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Add example for using TorchScript (#328)
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# -*- coding: utf-8 -*- | ||
""" | ||
Using TorchScript to serialize and deploy model | ||
=============================================== | ||
Models in TorchANI's model zoo support TorchScript. TorchScript is a way to create | ||
serializable and optimizable models from PyTorch code. It allows users to saved their | ||
models from a Python process and loaded in a process where there is no Python dependency. | ||
""" | ||
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############################################################################### | ||
# To begin with, let's first import the modules we will use: | ||
import torch | ||
import torchani | ||
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############################################################################### | ||
# Let's now load the built-in ANI-1ccx models. The builtin ANI-1ccx contains 8 | ||
# models trained with diffrent initialization. | ||
model = torchani.models.ANI1ccx() | ||
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############################################################################### | ||
# It is very easy to compile and save the model using `torch.jit`. | ||
compiled_model = torch.jit.script(model) | ||
torch.jit.save(compiled_model, 'compiled_model.pt') | ||
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############################################################################### | ||
# Besides compiling the ensemble, it is also possible to compile a single network | ||
compiled_model0 = torch.jit.script(model[0]) | ||
torch.jit.save(compiled_model0, 'compiled_model0.pt') | ||
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############################################################################### | ||
# For testing purposes, we will now load the models we just saved and see if they | ||
# produces the same output as the original model: | ||
loaded_compiled_model = torch.jit.load('compiled_model.pt') | ||
loaded_compiled_model0 = torch.jit.load('compiled_model0.pt') | ||
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############################################################################### | ||
# We use the molecule below to test: | ||
coordinates = torch.tensor([[[0.03192167, 0.00638559, 0.01301679], | ||
[-0.83140486, 0.39370209, -0.26395324], | ||
[-0.66518241, -0.84461308, 0.20759389], | ||
[0.45554739, 0.54289633, 0.81170881], | ||
[0.66091919, -0.16799635, -0.91037834]]]) | ||
species = model.species_to_tensor('CHHHH').unsqueeze(0) | ||
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############################################################################### | ||
# And here is the result: | ||
_, energies_ensemble = model((species, coordinates)) | ||
_, energies_single = model[0]((species, coordinates)) | ||
_, energies_ensemble_jit = loaded_compiled_model((species, coordinates)) | ||
_, energies_single_jit = loaded_compiled_model0((species, coordinates)) | ||
print('Ensemble energy, eager mode vs loaded jit:', energies_ensemble.item(), energies_ensemble_jit.item()) | ||
print('Single network energy, eager mode vs loaded jit:', energies_single.item(), energies_single_jit.item()) |