82 lines
2.7 KiB
Python
82 lines
2.7 KiB
Python
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# This code provides the class that is used to generate backgrounds for the natural background setting
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# the class is used inside an environment wrapper and will be called each time the env generates an observation
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# the code is largely based on https://github.com/facebookresearch/deep_bisim4control
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import random
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import cv2
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import numpy as np
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import skvideo.io
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class ImageSource(object):
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"""
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Source of natural images to be added to a simulated environment.
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"""
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def get_image(self):
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"""
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Returns:
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an RGB image of [h, w, 3] with a fixed shape.
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"""
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pass
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def reset(self):
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""" Called when an episode ends. """
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pass
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class RandomVideoSource(ImageSource):
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def __init__(self, shape, filelist, random_bg=False, max_videos=100, grayscale=False):
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"""
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Args:
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shape: [h, w]
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filelist: a list of video files
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"""
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self.grayscale = grayscale
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self.shape = shape
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self.filelist = filelist
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random.shuffle(self.filelist)
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self.filelist = self.filelist[:max_videos]
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self.max_videos = max_videos
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self.random_bg = random_bg
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self.current_idx = 0
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self._current_vid = None
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self.reset()
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def load_video(self, vid_id):
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fname = self.filelist[vid_id]
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if self.grayscale:
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frames = skvideo.io.vread(fname, outputdict={"-pix_fmt": "gray"})
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else:
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frames = skvideo.io.vread(fname, num_frames=1000)
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img_arr = np.zeros((frames.shape[0], self.shape[0], self.shape[1]) + ((3,) if not self.grayscale else (1,)))
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for i in range(frames.shape[0]):
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if self.grayscale:
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img_arr[i] = cv2.resize(frames[i], (self.shape[1], self.shape[0]))[..., None] # THIS IS NOT A BUG! cv2 uses (width, height)
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else:
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img_arr[i] = cv2.resize(frames[i], (self.shape[1], self.shape[0]))
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return img_arr
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def reset(self):
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del self._current_vid
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self._video_id = np.random.randint(0, len(self.filelist))
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self._current_vid = self.load_video(self._video_id)
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while True:
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try:
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self._video_id = np.random.randint(0, len(self.filelist))
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self._current_vid = self.load_video(self._video_id)
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break
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except Exception:
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continue
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self._loc = np.random.randint(0, len(self._current_vid))
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def get_image(self):
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if self.random_bg:
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self._loc = np.random.randint(0, len(self._current_vid))
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else:
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self._loc += 1
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img = self._current_vid[self._loc % len(self._current_vid)]
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return img
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