eq_yy3)

did you try that? Is there a reason why that’s not enough for you?

cross-posted: https://stackoverflow.com/questions/62923052/how-does-one-save-torch-nn-sequential-models-in-pytorch-properly 17