python_augmentation.py

import SimpleITK as sitk
from PIL import Image
import numpy as np
import time
import matplotlib.pyplot as plt

from cuda_backend.py_api import Handle
import deform

Iters = 500
Iters_CPU = 10
 
np.set_printoptions(precision=3)

def check(correct, output):
    '''
    Unit Test Pass When less than 0.01 rate pixels loss ( > 0.001)
    '''
    assert(correct.shape == output.shape)
    loss = np.abs(output - correct)
    count = np.sum(loss > 1e-3)
    max_loss = loss.max()
    total = loss.reshape(-1).shape[0]
    if count < 1e-2 * total:
        print("Unit_test Successful Pass")
        return True
    else:
        print("Unit_test Failed: Rate is {}, \n mean L1_loss is {} \n max L1_loss is {}".\
                     format(count / total, loss.mean(), loss.max()))
        test = output == correct
        import ipdb; ipdb.set_trace()
        return False

def test_3D():
    data_pth = 'data/FLAIR.nii.gz'
    sitk_image = sitk.ReadImage(data_pth)
    array_image = sitk.GetArrayFromImage(sitk_image).copy()

    cuda_handle = Handle(array_image.shape, mode="mirror")
    # cuda_handle.test()
    # cuda_handle.scale(0.5)
    # cuda_handle.flip(do_y=True, do_x=True, do_z=True)
    # cuda_handle.translate(100, 100, 20)
    cuda_handle.rotate(0.75 * np.pi, 0.75 * np.pi, 0.75 * np.pi)
    # cuda_handle.elastic(sigma=12., alpha=200., mode='constant')
    cuda_handle.end_flag()

    correct_ret = deform.spatial_augment(array_image, mode="mirror")
    # Warm up and Unit test
    for i in range(100):
        output = cuda_handle.augment(array_image, order=0)
    check(correct_ret, output[0])

    start = time.time()
    for i in range(Iters):
        output = cuda_handle.augment(array_image)
    end = time.time()
    print("Shape:{} Augmentation On CUDA Cost {}ms".format(array_image.shape, \
                                    (end - start) * 1000 / Iters))

    start = time.time()
    for i in range(Iters_CPU):
        correct_ret = deform.spatial_augment(array_image)
    end = time.time()
    print("Shape:{} Augmentation On CPU Cost {}ms".format(array_image.shape, \
                                    (end - start) * 1000 / Iters_CPU))

def test_2D():

    data_pth = 'data/Daenerys.jpg'
    image = Image.open(data_pth)
    array_image = np.array(image)
    raw = array_image
    array_image = array_image.transpose(2,0,1).astype(np.float32).copy()

    cuda_handle = Handle(array_image.shape, RGB=True, mode='reflect')
    # cuda_handle.scale(0.5)
    # cuda_handle.flip(do_y=True)
    # cuda_handle.translate(400, 400)
    # cuda_handle.rotate(0.75 * np.pi)
    cuda_handle.elastic(sigma=12., alpha=200., mode='constant')
    cuda_handle.end_flag()

    # if len(array_image.shape) == 2:
    #     correct_ret = deform.spatial_augment(array_image)
    # else:
    #     correct_ret = np.zeros_like(array_image)
    #     for i in range(3):
    #         correct_ret[i] = deform.spatial_augment(array_image[i])

    # Warm up and Unit test
    for i in range(100):
        output = cuda_handle.augment(array_image)
        # import ipdb; ipdb.set_trace()
    # check(correct_ret, output[0])
   
    # Save Image
    name, image_type = data_pth.split('.')
    for item in output[1]:
        name += '_' + item
    output_pth = name + '.' + image_type
    out = Image.fromarray(output[0].transpose(1, 2, 0), mode=image.mode)
    out = Image.fromarray(output[0].transpose(1, 2, 0).\
                                    astype(raw.dtype), mode=image.mode)
    out.save(output_pth)
    # import ipdb; ipdb.set_trace()

    # Test Time
    start = time.time()
    for i in range(Iters):
        output = cuda_handle.augment(array_image)
    end = time.time()
    print("Shape:{} Augmentation On CUDA Cost {}ms".format(array_image.shape, \
                                    (end - start) * 1000 / Iters))

    # start = time.time()
    # for i in range(Iters_CPU):
    #     if len(array_image.shape) == 2:
    #         correct_ret = deform.spatial_augment(array_image)
    #     else:
    #         correct_ret = np.zeros_like(array_image)
    #         for i in range(3):
    #             correct_ret[i] = deform.spatial_augment(array_image[i])
    # end = time.time()
    # print("Shape:{} Augmentation On CPU Cost {}ms".format(array_image.shape, \
    #                                 (end - start) * 1000 / Iters_CPU)) 

if __name__ == "__main__":
    test_3D()
    # test_2D()