Intel® Distribution of OpenVINO™ Toolkit
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Python-demo Error : ModuleNotFoundError: No module named 'models' .etc


Demo : open_model_zoo/demos/human_pose_estimation_demo/python/
Openvino version : l_openvino_toolkit_runtime_raspbian_p_2021.2.185
Device : RaspberryPi+Intel NCS2

In the demo, it need import many modules like:
import models
import monitors
from images_capture import open_images_capture
from pipelines import get_user_config, AsyncPipeline
from performance_metrics import PerformanceMetrics
from helpers import resolution

Because there is no human_pose_estimation_demo of python in this openvino install package, I download it in open_model_zoo.
But when I run it in my RaspberryPi, there many errors like: No module named 'models', 'monitors', 'images_capture'.etc. And I can not find these module's file in openvino install package.

I don't know why and which version of openvino install package can be used for the python's demo of human_pose_estimate. Thanks.

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4 Replies

Hi Liu Lei,


Thanks for reaching out to us.


For your information, the package does not include the Open Model Zoo demo applications.

All the required modules are located in the common folders.


You can download them from the Open Models Zoo repository with this command line:

git clone -b 2021.2 


However, you are still unable to run the Human Pose Estimation Python Demo due to nGraph module is not included in the OpenVINO™ Toolkit for Raspbian OS Package. You have to build Open Source OpenVINO™ Toolkit for Raspbian OS in order to import the nGraph module.


You can refer to Building Open Source OpenVINO™ toolkit for Raspbian* OS and Intel® Neural Compute Stick 2 for the instructions.


Some changes that need to make are:

>Installing OpenCV from source

git clone --depth 1 --branch 4.5.3-openvino


>Downloading source code and installing dependencies

git clone --depth 1



pip3 install -r requirements.txt


On a separate note, I would recommend you choose Human Pose Estimation C++ Demo which allows you to proceed with your current installed package.


The steps for building Human Pose Estimation C++ Demo are given below:

1. source /opt/intel/openvino_2021/bin/

2. mkdir build && cd build

3. cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-march=armv7-a" /<download_dir>/open_model_zoo/demos

4. make -j2 human_pose_estimation_demo

The demo is located in the /build/armv7l/Release directory.







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Thank you for your reply.

I found that there is a folder named ngraph in the deployment_tools directory in version of l_openvino_toolkit_runtime_raspbian_p_2021.2.185. Does it mean that ngraph modules can be used in this version?

But when I was running the human_pose_estimation demo, it still prompted that ngraph could not be imported. I don't know why.

If I don't build Open Source OpenVINO™ Toolkit for Raspbian OS now, will this be improved in the later version of l_openvino_toolkit_runtime_raspbian_p so that I can download and use it directly.

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Hi Liu Lei,


The nGraph module does not bind for the Python in Raspbian package.


There is no ngraph folder in the Python3.7 folder of the package: <installed_dir>/l_openvino_toolkit_runtime_raspbian_p_2021.2.185/python/python3.7


The development team will review the possibility to add this in future OpenVINO releases.


Meantime, you can comment out import ngraph for those models that are not using ngraph.


For instance, Human Pose Estimation Python Demo supports Intel pre-trained Human Pose Estimation Models (human-pose-estimation-0001,0002,0003 and 0004) in two types of architecture (“ae” - Associative Embedding or “openpose" for OpenPose).


Looking into these two architectures, OpenPose includes the nGraph module while Associative Embedding does not include the nGraph module. Hence, you can proceed to run Human Pose Estimation Python Demo by editing the source code of the demo and only use “ae” for the architecture.


Changes need to make:

1)     open_model_zoo/demos/python_demos/human_pose_estimation_demo/

         Line 30: from human_pose_estimation_demo.model import HPEAssociativeEmbedding


2)     open_model_zoo/demos/python_demos/human_pose_estimation_demo/human_pose_estimation_demo/

         Line 23: #import ngraph as ng



Models that supported by Associative Embedding architecture:

i)    human-pose-estimation-0002

ii)   human-pose-estimation-0003

iii)  human-pose-estimation-0004







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Hi Liu Lei,

This thread will no longer be monitored since we have provided a solution. If you need any additional information from Intel, please submit a new question. 



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