Python Tensorflow GPU OOM错误

当在一组TF记录上运行CNN时，我得到一个OOM错误，Tensorflow似乎试图创建一个非常大的张量。我的模型稍微适合处理200x200大小的RGB图像。我使用来自Inception模型的脚本创建TFR记录，然后使用来自Inception模型的脚本丢失这些记录

我在Nvidia 960m上运行这个，有2GB的GPU内存和16GB的系统内存

我得到的错误是：

  ==== RESTART: C:\Users\User\stack\Projects\Neural Network\Nippler\cnn.py ====
INFO:tensorflow:Using default config.
INFO:tensorflow:Using config: {'_keep_checkpoint_max': 5, '_task_id': 0, '_session_config': None, '_master': '', '_tf_random_seed': None, '_environment': 'local', '_num_ps_replicas': 0, '_save_checkpoints_steps': None, '_keep_checkpoint_every_n_hours': 10000, '_save_checkpoints_secs': 600, '_evaluation_master': '', '_task_type': None, '_num_worker_replicas': 0, '_save_summary_steps': 100, '_model_dir': '/tmp/feature_model', '_is_chief': True, '_cluster_spec': <tensorflow.python.training.server_lib.ClusterSpec object at 0x0000013B77A3F9B0>, '_tf_config': gpu_options {
  per_process_gpu_memory_fraction: 1
}
}
INFO:tensorflow:Create CheckpointSaverHook.
Traceback (most recent call last):
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\client\session.py", line 1139, in _do_call
    return fn(*args)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\client\session.py", line 1121, in _run_fn
    status, run_metadata)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\contextlib.py", line 66, in __exit__
    next(self.gen)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\framework\errors_impl.py", line 466, in raise_exception_on_not_ok_status
    pywrap_tensorflow.TF_GetCode(status))
tensorflow.python.framework.errors_impl.ResourceExhaustedError: OOM when allocating tensor with shape[160000,1024]
     [[Node: dense/kernel/Assign = Assign[T=DT_FLOAT, _class=["loc:@dense/kernel"], use_locking=true, validate_shape=true, _device="/job:localhost/replica:0/task:0/gpu:0"](dense/kernel, dense/kernel/Initializer/random_uniform)]]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\User\stack\Projects\Neural Network\Nippler\cnn.py", line 82, in <module>
    tf.app.run()
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\platform\app.py", line 48, in run
    _sys.exit(main(_sys.argv[:1] + flags_passthrough))
  File "C:\Users\User\stack\Projects\Neural Network\Nippler\cnn.py", line 71, in main
    feature_classifier.fit(input_fn=lambda:image_processing.inputs(training_data, batch_size), steps=200000, monitors=[logging_hook])
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\util\deprecation.py", line 289, in new_func
    return func(*args, **kwargs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\contrib\learn\python\learn\estimators\estimator.py", line 455, in fit
    loss = self._train_model(input_fn=input_fn, hooks=hooks)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\contrib\learn\python\learn\estimators\estimator.py", line 1003, in _train_model
    config=self._session_config
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\monitored_session.py", line 352, in MonitoredTrainingSession
    stop_grace_period_secs=stop_grace_period_secs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\monitored_session.py", line 648, in __init__
    stop_grace_period_secs=stop_grace_period_secs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\monitored_session.py", line 477, in __init__
    self._sess = _RecoverableSession(self._coordinated_creator)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\monitored_session.py", line 822, in __init__
    _WrappedSession.__init__(self, self._create_session())
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\monitored_session.py", line 827, in _create_session
    return self._sess_creator.create_session()
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\monitored_session.py", line 538, in create_session
    self.tf_sess = self._session_creator.create_session()
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\monitored_session.py", line 412, in create_session
    init_fn=self._scaffold.init_fn)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\training\session_manager.py", line 279, in prepare_session
    sess.run(init_op, feed_dict=init_feed_dict)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\client\session.py", line 789, in run
    run_metadata_ptr)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\client\session.py", line 997, in _run
    feed_dict_string, options, run_metadata)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\client\session.py", line 1132, in _do_run
    target_list, options, run_metadata)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\client\session.py", line 1152, in _do_call
    raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.ResourceExhaustedError: OOM when allocating tensor with shape[160000,1024]
     [[Node: dense/kernel/Assign = Assign[T=DT_FLOAT, _class=["loc:@dense/kernel"], use_locking=true, validate_shape=true, _device="/job:localhost/replica:0/task:0/gpu:0"](dense/kernel, dense/kernel/Initializer/random_uniform)]]

