forked from platypush/platypush
More flexible module loading and better lock management for models in Tensorflow plugin
This commit is contained in:
Fabio Manganiello
parent
9b23ab7015
commit
287b6303ae
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@ -1,8 +1,10 @@
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import json
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import os
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import pathlib
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import random
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import shutil
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import threading
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from contextlib import contextmanager
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from datetime import datetime
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from typing import List, Dict, Any, Union, Optional, Tuple, Iterable
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@ -57,36 +59,76 @@ class TensorflowPlugin(Plugin):
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def __init__(self, workdir: Optional[str] = None, **kwargs):
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"""
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:param workdir: Working directory for TensorFlow, where models will be stored
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:param workdir: Working directory for TensorFlow, where models will be stored and looked up by default
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(default: PLATYPUSH_WORKDIR/tensorflow).
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"""
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super().__init__(**kwargs)
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self.models: Dict[str, Model] = {}
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self._models_lock = threading.RLock()
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self._model_locks: Dict[str, threading.RLock()] = {}
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self._work_dir = os.path.abspath(os.path.expanduser(workdir)) if workdir else \
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os.path.join(Config.get('workdir'), 'tensorflow')
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self._models_dir = os.path.join(self._work_dir, 'models')
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os.makedirs(self._models_dir, mode=0o755, exist_ok=True)
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pathlib.Path(self._models_dir).mkdir(mode=0o755, exist_ok=True, parents=True)
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def _load_model(self, name: str, reload: bool = False) -> Model:
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if name in self.models and not reload:
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return self.models[name]
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@contextmanager
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def _lock_model(self, model_name: str):
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with self._models_lock:
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if model_name not in self._model_locks:
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self._model_locks[model_name] = threading.RLock()
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model_dir = os.path.join(self._models_dir, name)
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assert os.path.isdir(model_dir), 'The model {} does not exist'.format(name)
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model = load_model(model_dir)
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try:
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success = self._model_locks[model_name].acquire(blocking=True, timeout=30.)
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assert success, 'Unable to acquire the model lock'
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yield
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finally:
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# noinspection PyBroadException
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try:
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self._model_locks[model_name].release()
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except:
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pass
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def _load_model(self, model_name: str, reload: bool = False) -> Model:
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if model_name in self.models and not reload:
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return self.models[model_name]
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model = None
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model_dir = None
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if os.path.isdir(os.path.join(self._models_dir, model_name)):
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model_dir = os.path.join(self._models_dir, model_name)
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model = load_model(model_dir)
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else:
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model_name = os.path.abspath(os.path.expanduser(model_name))
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if model_name in self.models and not reload:
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return self.models[model_name]
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if os.path.isfile(model_name):
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model_dir = str(pathlib.Path(model_name).parent)
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model = load_model(model_name)
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elif os.path.isdir(model_name):
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model_dir = model_name
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model = load_model(model_dir)
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assert model, 'Could not find model: {}'.format(model_name)
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model.input_labels = []
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model.output_labels = []
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labels_file = os.path.join(model_dir, 'labels.json')
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if os.path.isfile(labels_file):
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with open(labels_file, 'r') as f:
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labels = json.load(f)
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if 'input' in labels:
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model.input_labels = labels['input']
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if 'output' in labels:
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model.output_labels = labels['output']
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if isinstance(labels, dict):
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if 'input' in labels:
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model.input_labels = labels['input']
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if 'output' in labels:
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model.output_labels = labels['output']
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elif hasattr(labels, '__iter__'):
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model.output_labels = labels
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with self._lock_model(model_name):
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self.models[model_name] = model
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return model
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@ -142,7 +184,8 @@ class TensorflowPlugin(Plugin):
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"""
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(Re)-load a model from the file system.
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:param model: Name of the model. Must be a folder name stored under ``<workdir>/models``.
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:param model: Name of the model. It can be a folder name stored under ``<workdir>/models``, or an absolute path
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to a model directory or file (Tensorflow directories, Protobuf models and HDF5 files are supported).
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:param reload: If ``True``, the model will be reloaded from the filesystem even if it's been already
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loaded, otherwise the model currently in memory will be kept (default: ``False``).
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:return: The model configuration.
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@ -157,8 +200,9 @@ class TensorflowPlugin(Plugin):
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:param model: Name of the model.
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"""
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assert model in self.models, 'The model {} is not loaded'.format(model)
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del self.models[model]
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with self._lock_model(model):
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assert model in self.models, 'The model {} is not loaded'.format(model)
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del self.models[model]
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@action
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def remove(self, model: str) -> None:
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@ -168,8 +212,9 @@ class TensorflowPlugin(Plugin):
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:param model: Name of the model.
