def extract_bower_zipfile(self, zip_file, dest, expected_version=None):
        bower_json = None
        root = None
        deps_installed = []
        for info in zip_file.infolist():
            if PurePath(info.filename).name == "bower.json":
                with zip_file.open(info) as f:
                    bower_json = json.load(f)
                    root = str(PurePath(info.filename).parent)
                break
        version = bower_json["version"]
        if expected_version is not None:
            expected_version = Bower.clean_semver(expected_version)
            if not semver.match(version, expected_version):
                click.secho("error: versions do not match ({} =/= {})".format(
                    version, expected_version))
                raise InvalidPackageError
        if "dependencies" in bower_json:
            for package, version in bower_json["dependencies"].items():
                url = Bower.get_package_url(package)
                deps_installed.extend(self.get_bower_package(
                    url, dest=dest, version=version))
        ignore_patterns = [GitIgnorePattern(ig) for ig in bower_json["ignore"]]
        path_spec = PathSpec(ignore_patterns)
        namelist = [path for path in zip_file.namelist()
                    if PurePath(path).parts[0] == root]
        ignored = list(path_spec.match_files(namelist))
        for path in namelist:
            dest_path = PurePath(
                bower_json["name"],
                *PurePath(path).parts[1:])

            if path in ignored:
                continue

            for path in ignored:
                for parent in PurePath(path):
                    if parent in ignored:
                        continue

            if path.endswith("/"):
                if list(path_spec.match_files([str(dest_path)])):
                    ignored.append(PurePath(path))
                elif not (dest / dest_path).is_dir():
                    (dest / dest_path).mkdir(parents=True)
            else:
                target_path = dest / dest_path.parent / dest_path.name
                source = zip_file.open(path)
                target = target_path.open("wb")
                with source, target:
                    shutil.copyfileobj(source, target)
        deps_installed.append((bower_json["name"], bower_json["version"]))
        return deps_installed
def __init__(self, root, split="train", pass_name="clean", camera="left", transforms=None):
        super().__init__(root=root, transforms=transforms)

        verify_str_arg(split, "split", valid_values=("train", "test"))
        split = split.upper()

        verify_str_arg(pass_name, "pass_name", valid_values=("clean", "final", "both"))
        passes = {
            "clean": ["frames_cleanpass"],
            "final": ["frames_finalpass"],
            "both": ["frames_cleanpass", "frames_finalpass"],
        }[pass_name]

        verify_str_arg(camera, "camera", valid_values=("left", "right", "both"))
        cameras = ["left", "right"] if camera == "both" else [camera]

        root = Path(root) / "FlyingThings3D"

        directions = ("into_future", "into_past")
        for pass_name, camera, direction in itertools.product(passes, cameras, directions):
            image_dirs = sorted(glob(str(root / pass_name / split / "*/*")))
            image_dirs = sorted(Path(image_dir) / camera for image_dir in image_dirs)

            flow_dirs = sorted(glob(str(root / "optical_flow" / split / "*/*")))
            flow_dirs = sorted(Path(flow_dir) / direction / camera for flow_dir in flow_dirs)

            if not image_dirs or not flow_dirs:
                raise FileNotFoundError(
                    "Could not find the FlyingThings3D flow images. "
                    "Please make sure the directory structure is correct."
                )

            for image_dir, flow_dir in zip(image_dirs, flow_dirs):
                images = sorted(glob(str(image_dir / "*.png")))
                flows = sorted(glob(str(flow_dir / "*.pfm")))
                for i in range(len(flows) - 1):
                    if direction == "into_future":
                        self._image_list += [[images[i], images[i + 1]]]
                        self._flow_list += [flows[i]]
                    elif direction == "into_past":
                        self._image_list += [[images[i + 1], images[i]]]
                        self._flow_list += [flows[i + 1]]