Squashed commit of the following: (Lightning-AI#2164)

commit 29fb0506cd38a15c359e369cc8bc4435916b0c78
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 19:35:30 2020 +0000

    fix checking for version for docs to build

commit 467fd64
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 18:56:05 2020 +0000

    remove no local test

commit a7cc9f8
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 18:46:44 2020 +0000

    fix

commit 3fdbb72
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 18:23:30 2020 +0000

    revert requirements

commit 9b8686b
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 18:16:42 2020 +0000

    make it a fixture

commit eec7495
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 18:01:32 2020 +0000

    fix up the testing

commit 896d94a
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 17:47:28 2020 +0000

    fix some tests

commit 6d22bde
Merge: 6175d4e 6ebe0d7
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Sat Aug 8 10:20:47 2020 +0000

    Merge remote-tracking branch 'origin/master' into tb_use_gfile

commit 6175d4e
Author: Brendan Fahy <bmfahy@gmail.com>
Date:   Fri Aug 7 10:16:36 2020 +0000

    Use tensorboard.compat.gfile to support remote writing

Author: f4hy

pytorch_lightning/callbacks/model_checkpoint.py

@@ -16,6 +16,7 @@
 from pytorch_lightning import _logger as log
 from pytorch_lightning.callbacks.base import Callback
 from pytorch_lightning.utilities import rank_zero_warn, rank_zero_only
+from pytorch_lightning.utilities.cloud_io import gfile, makedirs
 
 
 class ModelCheckpoint(Callback):
@@ -104,7 +105,9 @@ def __init__(self, filepath: Optional[str] = None, monitor: str = 'val_loss', ve
                  save_last: bool = False, save_top_k: int = 1, save_weights_only: bool = False,
                  mode: str = 'auto', period: int = 1, prefix: str = ''):
         super().__init__()
-        if save_top_k > 0 and filepath is not None and os.path.isdir(filepath) and len(os.listdir(filepath)) > 0:
+        if(filepath):
+            filepath = str(filepath)  # the tests pass in a py.path.local but we want a str
+        if save_top_k > 0 and filepath is not None and gfile.isdir(filepath) and len(gfile.listdir(filepath)) > 0:
             rank_zero_warn(
                 f"Checkpoint directory {filepath} exists and is not empty with save_top_k != 0."
                 "All files in this directory will be deleted when a checkpoint is saved!"
@@ -116,12 +119,13 @@ def __init__(self, filepath: Optional[str] = None, monitor: str = 'val_loss', ve
         if filepath is None:  # will be determined by trainer at runtime
             self.dirpath, self.filename = None, None
         else:
-            if os.path.isdir(filepath):
+            if gfile.isdir(filepath):
                 self.dirpath, self.filename = filepath, '{epoch}'
             else:
                 filepath = os.path.realpath(filepath)
                 self.dirpath, self.filename = os.path.split(filepath)
-            os.makedirs(self.dirpath, exist_ok=True)
+            if not gfile.exists(self.dirpath):
+                makedirs(self.dirpath)
         self.save_last = save_last
         self.save_top_k = save_top_k
         self.save_weights_only = save_weights_only
@@ -163,16 +167,23 @@ def kth_best_model(self):
         return self.kth_best_model_path
 
     def _del_model(self, filepath):
-        if os.path.isfile(filepath):
-            os.remove(filepath)
+        if gfile.exists(filepath):
+            try:
+                # in compat mode, remove is not implemented so if running this
+                # against an actual remove file system and the correct remote
+                # dependencies exist then this will work fine.
+                gfile.remove(filepath)
+            except AttributeError:
+                os.remove(filepath)
 
     def _save_model(self, filepath, trainer, pl_module):
 
         # in debugging, track when we save checkpoints
         trainer.dev_debugger.track_checkpointing_history(filepath)
 
         # make paths
-        os.makedirs(os.path.dirname(filepath), exist_ok=True)
+        if not gfile.exists(os.path.dirname(filepath)):
+            makedirs(os.path.dirname(filepath))
 
