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# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import threading
import time
import numpy as np
import tensorflow as tf
from google.protobuf import message
from werkzeug import wrappers
from tensorboard import util
from tensorboard.backend import http_util
from tensorboard.backend.event_processing import plugin_asset_util as pau
from tensorboard.plugins import base_plugin
from tensorboard.plugins.beholder import file_system_tools
from tensorboard.plugins.beholder import im_util
from tensorboard.plugins.beholder import shared_config
DEFAULT_INFO = [{
'name': 'Waiting for data...',
}]
class BeholderPlugin(base_plugin.TBPlugin):
"""
TensorBoard plugin for viewing model data as a live video during training.
"""
plugin_name = shared_config.PLUGIN_NAME
def __init__(self, context):
self._lock = threading.Lock()
self._MULTIPLEXER = context.multiplexer
self.PLUGIN_LOGDIR = pau.PluginDirectory(
context.logdir, shared_config.PLUGIN_NAME)
self.FPS = 10
self._config_file_lock = threading.Lock()
self.most_recent_frame = None
self.most_recent_info = DEFAULT_INFO
def get_plugin_apps(self):
return {
'/change-config': self._serve_change_config,
'/beholder-frame': self._serve_beholder_frame,
'/section-info': self._serve_section_info,
'/ping': self._serve_ping,
'/is-active': self._serve_is_active,
}
def is_active(self):
summary_filename = '{}/{}'.format(
self.PLUGIN_LOGDIR, shared_config.SUMMARY_FILENAME)
info_filename = '{}/{}'.format(
self.PLUGIN_LOGDIR, shared_config.SECTION_INFO_FILENAME)
return tf.gfile.Exists(summary_filename) and\
tf.gfile.Exists(info_filename)
def is_config_writable(self):
try:
if not tf.gfile.Exists(self.PLUGIN_LOGDIR):
tf.gfile.MakeDirs(self.PLUGIN_LOGDIR)
config_filename = '{}/{}'.format(
self.PLUGIN_LOGDIR, shared_config.CONFIG_FILENAME)
with self._config_file_lock:
file_system_tools.write_pickle(
file_system_tools.read_pickle(
config_filename, shared_config.DEFAULT_CONFIG),
config_filename)
return True
except tf.errors.PermissionDeniedError as e:
tf.logging.warning(
'Unable to write Beholder config, controls will be disabled: %s', e)
return False
@wrappers.Request.application
def _serve_is_active(self, request):
is_active = self.is_active()
# If the plugin isn't active, don't check if the configuration is writable
# since that will leave traces on disk; instead return True (the default).
is_config_writable = self.is_config_writable() if is_active else True
response = {
'is_active': is_active,
'is_config_writable': is_config_writable,
}
return http_util.Respond(request, response, 'application/json')
def _fetch_current_frame(self):
path = '{}/{}'.format(self.PLUGIN_LOGDIR, shared_config.SUMMARY_FILENAME)
with self._lock:
try:
frame = file_system_tools.read_tensor_summary(path).astype(np.uint8)
self.most_recent_frame = frame
return frame
except (message.DecodeError, IOError, tf.errors.NotFoundError):
if self.most_recent_frame is None:
self.most_recent_frame = im_util.get_image_relative_to_script(
'no-data.png')
return self.most_recent_frame
@wrappers.Request.application
def _serve_change_config(self, request):
config = {}
for key, value in request.form.items():
try:
config[key] = int(value)
except ValueError:
if value == 'false':
config[key] = False
elif value == 'true':
config[key] = True
else:
config[key] = value
self.FPS = config['FPS']
with self._config_file_lock:
file_system_tools.write_pickle(
config,
'{}/{}'.format(self.PLUGIN_LOGDIR, shared_config.CONFIG_FILENAME))
return http_util.Respond(request, {'config': config}, 'application/json')
@wrappers.Request.application
def _serve_section_info(self, request):
path = '{}/{}'.format(
self.PLUGIN_LOGDIR, shared_config.SECTION_INFO_FILENAME)
with self._lock:
default = self.most_recent_info
info = file_system_tools.read_pickle(path, default=default)
if info is not default:
with self._lock:
self.most_recent_info = info
return http_util.Respond(request, info, 'application/json')
def _frame_generator(self):
while True:
last_duration = 0
if self.FPS == 0:
continue
else:
time.sleep(max(0, 1/(self.FPS) - last_duration))
start_time = time.time()
array = self._fetch_current_frame()
image_bytes = util.encode_png(array)
frame_text = b'--frame\r\n'
content_type = b'Content-Type: image/png\r\n\r\n'
response_content = frame_text + content_type + image_bytes + b'\r\n\r\n'
last_duration = time.time() - start_time
yield response_content
@wrappers.Request.application
def _serve_beholder_frame(self, request): # pylint: disable=unused-argument
# Thanks to Miguel Grinberg for this technique:
# https://blog.miguelgrinberg.com/post/video-streaming-with-flask
mimetype = 'multipart/x-mixed-replace; boundary=frame'
return wrappers.Response(response=self._frame_generator(),
status=200,
mimetype=mimetype)
@wrappers.Request.application
def _serve_ping(self, request): # pylint: disable=unused-argument
return http_util.Respond(request, {'status': 'alive'}, 'application/json')
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