Caused by op 'dense/kernel/Assign', defined at:
  File "<string>", line 1, in <module>
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\idlelib\run.py", line 130, in main
    ret = method(*args, **kwargs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\idlelib\run.py", line 357, in runcode
    exec(code, self.locals)
  File "C:\Users\User\stack\Projects\Neural Network\Nippler\cnn.py", line 82, in <module>
    tf.app.run()
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\platform\app.py", line 48, in run
    _sys.exit(main(_sys.argv[:1] + flags_passthrough))
  File "C:\Users\User\stack\Projects\Neural Network\Nippler\cnn.py", line 71, in main
    feature_classifier.fit(input_fn=lambda:image_processing.inputs(training_data, batch_size), steps=200000, monitors=[logging_hook])
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\util\deprecation.py", line 289, in new_func
    return func(*args, **kwargs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\contrib\learn\python\learn\estimators\estimator.py", line 455, in fit
    loss = self._train_model(input_fn=input_fn, hooks=hooks)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\contrib\learn\python\learn\estimators\estimator.py", line 955, in _train_model
    model_fn_ops = self._get_train_ops(features, labels)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\contrib\learn\python\learn\estimators\estimator.py", line 1162, in _get_train_ops
    return self._call_model_fn(features, labels, model_fn_lib.ModeKeys.TRAIN)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\contrib\learn\python\learn\estimators\estimator.py", line 1133, in _call_model_fn
    model_fn_results = self._model_fn(features, labels, **kwargs)
  File "C:\Users\User\stack\Projects\Neural Network\Nippler\cnn.py", line 30, in cnn_model_fn
    dense = tf.layers.dense(inputs=pool2_flat, units=1024, activation=tf.nn.relu)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\layers\core.py", line 215, in dense
    return layer.apply(inputs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\layers\base.py", line 492, in apply
    return self.__call__(inputs, *args, **kwargs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\layers\base.py", line 434, in __call__
    self.build(input_shapes[0])
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\layers\core.py", line 118, in build
    trainable=True)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\layers\base.py", line 374, in add_variable
    trainable=trainable and self.trainable)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\variable_scope.py", line 1065, in get_variable
    use_resource=use_resource, custom_getter=custom_getter)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\variable_scope.py", line 962, in get_variable
    use_resource=use_resource, custom_getter=custom_getter)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\variable_scope.py", line 367, in get_variable
    validate_shape=validate_shape, use_resource=use_resource)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\variable_scope.py", line 352, in _true_getter
    use_resource=use_resource)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\variable_scope.py", line 725, in _get_single_variable
    validate_shape=validate_shape)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\variables.py", line 200, in __init__
    expected_shape=expected_shape)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\variables.py", line 309, in _init_from_args
    validate_shape=validate_shape).op
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\state_ops.py", line 271, in assign
    validate_shape=validate_shape)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\ops\gen_state_ops.py", line 45, in assign
    use_locking=use_locking, name=name)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\framework\op_def_library.py", line 767, in apply_op
    op_def=op_def)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\framework\ops.py", line 2506, in create_op
    original_op=self._default_original_op, op_def=op_def)
  File "C:\Users\User\AppData\Local\Programs\Python\Python35\lib\site-packages\tensorflow\python\framework\ops.py", line 1269, in __init__
    self._traceback = _extract_stack()

ResourceExhaustedError (see above for traceback): OOM when allocating tensor with shape[160000,1024]
     [[Node: dense/kernel/Assign = Assign[T=DT_FLOAT, _class=["loc:@dense/kernel"], use_locking=true, validate_shape=true, _device="/job:localhost/replica:0/task:0/gpu:0"](dense/kernel, dense/kernel/Initializer/random_uniform)]]