         # delegate the saving to the model
         if self.save_function is not None:
@@ -308,7 +319,7 @@ def on_validation_end(self, trainer, pl_module):
 
         filepath = self.format_checkpoint_name(epoch, metrics)
         version_cnt = 0
-        while os.path.isfile(filepath):
+        while gfile.exists(filepath):
             filepath = self.format_checkpoint_name(epoch, metrics, ver=version_cnt)
             # this epoch called before
             version_cnt += 1

pytorch_lightning/core/saving.py

@@ -11,6 +11,7 @@
 from pytorch_lightning import _logger as log
 from pytorch_lightning.utilities import rank_zero_warn, AttributeDict
 from pytorch_lightning.utilities.cloud_io import load as pl_load
+from pytorch_lightning.utilities.cloud_io import gfile, cloud_open
 
 PRIMITIVE_TYPES = (bool, int, float, str)
 ALLOWED_CONFIG_TYPES = (AttributeDict, MutableMapping, Namespace)
@@ -273,30 +274,30 @@ def load_hparams_from_tags_csv(tags_csv: str) -> Dict[str, Any]:
     True
     >>> os.remove(path_csv)
     """
-    if not os.path.isfile(tags_csv):
-        rank_zero_warn(f'Missing Tags: {tags_csv}.', RuntimeWarning)
+    if not gfile.exists(tags_csv):
+        rank_zero_warn(f"Missing Tags: {tags_csv}.", RuntimeWarning)
         return {}
 
-    with open(tags_csv) as fp:
-        csv_reader = csv.reader(fp, delimiter=',')
+    with cloud_open(tags_csv, "r", newline="") as fp:
+        csv_reader = csv.reader(fp, delimiter=",")
         tags = {row[0]: convert(row[1]) for row in list(csv_reader)[1:]}
 
     return tags
 
 
 def save_hparams_to_tags_csv(tags_csv: str, hparams: Union[dict, Namespace]) -> None:
-    if not os.path.isdir(os.path.dirname(tags_csv)):
-        raise RuntimeError(f'Missing folder: {os.path.dirname(tags_csv)}.')
+    if not gfile.isdir(os.path.dirname(tags_csv)):
+        raise RuntimeError(f"Missing folder: {os.path.dirname(tags_csv)}.")
 
     if isinstance(hparams, Namespace):
         hparams = vars(hparams)
 
-    with open(tags_csv, 'w', newline='') as fp:
-        fieldnames = ['key', 'value']
+    with cloud_open(tags_csv, "w", newline="") as fp:
+        fieldnames = ["key", "value"]
         writer = csv.DictWriter(fp, fieldnames=fieldnames)
-        writer.writerow({'key': 'key', 'value': 'value'})
+        writer.writerow({"key": "key", "value": "value"})
         for k, v in hparams.items():
-            writer.writerow({'key': k, 'value': v})
+            writer.writerow({"key": k, "value": v})
 
 
 def load_hparams_from_yaml(config_yaml: str) -> Dict[str, Any]:
@@ -310,11 +311,11 @@ def load_hparams_from_yaml(config_yaml: str) -> Dict[str, Any]:
     True
     >>> os.remove(path_yaml)
     """
-    if not os.path.isfile(config_yaml):
-        rank_zero_warn(f'Missing Tags: {config_yaml}.', RuntimeWarning)
+    if not gfile.exists(config_yaml):
+        rank_zero_warn(f"Missing Tags: {config_yaml}.", RuntimeWarning)
         return {}
 
