Pytorch GPU 예제 코드 (example)

Pytorch(torch) 셋팅 후에,
간단하게 GPU 가 잘 돌아가는지 예제코드를 구하고 싶을때 막상 검색하면 좀 헤비한것들만 검색되는 경우가 있음.

 

아래 코드는 라이트하게 GPU 작동하는지 테스트 해보기에 좋음.
제일 첫줄에 pytorch version 출력 후, 간단한 GPU 연산 시도하는 코드 임.

 

import torch
import math

print(torch.__version__) # torch version 출력

dtype = torch.float
# device = torch.device("cpu")
device = torch.device("cuda") # Uncomment this to run on GPU, GPU 를 사용하므로 해당 라인 실행

# Create random input and output data
x = torch.linspace(-math.pi, math.pi, 2000, device=device, dtype=dtype)
y = torch.sin(x)

# Randomly initialize weights
a = torch.randn((), device=device, dtype=dtype)
b = torch.randn((), device=device, dtype=dtype)
c = torch.randn((), device=device, dtype=dtype)
d = torch.randn((), device=device, dtype=dtype)

learning_rate = 1e-6
for t in range(2000):
    # Forward pass: compute predicted y
    y_pred = a + b * x + c * x ** 2 + d * x ** 3

    # Compute and print loss
    loss = (y_pred - y).pow(2).sum().item()
    if t % 100 == 99:
        print(t, loss)

    # Backprop to compute gradients of a, b, c, d with respect to loss
    grad_y_pred = 2.0 * (y_pred - y)
    grad_a = grad_y_pred.sum()
    grad_b = (grad_y_pred * x).sum()
    grad_c = (grad_y_pred * x ** 2).sum()
    grad_d = (grad_y_pred * x ** 3).sum()

    # Update weights using gradient descent
    a -= learning_rate * grad_a
    b -= learning_rate * grad_b
    c -= learning_rate * grad_c
    d -= learning_rate * grad_d


print(f'Result: y = {a.item()} + {b.item()} x + {c.item()} x^2 + {d.item()} x^3')