Community
cancel
Showing results for 
Search instead for 
Did you mean: 
idata
Community Manager
370 Views

Having issues with loading a graph onto the NCS

I installed the ncsdk 1.12 version on a fresh RPi model 3 with Raspbian stretch.

 

I could run /ncappzoo/apps/hello_ncs_py with no issue.

 

When I am running the following script:

 

from mvnc import mvncapi as mvnc # grab a list of all NCS devices plugged in to USB print("[INFO] finding NCS devices...") devices = mvnc.EnumerateDevices() # if no devices found, exit the script if len(devices) == 0: print("[INFO] No devices found. Please plug in a NCS") quit() # use the first device since this is a simple test script print("[INFO] found {} devices. device0 will be used. " "opening device0...".format(len(devices))) device = mvnc.Device(devices[0]) device.OpenDevice() # open the CNN graph file print("[INFO] loading the graph file into RPi memory...") path = '/home/pi/ssd_on_pi/graph' with open(path, mode="rb") as f: graph_in_memory = f.read() # load the graph into the NCS print("[INFO] allocating the graph on the NCS...") graph = device.AllocateGraph(graph_in_memory)

 

I have this error:

 

[INFO] finding NCS devices... [INFO] found 1 devices. device0 will be used. opening device0... [INFO] loading the graph file into RPi memory... [INFO] allocating the graph on the NCS... Traceback (most recent call last): File "allocate_graph.py", line 25, in <module> graph = device.AllocateGraph(graph_in_memory) File "/usr/local/lib/python3.5/dist-packages/mvnc/mvncapi.py", line 203, in AllocateGraph raise Exception(Status(status)) Exception: mvncStatus.ERROR

 

So initially I installed the API-only mode, I received this error when I ran the above file. Then, I uninstalled API-only and tried the full SDK, still the same error :(

 

I think the problem is that somehow I am not able to allocate the graph onto the device. I generated the graph using a separate ubuntu vm, and I was able to successfully run the above code in the vm.

 

Any clue what could be wrong here?

0 Kudos
9 Replies
idata
Community Manager
102 Views

I just tried generating the graph from ncsdk/examples/caffe/GoogLeNet in the vm and copied it to the Pi. When running run.py in Pi, the same error shows up :(

 

pi@raspberrypi:~/workspace/ncsdk-1.12.00.01/examples/caffe/GoogLeNet $ python3 run.py Device 0 Address: 1.4.1 - VID/PID 03e7:2150 Starting wait for connect with 2000ms timeout Found Address: 1.4.1 - VID/PID 03e7:2150 Found EP 0x81 : max packet size is 64 bytes Found EP 0x01 : max packet size is 64 bytes Found and opened device Performing bulk write of 865724 bytes... Successfully sent 865724 bytes of data in 2788.732941 ms (0.296055 MB/s) Boot successful, device address 1.4.1 Found Address: 1.4.1 - VID/PID 03e7:f63b done Booted 1.4.1 -> VSC Traceback (most recent call last): File "run.py", line 66, in <module> graph = device.AllocateGraph(blob) File "/usr/local/lib/python3.5/dist-packages/mvnc/mvncapi.py", line 203, in AllocateGraph raise Exception(Status(status)) Exception: mvncStatus.ERROR
idata
Community Manager
102 Views

HALP…

idata
Community Manager
102 Views

@ama

 

     

  1. Does the NCSDK version on the VM side be v1.12?
  2.  

  3. Does the sample other than hello_ncs_py and GoogLeNet work?
  4.  

idata
Community Manager
102 Views

@PINTO

 

     

  1. Yes, the graph is generated using ncsdk v1.12 as well.
  2.  

  3. I have not tested other examples. I doubt other examples would work.
  4.  

idata
Community Manager
102 Views

@ama

 

Does "~/workspace/ncsdk-1.12.00.01/examples/caffe/GoogLeNet/cpp/run_cpp" work?

idata
Community Manager
102 Views

@ama Have you tried using a powered USB hub?

idata
Community Manager
102 Views

@Tome_at_Intel Yes I am indeed using a USB hub to connect the Movidius stick to the Pi. The only thing that is connected to the hub is the Pi. It is mainly because if I directly plug in the stick to the Pi, I will not have access to the other 3 USB ports :(, so essentially I am using the hub as a usb extension cable.

idata
Community Manager
102 Views

@Tome_at_Intel @PINTO Issue resolved. It is because that I am using a USB hub as an extension cable to connect the stick to the Pi. Everything works as expected when I am using an actual USB extension cable. I strongly suggest to have this added as a reminder in the RPi installation guidehttps://movidius.github.io/blog/ncs-apps-on-rpi/

idata
Community Manager
102 Views

@ama Glad you figured it out and narrowed it down to your USB hub.

 

The brand of the USB hub I've been using is a 7 port powered Anker USB hub and they seem to work well with the NCS so far. We do recommend using a powered USB hub whenever you can, although its not required. I have this listed in my Troubleshooting guide at https://ncsforum.movidius.com/discussion/370/intel-ncs-troubleshooting-help-and-guidelines?new=1.

Reply