Community Articles

VidyaSargur · ‎12-28-2017

Adding a Movidius NCS to a Raspberry Pi is a great way to augment your deep learning edge programming.

Hardware Setup

Raspberry Pi 3
Movidius NCS
PS 3 Eye Camera
128GB USB Stick

Software Setup

Standard NCS Setup
Python 3
sudo apt-get update
sudo apt-get install python-pip python-dev
sudo apt-get install python3-pip python3-dev
sudo apt-get install fswebcam
sudo apt-get install curl wget unzip
sudo apt-get install oracle-java8-jdk
sudo apt-get install sense-hat
sudo apt-get install octave -y
sudo apt install python3-gst-1.0
pip3 install psutil
Apache MiniFi https://www.apache.org/dyn/closer.lua?path=/nifi/minifi/0.3.0/minifi-0.3.0-bin.zip
git clone https://github.com/movidius/ncsdk.git
git clone https://github.com/movidius/ncappzoo.git

Run Example

~/workspace/ncappzoo/apps/image-classifier

Shell Script

/root/workspace/ncappzoo/apps/image-classifier/run.sh

 #!/bin/bash
DATE=$(date +"%Y-%m-%d_%H%M")
fswebcam -r 1280x720 --no-banner /opt/demo/images/$DATE.jpg
python3 -W ignore image-classifier2.py /opt/demo/images/$DATE.jpg

Forked Python Code

I added some extra variables I like to send from IoT devices (time, ip address, CPU temp) for flows and formatted as JSON.

#!/usr/bin/python3
# ****************************************************************************
# Copyright(c) 2017 Intel Corporation.
# License: MIT See LICENSE file in root directory.
# ****************************************************************************
# How to classify images using DNNs on Intel Neural Compute Stick (NCS)

import mvnc.mvncapi as mvnc
import skimage
from skimage import io, transform
import numpy
import os
import sys
import json
import time
import sys, socket
import subprocess
import datetime
from time import sleep
from time import gmtime, strftime


starttime= strftime("%Y-%m-%d %H:%M:%S",gmtime())


# User modifiable input parameters
NCAPPZOO_PATH           = os.path.expanduser( '~/workspace/ncappzoo' )
GRAPH_PATH              = NCAPPZOO_PATH + '/caffe/GoogLeNet/graph'
IMAGE_PATH              = sys.argv[1]
LABELS_FILE_PATH        = NCAPPZOO_PATH + '/data/ilsvrc12/synset_words.txt'
IMAGE_MEAN              = [ 104.00698793, 116.66876762, 122.67891434]
IMAGE_STDDEV            = 1
IMAGE_DIM               = ( 224, 224 )


# ---- Step 1: Open the enumerated device and get a handle to it -------------


# Look for enumerated NCS device(s); quit program if none found.
devices = mvnc.EnumerateDevices()
if len( devices ) == 0:
 print( 'No devices found' )
 quit()


# Get a handle to the first enumerated device and open it
device = mvnc.Device( devices[0] )
device.OpenDevice()


# ---- Step 2: Load a graph file onto the NCS device -------------------------


# Read the graph file into a buffer
with open( GRAPH_PATH, mode='rb' ) as f:
 blob = f.read()


# Load the graph buffer into the NCS
graph = device.AllocateGraph( blob )


# ---- Step 3: Offload image onto the NCS to run inference -------------------


# Read & resize image [Image size is defined during training]
img = print_img = skimage.io.imread( IMAGE_PATH )
img = skimage.transform.resize( img, IMAGE_DIM, preserve_range=True )


# Convert RGB to BGR [skimage reads image in RGB, but Caffe uses BGR]
img = img[:, :, ::-1]


# Mean subtraction & scaling [A common technique used to center the data]
img = img.astype( numpy.float32 )
img = ( img - IMAGE_MEAN ) * IMAGE_STDDEV


# Load the image as a half-precision floating point array
graph.LoadTensor( img.astype( numpy.float16 ), 'user object' )


# ---- Step 4: Read & print inference results from the NCS -------------------


# Get the results from NCS
output, userobj = graph.GetResult()


labels = numpy.loadtxt( LABELS_FILE_PATH, str, delimiter = '\t' )


order = output.argsort()[::-1][:6]


#### Initialization
external_IP_and_port = ('198.41.0.4', 53)  # a.root-servers.net
socket_family = socket.AF_INET


host = os.uname()[1]


def getCPUtemperature():
    res = os.popen('vcgencmd measure_temp').readline()
    return(res.replace("temp=","").replace("'C\n",""))


def IP_address():
        try:
            s = socket.socket(socket_family, socket.SOCK_DGRAM)
            s.connect(external_IP_and_port)
            answer = s.getsockname()
            s.close()
            return answer[0] if answer else None
        except socket.error:
            return None


cpuTemp=int(float(getCPUtemperature()))
ipaddress = IP_address()
# yyyy-mm-dd hh:mm:ss
currenttime= strftime("%Y-%m-%d %H:%M:%S",gmtime())
row =  { 'label1': labels[order[0]], 'label2': labels[order[1]], 'label3': labels[order[2]], 'label4': labels[order[3]], 'label5': labels[order[4]], 'currenttime': currenttime, 'host': host, 'cputemp': round(cpuTemp,2), 'ipaddress': ipaddress, 'starttime': starttime }
json_string = json.dumps(row)
print(json_string)

# ---- Step 5: Unload the graph and close the device -------------------------

graph.DeallocateGraph()
device.CloseDevice()

# ==== End of file ===========================================================

This same device also has a Sense-Hat, so we grab those as well.

