saver=tf.train.Saver() to save the model that I trained, and I get three kinds of files named:
And a file called:
What is the connection with the .ckpt file?
I saw someone saved model with only .ckpt file, I don’t know how to make it.
How can I save model as a .pb file?
the .ckpt file is the old version output of
saver.save(sess), which is the equivalent of your
.ckpt-data (see below)
the “checkpoint” file is only here to tell some TF functions which is the latest checkpoint file.
.ckpt-meta contains the metagraph, i.e. the structure of your computation graph, without the values of the variables (basically what you can see in tensorboard/graph).
.ckpt-data contains the values for all the variables, without the structure. To restore a model in python, you’ll usually use the meta and data files with (but you can also use the
saver = tf.train.import_meta_graph(path_to_ckpt_meta) saver.restore(sess, path_to_ckpt_data)
I don’t know exactly for
.ckpt-index, I guess it’s some kind of index needed internally to map the two previous files correctly. Anyway it’s not really necessary usually, you can restore a model with only
.pb file can save your whole graph (meta + data). To load and use (but not train) a graph in c++ you’ll usually use it, created with
freeze_graph, which creates the
.pb file from the meta and data. Be careful, (at least in previous TF versions and for some people) the py function provided by
freeze_graph did not work properly, so you’d have to use the script version. Tensorflow also provides a
tf.train.Saver.to_proto() method, but I don’t know what it does exactly.
There are a lot of questions here about how to save and restore a graph. See the answer here for instance, but be careful that the two cited tutorials, though really helpful, are far from perfect, and a lot of people still seem to struggle to import a model in c++.
it looks like you can also use the .ckpt files in c++ now, so I guess you don’t necessarily need the .pb file any more.