remove unused dataset_mapper.py

Summary: fbgs register_uri_image_loader, UniversalResourceLoader, _IMAGE_LOADER_REGISTRY returns no results other than this file

Reviewed By: newstzpz

Differential Revision: D27639902

fbshipit-source-id: 52e3bb77dbb547334938b8537d6e1c173405d12d

d2go/data/dataset_mapper.py

-#!/usr/bin/env python3
-# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
-
-
-import copy
-import logging
-
-# TODO: Deprecate this file in favor of the module detectron2go.data.dataset_mappers
-from d2go.data.dataset_mappers import D2GoDatasetMapper  # noqa
-from PIL import Image
-
-
-logger = logging.getLogger(__name__)
-
-
-_IMAGE_LOADER_REGISTRY = {}
-
-
-def register_uri_image_loader(scheme, loader):
-    """
-    Image can be represented as "scheme://path", image will be retrived by calling
-        Image.open(loader(path)).
-    """
-    logger.info(
-        "Register image loader for scheme: {} with loader: {}".format(scheme, loader)
-    )
-    _IMAGE_LOADER_REGISTRY[scheme] = loader
-
-
-# TODO (T62922909): remove UniversalResourceLoader and use PathManager
-class UniversalResourceLoader(object):
-    def __init__(self):
-        self._image_loader_func_map = copy.deepcopy(_IMAGE_LOADER_REGISTRY)
-
-    @staticmethod
-    def parse_path(uri):
-        SCHEME_SEPARATOR = "://"
-        if uri.count(SCHEME_SEPARATOR) < 1:
-            # this should be a normal file name, use full string as path
-            return "file", uri
-
-        scheme, path = uri.split(SCHEME_SEPARATOR, maxsplit=1)
-        return scheme, path
-
-    def get_file(self, uri):
-        scheme, path = self.parse_path(uri)
-        if scheme not in self._image_loader_func_map:
-            raise RuntimeError(
-                "No loader for scheme {} in UniversalResourceLoader for uri: {}".format(
-                    scheme, uri
-                )
-            )
-
-        loader = self._image_loader_func_map[scheme]
-        return loader(path)
-
-    def support(self, dataset_dict):
-        uri = dataset_dict["file_name"]
-        scheme, _ = self.parse_path(uri)
-        return scheme in self._image_loader_func_map
-
-    def __call__(self, dataset_dict):
-        uri = dataset_dict["file_name"]
-        fp = self.get_file(uri)
-        return Image.open(fp)
-
-    def __repr__(self):
-        return "UniversalResourceLoader(schemes={})".format(
-            list(self._image_loader_func_map.keys())
-        )