-    with open(config_yaml) as fp:
+    with cloud_open(config_yaml, "r") as fp:
         tags = yaml.load(fp)
 
     return tags
@@ -326,11 +327,12 @@ def save_hparams_to_yaml(config_yaml, hparams: Union[dict, Namespace]) -> None:
         config_yaml: path to new YAML file
         hparams: parameters to be saved
     """
-    if not os.path.isdir(os.path.dirname(config_yaml)):
-        raise RuntimeError(f'Missing folder: {os.path.dirname(config_yaml)}.')
+    if not gfile.isdir(os.path.dirname(config_yaml)):
+        raise RuntimeError(f"Missing folder: {os.path.dirname(config_yaml)}.")
 
     if OMEGACONF_AVAILABLE and isinstance(hparams, Container):
         from omegaconf import OmegaConf
+
         OmegaConf.save(hparams, config_yaml, resolve=True)
         return
 
@@ -341,7 +343,7 @@ def save_hparams_to_yaml(config_yaml, hparams: Union[dict, Namespace]) -> None:
         hparams = dict(hparams)
     assert isinstance(hparams, dict)
 
-    with open(config_yaml, 'w', newline='') as fp:
+    with cloud_open(config_yaml, "w", newline="") as fp:
         yaml.dump(hparams, fp)
 
 

pytorch_lightning/loggers/tensorboard.py

@@ -16,6 +16,7 @@
 from pytorch_lightning.core.saving import save_hparams_to_yaml
 from pytorch_lightning.loggers.base import LightningLoggerBase, rank_zero_experiment
 from pytorch_lightning.utilities import rank_zero_only
+from pytorch_lightning.utilities.cloud_io import gfile, makedirs
 
 try:
     from omegaconf import Container, OmegaConf
@@ -109,7 +110,8 @@ def experiment(self) -> SummaryWriter:
             return self._experiment
 
         assert rank_zero_only.rank == 0, 'tried to init log dirs in non global_rank=0'
-        os.makedirs(self.root_dir, exist_ok=True)
+        if self.root_dir and not gfile.exists(str(self.root_dir)):
+            makedirs(self.root_dir)
         self._experiment = SummaryWriter(log_dir=self.log_dir, **self._kwargs)
         return self._experiment
 
@@ -162,7 +164,7 @@ def log_metrics(self, metrics: Dict[str, float], step: Optional[int] = None) ->
     def save(self) -> None:
         super().save()
         dir_path = self.log_dir
-        if not os.path.isdir(dir_path):
+        if not gfile.isdir(dir_path):
             dir_path = self.save_dir
 
         # prepare the file path
@@ -188,13 +190,13 @@ def version(self) -> int:
     def _get_next_version(self):
         root_dir = os.path.join(self.save_dir, self.name)
 
-        if not os.path.isdir(root_dir):
+        if not gfile.isdir(root_dir):
             log.warning('Missing logger folder: %s', root_dir)
             return 0
 
         existing_versions = []
-        for d in os.listdir(root_dir):
-            if os.path.isdir(os.path.join(root_dir, d)) and d.startswith("version_"):
+        for d in gfile.listdir(root_dir):
+            if gfile.isdir(os.path.join(root_dir, d)) and d.startswith("version_"):
                 existing_versions.append(int(d.split("_")[1]))
 
         if len(existing_versions) == 0:

pytorch_lightning/trainer/training_io.py

@@ -104,6 +104,7 @@
 )
 from pytorch_lightning.utilities import rank_zero_warn, AMPType
 from pytorch_lightning.utilities.cloud_io import load as pl_load
+from pytorch_lightning.utilities.cloud_io import gfile, makedirs
 
 try:
     import torch_xla
@@ -407,9 +408,9 @@ def restore_hpc_weights_if_needed(self, model: LightningModule):
         did_restore = False
 
         # look for hpc weights
-        folderpath = self.weights_save_path
-        if os.path.exists(folderpath):
-            files = os.listdir(folderpath)
+        folderpath = str(self.weights_save_path)
+        if gfile.exists(folderpath):
+            files = gfile.listdir(folderpath)
             hpc_weight_paths = [x for x in files if 'hpc_ckpt' in x]
 
