Pytorch->ONNX->TF-> SNPE Error for batchnorm variance

[Ashutosh1995]

I converted Mobilenet V1 SSD Pytorch model to ONNX format(https://github.com/qfgaohao/pytorch-ssd) and from there to protobuf format using ONNX TF (TF==1.15). ONNX version == 1.3 and SNPE == 1.36

Now when trying to convert protobuf file to DLC format for SNPE, I am getting the following error

ERROR - Conversion failed: Cannot resolve BatchNorm layer due to missing variance value.

Upon googling, I found this link https://developer.qualcomm.com/forum/qdn-forums/software/snapdragon-neural-processing-engine-sdk/35033 which says batchnorm variance should be either Const or Identity.

Since I am newbie in TF, could someone help resolve the issue

The command to convert pb file to DLC format is

snpe-tensorflow-to-dlc --input_network mb.pb --input_dim input.1 "1,3,300,300" --out_node 'boxes' --out_node 'scores' --output_path mb.dlc --allow_unconsumed_nodes

[jjfrog]

I had the same problem too when converting even a simple CNN from PyTorch -> ONNX ->TF ->SNPE . My CNN is just composed of Conv2D, BatchNormalization, Pooling and Activation function.
Then I tried another way to convert: PyTorch -> ONNX -> Caffe2 -> SNPE, and it worked fine.
But now I need to convert another model which is yolov5 to SNPE, and sadly some of its layers are not supported when converting ONNX -> Caffe2. Therefore, I go back to try TF -> SNPE again and still get this error.
Really need someone to solve this.

PyTorch 1.6.0
ONNX 1.7.0
Tensorflow 1.15.0
SNPE 1.40.0.2130

[WeihengXia0123]

Is there any update of this issue?

[chinhuang007]

A couple of updates:

1. TF 1.15 is no longer supported by onnx-tf
2. We need the code that leads to the error message and the onnx file to debug