| CARVIEW |
PyTorch????GPU???g???ď?ݍ??݃I?[?g?G???R?[?_?[?̊w?K???????????Ă݂悤?F????Ď??????I?@?f?B?[?v???[?j???O?H?쎺?i1/2 ?y?[?W?j
GPU???g????悤??Google Colab??ݒ肵?APyTorch????GPU???g???ď?ݍ??݃I?[?g?G???R?[?_?[?̊w?K???????????Ă݂܂??傤?B
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?@?O???͏?ݍ??݃I?[?g?G???R?[?_?[???쐬???܂????B?S?????^?̃I?[?g?G???R?[?_?[?Ɣ?ׂ?ƁA?w?K?ɂ????鎞?Ԃ??Z???Ȃ?A???????ꂽ?摜???L???C?ɂȂ?܂????B
?@???????A???̏?ݍ??݃I?[?g?G???R?[?_?[?̊w?K?ɂ͖?50????????܂????B????100?G?|?b?N?̑S?????^?I?[?g?G???R?[?_?[?ł͊w?K?ɂ?1???Ԕ?????????A???̕????摜?????????????̂ł͂Ȃ????????Ƃ??l????ƁA????͑傫?Ȑi???ł͂???܂??B???A?????????????ɂ͂Ȃ?Ȃ????̂ł??傤???B
?@?????ŏo?Ă???̂??ACPU?̂悤?ȕ??G?ȏ????͋?肩??????܂??A?P???Ȑ??l?v?Z???????ɍs???Ă????GPU?ł??B?j???[?????l?b?g???[?N?ł́A?P???Ȍv?Z????ʂɎ??s????邱?Ƃ???AGPU???g?????ƂŁA?????̍????????????߂܂??B
?@?????ō???́APyTorch??Google Colab?????GPU???g???A??ݍ??݃I?[?g?G???R?[?_?[?̊w?K???????????Ă݂????Ǝv???܂??B???̉ߒ??ŁAGoogle Colab??GPU???g?????߂̐ݒ?APyTorch??GPU???g?????߂̃z???g?Ƀz???g?̊?b?????ɂ??Ċw??ł????܂??傤?B?Ȃ??A????̃R?[?h?????̃m?[?g?u?b?N?Ō??J???Ă??܂??B
Google Colab????GPU???g???ɂ?
?@PyTorch????GPU???g???ɂ́A???̑O??Google Colab????GPU???g????悤?ɂ??Ă????K?v??????܂??B?Ƃ????Ă??A?????Google Colab?́m?????^?C???n???j???[????m?????^?C???̕ύX?n??I?????邾???ł??B????ɂ??m?m?[?g?u?b?N?̐ݒ?n?_?C?A???O???\???????̂ŁA?m?n?[?h?E?F?A ?A?N?Z?????[?^?n?h???b?v?_?E???ŁmGPU?n??I?????܂??B?Ō?Ɂm?ۑ??n?{?^?????N???b?N?????GPU???g?????߂̐ݒ肪?ۑ?????܂??B
GPU???g????悤?Ƀm?[?g?u?b?N?̐ݒ??ύX????
?@?ȏ??GPU???g????悤?ɂȂ?܂????B?Ȃ??A?L???ł?Colab Pro?ł͂?荂????GPU??D??I?Ɏg????Ȃǂ̃????b?g??????܂????A?c?O?Ȃ??Ƃɓ??{?ł̐????ȃ????[?X?͂܂??s???Ă??Ȃ??悤?ł??B
?@?????Ɉȉ??̂悤?ȃR?[?h???????Ă݂܂??B
import torch
device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')
print(device)
?@??L?̐ݒ???s??Ȃ??܂܁A???̃R?[?h?????s????ƁA???̂悤?Ȏ??s???ʂƂȂ?܂??B?????torch.cuda.is_available???̖߂?l??False?ƂȂ邩??ł??B
?f?t?H???g?ł?GPU???g?킸??CPU???g???đS?Ă̏??????s?????@???????A?ݒ??ύX??????ɓ??l?ȃR?[?h?????s????A???̌??ʂ͎??̂悤?ɂȂ?܂??i?????^?C?????V?K?ɋN??????܂??j?B
GPU???g????悤?ɂȂ??????Ƃ???????PyTorch??GPU???g???ĉ??Z???Ă݂?
