成功运行slim walkthrough notebook中的所有示例后，我想冻结图表。为了做到这一点，我运行了以下内容（从原始笔记本复制）：
import os
from datasets import flowers
from nets import inception
from preprocessing import inception_preprocessing
slim = tf.contrib.slim
image_size = inception.inception_v1.default_image_size
def get_init_fn():
"""Returns a function run by the chief worker to warm-start the training."""
checkpoint_exclude_scopes=["InceptionV1/Logits", "InceptionV1/AuxLogits"]
exclusions = [scope.strip() for scope in checkpoint_exclude_scopes]
variables_to_restore = []
for var in slim.get_model_variables():
excluded = False
for exclusion in exclusions:
if var.op.name.startswith(exclusion):
excluded = True
break
if not excluded:
variables_to_restore.append(var)
return slim.assign_from_checkpoint_fn(
os.path.join(checkpoints_dir, 'inception_v1.ckpt'),
variables_to_restore)
train_dir = '/tmp/inception_finetuned/'
with tf.Graph().as_default():
tf.logging.set_verbosity(tf.logging.INFO)
dataset = flowers.get_split('train', flowers_data_dir)
images, _, labels = load_batch(dataset, height=image_size, width=image_size)
# Create the model, use the default arg scope to configure the batch norm parameters.
with slim.arg_scope(inception.inception_v1_arg_scope()):
logits, _ = inception.inception_v1(images, num_classes=dataset.num_classes, is_training=True)
# Specify the loss function:
one_hot_labels = slim.one_hot_encoding(labels, dataset.num_classes)
slim.losses.softmax_cross_entropy(logits, one_hot_labels)
total_loss = slim.losses.get_total_loss()
# Create some summaries to visualize the training process:
tf.scalar_summary('losses/Total Loss', total_loss)
# Specify the optimizer and create the train op:
optimizer = tf.train.AdamOptimizer(learning_rate=0.01)
train_op = slim.learning.create_train_op(total_loss, optimizer)
# Run the training:
final_loss = slim.learning.train(
train_op,
logdir=train_dir,
init_fn=get_init_fn(),
number_of_steps=2)
print('Finished training. Last batch loss %f' % final_loss)
上面的代码在/ tmp / inception_finetuned文件夹中生成了以下文件：
然后，为了冻结图形，我运行了以下命令：
bazel-bin/tensorflow/python/tools/freeze_graph --input_graph=/tmp/inception_finetuned/graph.pbtxt --input_checkpoint=/tmp/inception_finetuned/model.ckpt-2 --output_graph=/tmp/freeze.pb --output_node_names=InceptionV1/Logits/Predictions/Softmax
但是，该命令产生了以下错误：
W tensorflow/core/framework/op_kernel.cc:968] Failed precondition: Attempting to use uninitialized value InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1
[[Node: _send_InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1_0 = _Send[T=DT_FLOAT, client_terminated=true, recv_device="/job:localhost/replica:0/task:0/cpu:0", send_device="/job:localhost/replica:0/task:0/cpu:0", send_device_incarnation=6007788667487390928, tensor_name="InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1:0", _device="/job:localhost/replica:0/task:0/cpu:0"](InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1)]]
...