---

我输入数据的方式是否错误？

据我所知，大张量来自

cnn\u model\u fn

中第一个完全连接的层

dense

。经过两次池化后，原始大小从200x200减少到50x50，有64个过滤器映射，因此

dense

的输入形状为[None，64，50，50]，并且必须具有形状[64*50*501024]，这正是错误消息报告的内容。这是参数的大小，与批次大小无关。尽量减少参数数量或使用具有更多ram的更好的GPU。

因此，如果我将输入图像转换为灰度图像，从而将通道从3减少到1，会有帮助吗？否。这只会影响第一个卷积层中的参数数量（权重形状从[5,5,3,32]到[5,5,1,32]），输出形状保持不变。为了彻底理解卷积，我建议从cs231n开始。图书馆文档本身也是一个很好的资源：并且可能与

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import numpy as np
import tensorflow as tf

from tensorflow.contrib import learn
from tensorflow.contrib.learn.python.learn.estimators import model_fn as model_fn_lib

import image_processing
import dataset

tf.logging.set_verbosity(tf.logging.INFO)

height = 200
width = 200
channels = 3

batch_size = 10

def cnn_model_fn(features, labels, mode):
    input_layer = tf.reshape(features, [-1, width, height, channels])

    conv1 = tf.layers.conv2d(inputs=input_layer, filters=32, kernel_size=[5, 5], padding="same", activation=tf.nn.relu)
    pool1 = tf.layers.max_pooling2d(inputs=conv1, pool_size=[2, 2], strides=2)
    conv2 = tf.layers.conv2d(inputs=pool1, filters=64, kernel_size=[5, 5], padding="same", activation=tf.nn.relu)
    pool2 = tf.layers.max_pooling2d(inputs=conv2, pool_size=[2, 2], strides=2)
    pool2_flat = tf.reshape(pool2, [-1, (int(width/4)) * (int(width/4)) * 64])
    dense = tf.layers.dense(inputs=pool2_flat, units=1024, activation=tf.nn.relu)
    dropout = tf.layers.dropout(inputs=dense, rate=0.4, training=mode == learn.ModeKeys.TRAIN)
    logits = tf.layers.dense(inputs=dropout, units=2)

    loss = None
    train_op = None

    if mode != learn.ModeKeys.INFER:
        onehot_labels = tf.one_hot(indices=tf.cast(labels, tf.int32), depth=2)
        loss = tf.losses.softmax_cross_entropy(onehot_labels=onehot_labels, logits=logits)

    if mode == learn.ModeKeys.TRAIN:
        train_op = tf.contrib.layers.optimize_loss(loss=loss, global_step=tf.contrib.framework.get_global_step(), learning_rate=0.001, optimizer="SGD")

    predictions = {
            "classes": tf.argmax(input=logits, axis=1),
            "probabilities": tf.nn.softmax(logits, name="softmax_tensor")
    }

    return model_fn_lib.ModelFnOps(mode=mode, predictions=predictions, loss=loss, train_op=train_op)

def main(unused_argv):
    training_data = dataset.Dataset("train-00000-of-00001", "train")
    validation_data = dataset.Dataset("validation-00000-of-00001", "validation")

    config = tf.ConfigProto()
    config.gpu_options.allow_growth = True

    sess = tf.InteractiveSession(config=config)


    feature_classifier = learn.Estimator(model_fn=cnn_model_fn, model_dir="/tmp/feature_model")
    tensors_to_log = {"probabilities": "softmax_tensor"}
    logging_hook = tf.train.LoggingTensorHook(tensors=tensors_to_log, every_n_iter=50)

    feature_classifier.fit(input_fn=lambda:image_processing.inputs(training_data, batch_size), steps=200000, monitors=[logging_hook])
    metrics = { "accuracy": learn.MetricSpec(metric_fn=tf.metrics.accuracy, prediction_key="classes"),
    }

if __name__ == "__main__":
    tf.app.run()