?@?????Google Colab????GPU???g?????????????܂????B???????A?{??̏?ݍ??݃I?[?g?G???R?[?_?[?̃R?[?h??GPU?ɑΉ???????O?ɁA?ȒP??PyTorch??GPU???g???????????s????{?????Ă????܂??傤?B
?@??قǂ????܂??????A???݂̊???GPU???g???邩?ǂ????̊m?F?ɂ́Atorch.cuda.is_available?????g???܂??B
print(torch.cuda.is_available()) # GPU???g????FTrue?A?g???Ȃ??FFalse
?@?Ƃ???ŁA??قǂ̃R?[?h?ł͎??̂悤?ȃR?[?h???????Ă??܂????B
device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')
?@????͉????Ӗ?????̂ł??傤?Btorch.device?̓e???\?????ǂ̃f?o?C?X?Ɋ??蓖?Ă?̂??iCPU??GPU???AGPU??????????Ƃ??ɂ͂ǂ?GPU???j??\???N???X?ł??B????āA???̃R?[?h??torch.cuda.is_available???Ăяo???̖߂?l?ɉ????āA'cuda:0'??'cpu'???????Ƃ???torch.device?I?u?W?F?N?g???쐬???Ă???Ƃ??????Ƃł??B
?@?????ł???????Ď??̂悤?ȃR?[?h?????s???Ă݂܂??傤?B
print(repr(torch.device('cuda:0')))
print(repr(torch.device('cpu')))
?@???̎??s???ʂ͎??̂悤?ɂȂ?܂??B
???s?????@?܂?A'cuda:0'???w?肵??torch.device?I?u?W?F?N?g???쐬????Ɓutype='cuda'?Aindex=0?v?Ƃ???device?I?u?W?F?N?g??????A'cpu'???w?肵?āutype='cpu'?v?Ƃ???device?I?u?W?F?N?g???????Ƃ??????Ƃł??B?O?҂̏ꍇ?Aindex??GPU?̃C???f?b?N?X??\???܂??B?C???f?b?N?X?͕?????GPU???g??????ł́A0?A1?A?c?c?̂悤?ɑ????Ă????܂??B?utorch.device('cuda')?v?̂悤?ɂ???A?f?t?H???g??GPU???w?肳?ꂽ???̂ƌ??Ȃ???܂??B
?@??????device?I?u?W?F?N?g?͍????q?ׂ??悤?ɁA?u?e???\???????蓖?Ă?f?o?C?X??\???v???̂ł??B?????̃e???\???ł???Ato???\?b?h?ɂ??̃I?u?W?F?N?g??n?????ƂŁA?Ή?????f?o?C?X?iCPU??GPU?j?ɂ??̓??e???]??????܂??B???ۂɎ????Ă݂܂??傤?B
x = torch.tensor([1, 2, 3])
x = x.to(torch.device('cuda:0')) # ?e???\????GPU0?ɓ]?????āA???̌??ʂ?x?ɑ??
print(x)
?@????????s????ƁA???̂悤?Ȍ??ʂ??????܂??B
?@????ɂ??A?ϐ?x?ɓ]???????e???\????GPU?i?C???f?b?N?X0?j?ɓ]??????܂????B???ӂ??ׂ??_?́Ato???\?b?h?̖߂?l???????̕ϐ??ɑ?????Ȃ???A????͎̂Ă??Ă??܂????Ƃł??B??̃R?[?h?ł́A?ϐ?x?ɑ?????????Ă??܂??B
?@??????A?d?v?Ȃ??Ƃ́u???鏈?????s???ɓ??????āA?K?v?ƂȂ?S?Ă̗v?f???????f?o?C?X??ɂȂ???Ȃ?Ȃ??v???Ƃł??B?܂?ACPU??Ɋ??蓖?Ă??Ă???e???\???ƁAGPU??Ɋ??蓖?Ă??Ă???e???\???Ƃ????Z????Ƃ????????Ƃ͂ł??܂???B
x = torch.tensor([1, 2, 3])
y = torch.tensor([3, 2, 1], device='cpu')
device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')
z = x.to(device) # GPU?ɓ]??
print(x + y) # tensor([4, 4, 4])
print(y + z) # ??O
?@???̃R?[?h?͂ł͂܂?2?̃e???\???i?ϐ?x??y?j?????????ɁAGPU???g?p?\???ǂ????ɍ??킹??torch.device?I?u?W?F?N?g???쐬???Ă??܂??B???̎??_??Google Colab???ł?GPU???g?p?ł???悤?ɐݒ?ς݂Ȃ̂ŁAdevice?I?u?W?F?N?g?̓e???\????GPU?Ɋ??蓖?Ă邱?Ƃ?\???Ă??܂??B?????āA???̃I?u?W?F?N?g??to???\?b?h?ɗ^???邱?ƂŁAGPU??Ɋ??蓖?Ă?ꂽ?e???\???i???̃e???\???̃R?s?[?j??ʂ̕ϐ?z?ɑ?????Ă??܂??B?Ō?ɓ????f?o?C?X?iCPU?j??ɂ???e???\?????Q?Ƃ??Ă???ϐ?x??y?A?ʂ̃f?o?C?X?iCPU??GPU?j??ɂ???e???\?????Q?Ƃ??Ă???ϐ?y??z?Ƃ????ꂼ????Z???悤?Ƃ??????̂ł??B
?@????????s???Ă݂?ƁA?R?????g?ɂ?????ʂ?A?ϐ?y??z?̉??Z?ŗ?O?????????܂??B
?@???̂??Ƃ??番????܂????A?j???[?????l?b?g???[?N???f???̊w?K??A?j???[?????l?b?g???[?N???f???𗘗p?????????ɂ????ẮA?K?v?Ȃ??̂?S?ē????f?o?C?X?ɓ]?????Ă????Ȃ???Ȃ?܂???B
?@??̓I?ɂ????AGPU???g???Ċw?K???s???ɂ͏d?݂ƃo?C?A?X???A???̓f?[?^?Ɖ??Z????āA???????x???Ɣ?r????܂??i???????x????????ꍇ?j?B????āA??????S?āA???O??GPU?ւƓ]?????Ă????K?v??????܂??B
?@?Ə????ƁA??????ς????ȋC?ɂȂ?܂????A???ۂɂ͂????ł?????܂???ł????B?Ƃ????킯?ŁA?O??̃R?[?h??GPU?ɑΉ???????R?[?h?????Ă݂邱?Ƃɂ??܂??傤?B
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