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Experimenting with triplet loss embeddings.
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| import numpy as np | |
| def build_rainbow(n, curve=None): | |
| rgb = [] | |
| width = 2 * np.pi | |
| for i in range(3): | |
| offset = -i * width / 3 | |
| cur = np.cos(np.linspace(offset, offset + width, n)) | |
| rgb.append(cur) | |
| rainbow = (1 + np.vstack(rgb)) / 2 | |
| if curve: | |
| rainbow = curve(rainbow) | |
| rainbow = np.minimum(rainbow * 256, 255).astype(int) | |
| return rainbow.T |
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| import numpy as np | |
| def map_range(x, in_min, in_max, out_min, out_max): | |
| return out_min + (out_max - out_min) * (x - in_min) / (in_max - in_min) | |
| def plot_images(images, xy, blend=np.maximum, canvas_shape=(512,512), fill=0): | |
| h,w = images.shape[1:3] | |
| if images.ndim == 4: | |
| canvas_shape = (canvas_shape[0], canvas_shape[1], images.shape[3]) | |
| min_xy = np.amin(xy, 0) | |
| max_xy = np.amax(xy, 0) | |
| min_canvas = np.array((0, 0)) | |
| max_canvas = np.array((canvas_shape[0] - h, canvas_shape[1] - w)) | |
| canvas = np.full(canvas_shape, fill) | |
| for image, pos in zip(images, xy): | |
| x_off, y_off = map_range(pos, min_xy, max_xy, min_canvas, max_canvas).astype(int) | |
| sub_canvas = canvas[y_off:y_off+h, x_off:x_off+w] | |
| sub_image = image[:h, :w] | |
| canvas[y_off:y_off+h, x_off:x_off+w] = blend(sub_canvas, sub_image) | |
| return canvas |
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| try: # Python 2 | |
| from cStringIO import StringIO as BytesIO | |
| except: # Python 3 | |
| from io import BytesIO | |
| import numpy as np | |
| import PIL.Image | |
| import IPython.display | |
| import shutil | |
| from math import sqrt | |
| def show_array(a, fmt='png', filename=None, retina=False, zoom=None): | |
| if len(a.shape) == 1: | |
| n = len(a) | |
| side = int(sqrt(n)) | |
| if (side * side) == n: | |
| a = a.reshape(side, side) | |
| else: | |
| raise ValueError('input is one-dimensional', a.shape) | |
| a = np.uint8(np.clip(a, 0, 255)) | |
| image_data = BytesIO() | |
| PIL.Image.fromarray(a).save(image_data, fmt) | |
| if filename is None: | |
| height, width = a.shape[:2] | |
| if zoom is not None: | |
| width *= zoom | |
| height *= zoom | |
| IPython.display.display(IPython.display.Image(data=image_data.getvalue(), | |
| width=width, | |
| height=height, | |
| retina=retina)) | |
| else: | |
| with open(filename, 'wb') as f: | |
| image_data.seek(0) | |
| shutil.copyfileobj(image_data, f) |
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