def test_pretrained(self):
# Load efficientdet pretrained on VOC2007
model = EfficientDet.from_pretrained('D0-VOC', score_threshold=.6)
print('Done loading...')
image = io.load_image('test/data/VOC2007/JPEGImages/000002.jpg',
(model.config.input_size, ) * 2)
n_image = normalize_image(image)
n_image = tf.expand_dims(n_image, axis=0)
classes = voc.IDX_2_LABEL
boxes, labels, scores = model(n_image, training=False)
labels = [classes[l] for l in labels[0]]
im = image.numpy()
for l, box, s in zip(labels, boxes[0].numpy(), scores[0]):
x1, y1, x2, y2 = box.astype('int32')
cv2.rectangle(im, (x1, y1), (x2, y2), (0, 255, 0), 2)
cv2.putText(im, l + ' {:.2f}'.format(s), (x1, y1 - 10),
cv2.FONT_HERSHEY_PLAIN, 2, (0, 255, 0), 2)
plt.imshow(im)
plt.axis('off')
plt.savefig('test.png')
plt.show(block=True)
def test_keras_pretrained(self):
# Load efficientdet pretrained on VOC2007
model = EfficientDet(D=0,
num_classes=20,
weights='D0-VOC',
score_threshold=.4)
print('Done loading...')
image = io.load_image('imgs/cat-dog.jpg', model.config.input_size)
n_image = normalize_image(image)
n_image = tf.expand_dims(n_image, axis=0)
classes = voc.IDX_2_LABEL
boxes, labels, scores = model(n_image, training=False)
labels = [classes[l] for l in labels[0]]
colors = visualizer.colors_per_labels(labels)
im = visualizer.draw_boxes(image,
boxes[0],
labels,
scores[0],
colors=colors)
plt.imshow(im)
plt.axis('off')
plt.savefig('test.png')
plt.show(block=True)
def _load_labelme_instance(
images_base_path: Union[str, Path],
annot_path: Union[str, Path],
im_input_size: Tuple[int, int],
class2idx: Mapping[str, int]) -> ObjectDetectionInstance:
# Reads a labelme annotation and returns
# a list of tuples containing the ground
# truth boxes and its respective label
with Path(annot_path).open() as f:
annot = json.load(f)
bbs = []
labels = []
image_path = Path(images_base_path) / annot['imagePath']
image = io_utils.load_image(str(image_path),
im_input_size,
normalize_image=True)
w, h = annot['imageWidth'], annot['imageHeight']
for shape in annot['shapes']:
shape_type = shape['shape_type']
if shape_type == 'rectangle':
points = _load_bbox_from_rectangle(shape['points'])
elif shape_type == 'polygon':
points = _load_bbox_from_polygon(shape['points'])
else:
raise ValueError(
f'Unexpected shape type: {shape_type} in file {annot_path}')
label = shape['label']
bbs.append(points)
labels.append(class2idx[label])
boxes = tf.stack(bbs)
boxes = bb_utils.normalize_bndboxes(boxes, (h, w))
return image, (tf.stack(labels), boxes)
def build_dataset(dataset_path: Union[str, Path],
im_input_size: Tuple[int, int],
shuffle: bool = True) -> tf.data.Dataset:
"""
Create model input pipeline using tensorflow datasets
Parameters
----------
dataset_path: Union[Path, str]
Path to the voc2007 dataset. The dataset path should contain
two subdirectories, one called images and another one called
annots
im_input_size: Tuple[int, int]
Model input size. Images will automatically be resized to this
shape
data_augmentation: bool, default False
Wether or not to apply data augmentation
Examples
--------
>>> ds = build_dataset('data/VOC2007', im_input_size=(128, 128))
>>> for image, (labels, bbs) in ds.take(1):
... print(image.shape)
... print(labels, bbs.shape)
...
(128, 128, 3)
([1, 13], (2, 4))
Returns
-------
tf.data.Dataset
"""
dataset_path = Path(dataset_path)
im_path = dataset_path / 'JPEGImages'
annot_path = dataset_path / 'Annotations'
# List sorted annotation files
annot_files = sorted(annot_path.glob('*.xml'))
# Partially evaluate image loader to resize images
# always with the same shape and normalize them
load_im = lambda im, annots: (io_utils.load_image(im, im_input_size,
normalize_image=True),
annots)
scale_boxes = partial(_scale_boxes, to_size=im_input_size)
# We assume that tf datasets list files sorted when shuffle=False
im_ds = tf.data.Dataset.list_files(str(im_path / '*.jpg'), shuffle=False)
annot_ds = (tf.data.Dataset
.from_generator(generator=lambda: _annot_gen(annot_files),
output_types=(tf.int32, tf.float32))
.map(scale_boxes))
# Join both datasets
ds = tf.data.Dataset.zip((im_ds, annot_ds))
# Shuffle before loading the images
if shuffle:
ds = ds.shuffle(1024)
ds = ds.map(load_im)
return ds
from efficientdet.data.voc import IDX_2_LABEL
import tensorflow as tf
# In[3]:
model = EfficientDet.from_pretrained('D0-VOC', score_threshold=.3)
image_size = model.config.input_size
# In[4]:
image = load_image('sample.jpg', image_size)
image.shape
# In[ ]:
n_image = preprocess.normalize_image(image)
n_image = tf.expand_dims(n_image, 0)
# In[ ]:
predictions = model(n_image, training=False)
boxes, labels, scores = predictions