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"""
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if model in self.models:
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del self.models[model]
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with self._lock_model(model):
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if model in self.models:
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del self.models[model]
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model_dir = os.path.join(self._models_dir, model)
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if os.path.isdir(model_dir):
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@ -388,7 +433,9 @@ class TensorflowPlugin(Plugin):
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model.input_labels = input_names or []
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model.output_labels = output_names or []
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self.models[name] = model
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with self._lock_model(name):
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self.models[name] = model
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return model.get_config()
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@action
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@ -520,7 +567,8 @@ class TensorflowPlugin(Plugin):
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**kwargs
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)
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self.models[name] = model
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with self._lock_model(name):
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self.models[name] = model
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return model.get_config()
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@staticmethod
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@ -551,10 +599,7 @@ class TensorflowPlugin(Plugin):
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model.name, size)
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colors = input_shape[3:]
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assert colors, ('The model {} requires a tensor with at least 3 inputs in order to process images: ' +
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'[WIDTH, HEIGHT, COLORS]').format(model.name)
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if colors[0] == 1:
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if len(colors) == 0 or colors[0] == 1:
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color_mode = 'grayscale'
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elif colors[0] == 3:
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color_mode = 'rgb'
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@ -664,7 +709,8 @@ class TensorflowPlugin(Plugin):
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"""
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Trains a model on a dataset for a fixed number of epochs.
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:param model: Name of the existing model to be trained.
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:param model: Name of the model. It can be a folder name stored under ``<workdir>/models``, or an absolute path
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to a model directory or file (Tensorflow directories, Protobuf models and HDF5 files are supported).
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:param inputs: Input data. It can be:
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- A numpy array (or array-like), or a list of arrays in case the model has multiple inputs.
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@ -818,7 +864,8 @@ class TensorflowPlugin(Plugin):
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"""
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Returns the loss value and metrics values for the model in test model.
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:param model: Name of the existing model to be trained.
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:param model: Name of the model. It can be a folder name stored under ``<workdir>/models``, or an absolute path
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to a model directory or file (Tensorflow directories, Protobuf models and HDF5 files are supported).
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:param inputs: Input data. It can be:
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- A numpy array (or array-like), or a list of arrays in case the model has multiple inputs.
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@ -922,7 +969,8 @@ class TensorflowPlugin(Plugin):
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"""
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Generates output predictions for the input samples.
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:param model: Name of the existing model to be trained.
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:param model: Name of the model. It can be a folder name stored under ``<workdir>/models``, or an absolute path
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to a model directory or file (Tensorflow directories, Protobuf models and HDF5 files are supported).
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:param inputs: Input data. It can be:
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- A numpy array (or array-like), or a list of arrays in case the model has multiple inputs.
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@ -1035,22 +1083,38 @@ class TensorflowPlugin(Plugin):
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:param overwrite: Overwrite the model files if they already exist.
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:param opts: Extra options to be passed to ``Model.save()``.
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"""
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assert model in self.models, 'No such model in memory: {}'.format(model)
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model_dir = os.path.join(self._models_dir, model)
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model = self.models[model]
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os.makedirs(model_dir, exist_ok=True)
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labels = {}
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labels_file = os.path.join(model_dir, 'labels.json')
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model_name = model
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model_dir = None
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if model.input_labels:
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labels['input'] = model.input_labels
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if model.output_labels:
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labels['output'] = model.output_labels
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if labels:
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with open(labels_file, 'w') as f:
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json.dump(labels, f)
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if os.path.isdir(os.path.join(self._work_dir, model_name)):
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model_dir = os.path.join(self._work_dir, model_name)
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else:
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model_name = os.path.abspath(os.path.expanduser(model_name))
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if os.path.isfile(model_name):
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model_dir = str(pathlib.Path(model_name).parent)
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elif os.path.isdir(model_name):
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model_dir = model_name
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model.save(model_dir, overwrite=overwrite, options=opts)
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assert model_dir and model_name in self.models, 'No such model loaded: {}'.format(model)
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with self._lock_model(model_name):
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model = self.models[model_name]
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labels = {}
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labels_file = os.path.join(model_dir, 'labels.json')
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if hasattr(model, 'input_labels') and model.input_labels:
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labels['input'] = model.input_labels
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if hasattr(model, 'output_labels') and model.output_labels:
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if hasattr(labels, 'input'):
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labels['output'] = model.output_labels
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else:
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labels = model.output_labels
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if labels:
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with open(labels_file, 'w') as f:
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json.dump(labels, f)
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model.save(model_name if os.path.isfile(model_name) else model_dir, overwrite=overwrite, options=opts)
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# vim:sw=4:ts=4:et:
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