[BUG Report]: An item with the same key has already been added. Key: keras_api

[astronomicalphenomena]

Description

When saving model, this error happened.
By reading Linq code, it seems like happening in TensorFlowNET.Keras.Engine.Layer.Serialize._trackable_children when concatenating model trackable with another trackable while they both have Key: keras_api

model trackable keys:
layer-0
layer-1
layer_with_weights-0
layer-2
keras_api

children keys:
non_trainable_variables
layers
variables
trainable_variables
keras_api

Reproduction Steps

load a keras pb model saved by python and save it immediately:

var model = keras.models.load_model(@"path");
model.summary();
model.save(@"path");

Known Workarounds

saveweght is fine

Configuration and Other Information

python tensorflow version: 2.10.0-GPU
TensorFlow.Redist version:2.10.0-CPU
Tensorflow.NET: 0.100.4
Tensorflow.Keras :0.10.4
.NET: 7.0

[AsakusaRinne]

Hi, thank you for reporting us this BUG. I'll fix it soon. :)

[astronomicalphenomena]

What's more, UWP will break down in clrcore while using V1 LoadSession function under new version, but not very sure, need more test. I will abandon UWP.

[GadgetNutt]

I have also experienced this error setting up a Conv1D layer:
Dim denseLayer5 = layers.Conv1D(64, kernel_size:=3, activation:="relu")
Dim denseOutput5 = denseLayer3.Apply(denseOutput4)

[AsakusaRinne]

Here is a possible work around #976 (comment). I'll fix this BUG this weekend. Recently a little busy and forgot it🤣Sorry for that

[AsakusaRinne]

#1049 partially fixed this problem. Note that tf.net support loading models with functions/concrete functions now but hasn't supported saving models with functions/concrete functions. The complete support for model saving would be added in 2 weeks. It's recommended to use model saving after loading (from model saved in python) after that.

[romanmanasipov]

Here is a possible work around #976 (comment). I'll fix this BUG this weekend. Recently a little busy and forgot it🤣Sorry for that

Can the mentioned workaround be added any time soon? The issue still persists when loading and saving keras model for the 2nd time, it throws:
System.ArgumentException: An item with the same key has already been added. Key: non_trainable_variables

can be reproduced e.g. using avaliable unit tests:

// build and save model
AlexnetFromSequential();
// load and save again
var model = tf.keras.models.load_model(@"./alexnet_from_sequential");

model.summary();


model.save("./saved_alexnet_from_sequential_after_loading"); // <- the ERROR