             # if hpc weights exist restore model
@@ -488,15 +489,17 @@ def restore_training_state(self, checkpoint):
     # ----------------------------------
     def hpc_save(self, folderpath: str, logger):
         # make sure the checkpoint folder exists
-        os.makedirs(folderpath, exist_ok=True)
+        folderpath = str(folderpath)  # because the tests pass a path object
+        if not gfile.exists(folderpath):
+            makedirs(folderpath)
 
         # save logger to make sure we get all the metrics
         logger.save()
 
         ckpt_number = self.max_ckpt_in_folder(folderpath) + 1
 
-        if not os.path.exists(folderpath):
-            os.makedirs(folderpath, exist_ok=True)
+        if not gfile.exists(folderpath):
+            makedirs(folderpath)
         filepath = os.path.join(folderpath, f'hpc_ckpt_{ckpt_number}.ckpt')
 
         # give model a chance to do something on hpc_save
@@ -549,7 +552,7 @@ def hpc_load(self, folderpath, on_gpu):
         log.info(f'restored hpc model from: {filepath}')
 
     def max_ckpt_in_folder(self, path, name_key='ckpt_'):
-        files = os.listdir(path)
+        files = gfile.listdir(str(path))
         files = [x for x in files if name_key in x]
         if len(files) == 0:
             return 0

pytorch_lightning/utilities/cloud_io.py

@@ -1,11 +1,65 @@
+import sys
+import os
+from typing import Union
 from pathlib import Path
 from urllib.parse import urlparse
-
 import torch
 
+import tensorboard
+from packaging import version
+from pytorch_lightning import _logger as log
+
+# we want this for tf.io.gfile, which if tf is installed gives full tf,
+# otherwise gives a pruned down version which works for some file backends but
+# not all
+from tensorboard.compat import tf
+
+gfile = tf.io.gfile
+
+pathlike = Union[Path, str]
+
+# older version of tensorboard had buggy gfile compatibility layers
+# only support remote cloud paths if newer
+
 
 def load(path_or_url: str, map_location=None):
     if urlparse(path_or_url).scheme == '' or Path(path_or_url).drive:  # no scheme or with a drive letter
         return torch.load(path_or_url, map_location=map_location)
-    else:
-        return torch.hub.load_state_dict_from_url(path_or_url, map_location=map_location)
+    return torch.hub.load_state_dict_from_url(path_or_url, map_location=map_location)
+
+
+def modern_gfile():
+    """Check the version number of tensorboard.
+
+    Cheking to see if it has the gfile compatibility layers needed for remote
+    file operations
+    """
+    tb_version = version.parse(tensorboard.version.VERSION)
+    modern_gfile = tb_version >= version.parse('2.0')
+
+
+def cloud_open(path: pathlike, mode: str, newline:str = None):
+    if sys.platform == "win32":
+        log.debug(
+            "gfile does not handle newlines correctly on windows so remote files are not"
+            "supported falling back to normal local file open."
+        )
+        return open(path, mode, newline=newline)
+    if not modern_gfile():
+        log.debug(
+            "tenosrboard.compat gfile does not work on older versions "
+            "of tensorboard for remote files, using normal local file open."
+        )
+        return open(path, mode, newline=newline)
+    try:
+        return gfile.GFile(path, mode)
+    except NotImplementedError as e:
+        # minimal dependencies are installed and only local files will work
+        return open(path, mode, newline=newline)
+
+
+def makedirs(path: pathlike):
+    if hasattr(gfile, "makedirs") and modern_gfile():
+        return gfile.makedirs(str(path))
+    # otherwise minimal dependencies are installed and only local files will work
+    return os.makedirs(path, exist_ok=True)

requirements/base.txt

@@ -7,3 +7,4 @@ future>=0.17.1  # required for builtins in setup.py
 # pyyaml>=3.13
 PyYAML>=5.1  # OmegaConf requirement >=5.1
 tqdm>=4.41.0
+packaging