W tensorflow/core/framework/op_kernel.cc:968] Failed precondition: Attempting to use uninitialized value InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1
[[Node: _send_InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1_0 = _Send[T=DT_FLOAT, client_terminated=true, recv_device="/job:localhost/replica:0/task:0/cpu:0", send_device="/job:localhost/replica:0/task:0/cpu:0", send_device_incarnation=6007788667487390928, tensor_name="InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1:0", _device="/job:localhost/replica:0/task:0/cpu:0"](InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1)]]
Traceback (most recent call last):
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/tools/freeze_graph.py", line 135, in <module>
tf.app.run()
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/platform/app.py", line 32, in run
sys.exit(main(sys.argv[:1] + flags_passthrough))
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/tools/freeze_graph.py", line 132, in main
FLAGS.output_graph, FLAGS.clear_devices, FLAGS.initializer_nodes)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/tools/freeze_graph.py", line 121, in freeze_graph
sess, input_graph_def, output_node_names.split(","))
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/framework/graph_util.py", line 226, in convert_variables_to_constants
returned_variables = sess.run(variable_names)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 717, in run
run_metadata_ptr)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 915, in _run
feed_dict_string, options, run_metadata)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 965, in _do_run
target_list, options, run_metadata)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 985, in _do_call
raise type(e)(node_def, op, message)
tensorflow.python.framework.errors.FailedPreconditionError: Attempting to use uninitialized value InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1
[[Node: _send_InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1_0 = _Send[T=DT_FLOAT, client_terminated=true, recv_device="/job:localhost/replica:0/task:0/cpu:0", send_device="/job:localhost/replica:0/task:0/cpu:0", send_device_incarnation=6007788667487390928, tensor_name="InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1:0", _device="/job:localhost/replica:0/task:0/cpu:0"](InceptionV1/Logits/Conv2d_0c_1x1/biases/Adam_1)]]
然后我尝试使用不同的优化器：
optimizer = tf.train.GradientDescentOptimizer(learning_rate=0.01)
并收到以下错误：
W tensorflow/core/framework/op_kernel.cc:968] Failed precondition: Attempting to use uninitialized value global_step
[[Node: _send_global_step_0 = _Send[T=DT_INT64, client_terminated=true, recv_device="/job:localhost/replica:0/task:0/cpu:0", send_device="/job:localhost/replica:0/task:0/cpu:0", send_device_incarnation=8900174487477528080, tensor_name="global_step:0", _device="/job:localhost/replica:0/task:0/cpu:0"](global_step)]]
...
[[Node: _send_global_step_0 = _Send[T=DT_INT64, client_terminated=true, recv_device="/job:localhost/replica:0/task:0/cpu:0", send_device="/job:localhost/replica:0/task:0/cpu:0", send_device_incarnation=8900174487477528080, tensor_name="global_step:0", _device="/job:localhost/replica:0/task:0/cpu:0"](global_step)]]
W tensorflow/core/framework/op_kernel.cc:968] Failed precondition: Attempting to use uninitialized value global_step
[[Node: _send_global_step_0 = _Send[T=DT_INT64, client_terminated=true, recv_device="/job:localhost/replica:0/task:0/cpu:0", send_device="/job:localhost/replica:0/task:0/cpu:0", send_device_incarnation=8900174487477528080, tensor_name="global_step:0", _device="/job:localhost/replica:0/task:0/cpu:0"](global_step)]]
Traceback (most recent call last):
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/tools/freeze_graph.py", line 135, in <module>
tf.app.run()
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/platform/app.py", line 32, in run
sys.exit(main(sys.argv[:1] + flags_passthrough))
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/tools/freeze_graph.py", line 132, in main
FLAGS.output_graph, FLAGS.clear_devices, FLAGS.initializer_nodes)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/tools/freeze_graph.py", line 121, in freeze_graph
sess, input_graph_def, output_node_names.split(","))
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/framework/graph_util.py", line 226, in convert_variables_to_constants
returned_variables = sess.run(variable_names)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 717, in run
run_metadata_ptr)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 915, in _run
feed_dict_string, options, run_metadata)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 965, in _do_run
target_list, options, run_metadata)
File "/Users/nikogamulin/workspace/tensorflow/bazel-bin/tensorflow/python/tools/freeze_graph.runfiles/org_tensorflow/tensorflow/python/client/session.py", line 985, in _do_call
raise type(e)(node_def, op, message)
tensorflow.python.framework.errors.FailedPreconditionError: Attempting to use uninitialized value global_step
[[Node: _send_global_step_0 = _Send[T=DT_INT64, client_terminated=true, recv_device="/job:localhost/replica:0/task:0/cpu:0", send_device="/job:localhost/replica:0/task:0/cpu:0", send_device_incarnation=8900174487477528080, tensor_name="global_step:0", _device="/job:localhost/replica:0/task:0/cpu:0"](global_step)]]
同样，如果我重新训练运行以下命令的模型：
python train_image_classifier.py \
--train_dir=${TRAIN_DIR} \
--dataset_dir=${DATASET_DIR} \
--dataset_name=flowers \
--dataset_split_name=train \
--model_name=inception_v1 \
--checkpoint_path=${CHECKPOINT_PATH} \
--checkpoint_exclude_scopes=InceptionV1/Logits,InceptionV1/AuxLogits/Logits \
--trainable_scopes=InceptionV1/Logits,InceptionV1/AuxLogits/Logits
并尝试冻结图表，获取与
相关的错误global_step
有谁知道为什么会出现上述错误以及如何解决这些错误？如果有人设法冻结初始v1（tf-slim）图表，我会感谢任何可能解决问题的建议。