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import os.path
from glob import glob
from typing import cast
import torch
from torch.types import Storage
# because get_storage_from_record returns a tensor!?
class _HasStorage(object):
def __init__(self, storage):
self._storage = storage
def storage(self):
return self._storage
class DirectoryReader(object):
"""
Class to allow PackageImporter to operate on unzipped packages. Methods
copy the behavior of the internal PyTorchFileReader class (which is used for
accessing packages in all other cases).
N.B.: ScriptObjects are not depickleable or accessible via this DirectoryReader
class due to ScriptObjects requiring an actual PyTorchFileReader instance.
"""
def __init__(self, directory):
self.directory = directory
def get_record(self, name):
filename = f"{self.directory}/{name}"
with open(filename, "rb") as f:
return f.read()
def get_storage_from_record(self, name, numel, dtype):
filename = f"{self.directory}/{name}"
nbytes = torch._utils._element_size(dtype) * numel
storage = cast(Storage, torch.UntypedStorage)
return _HasStorage(storage.from_file(filename=filename, nbytes=nbytes))
def has_record(self, path):
full_path = os.path.join(self.directory, path)
return os.path.isfile(full_path)
def get_all_records(
self,
):
files = []
for filename in glob(f"{self.directory}/**", recursive=True):
if not os.path.isdir(filename):
files.append(filename[len(self.directory) + 1 :])
return files
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