Then I combined the two sets of code to produce a row of Sense-Hat sensor data and NCS AI results.

Source Code

https://github.com/tspannhw/rpi-minifi-movidius-sensehat/tree/master

Example Output JSON

{"label1": "b'n03794056 mousetrap'", "humidity": 17.2, "roll": 94.0, "yaw": 225.0, "label4": "b'n03127925 crate'", "cputemp2": 49.39, "label3": "b'n02091134 whippet'", "memory": 16.2, "z": -0.0, "diskfree": "15866.3 MB", "cputemp": 50, "pitch": 3.0, "temp": 34.9, "y": 1.0, "currenttime": "2017-12-28 19:09:32", "starttime": "2017-12-28 19:09:29", "tempf": 74.82, "label5": "b'n04265275 space heater'", "host": "sensehatmovidius", "ipaddress": "192.168.1.156", "pressure": 1032.7, "label2": "b'n02091032 Italian greyhound'", "x": -0.0}

The current version of Apache MiniFi is 0.30.

Make sure you download the 0.30 version of the Toolkit to convert your template created in your Apache NiFi screen to a proper config.yml. This is compatible with Apache NiFi 1.4.

MiNiFi (Java) Version 0.3.0 Release Date: 2017 December 22 (https://cwiki.apache.org/confluence/display/MINIFI/Release+Notes#ReleaseNotes-Version0.3.0)

To Build Your MiniFi YAML

buildconfig.sh YourConfigFileName.xml

minifi-toolkit-0.3.0/bin/config.sh transform $1 config.yml 
scp config.yml pi@192.168.1.156:/opt/dmeo/minifi-0.3.0/conf/

MiNiFi Config Version: 3
Flow Controller:
  name: Movidius MiniFi
  comment: ''
Core Properties:
  flow controller graceful shutdown period: 10 sec
  flow service write delay interval: 500 ms
  administrative yield duration: 30 sec
  bored yield duration: 10 millis
  max concurrent threads: 1
  variable registry properties: ''
FlowFile Repository:
  partitions: 256
  checkpoint interval: 2 mins
  always sync: false
  Swap:
    threshold: 20000
    in period: 5 sec
    in threads: 1
    out period: 5 sec
    out threads: 4
Content Repository:
  content claim max appendable size: 10 MB
  content claim max flow files: 100
  always sync: false
Provenance Repository:
  provenance rollover time: 1 min
  implementation: org.apache.nifi.provenance.MiNiFiPersistentProvenanceRepository
Component Status Repository:
  buffer size: 1440
  snapshot frequency: 1 min
Security Properties:
  keystore: ''
  keystore type: ''
  keystore password: ''
  key password: ''
  truststore: ''
  truststore type: ''
  truststore password: ''
  ssl protocol: ''
  Sensitive Props:
    key:
    algorithm: PBEWITHMD5AND256BITAES-CBC-OPENSSL
    provider: BC
Processors: []
Controller Services: []
Process Groups:
- id: 9fdb6f99-2e9f-3d86-0000-000000000000
  name: Movidius MiniFi
  Processors:
  - id: ceab4537-43cb-31c8-0000-000000000000
    name: Capture Photo and NCS Image Classifier
    class: org.apache.nifi.processors.standard.ExecuteProcess
    max concurrent tasks: 1
    scheduling strategy: TIMER_DRIVEN
    scheduling period: 60 sec
    penalization period: 30 sec
    yield period: 1 sec
    run duration nanos: 0
    auto-terminated relationships list: []
    Properties:
      Argument Delimiter: ' '
      Batch Duration:
      Command: /root/workspace/ncappzoo/apps/image-classifier/run.sh
      Command Arguments:
      Redirect Error Stream: 'false'
      Working Directory:
  - id: 9fbeac0f-1c3f-3535-0000-000000000000
    name: GetFile
    class: org.apache.nifi.processors.standard.GetFile
    max concurrent tasks: 1
    scheduling strategy: TIMER_DRIVEN
    scheduling period: 0 sec
    penalization period: 30 sec
    yield period: 1 sec
    run duration nanos: 0
    auto-terminated relationships list: []
    Properties:
      Batch Size: '10'
      File Filter: '[^\.].*'
      Ignore Hidden Files: 'false'
      Input Directory: /opt/demo/images/
      Keep Source File: 'false'
      Maximum File Age:
      Maximum File Size:
      Minimum File Age: 5 sec
      Minimum File Size: 10 B
      Path Filter:
      Polling Interval: 0 sec
      Recurse Subdirectories: 'true'
  Controller Services: []
  Process Groups: []
  Input Ports: []
  Output Ports: []
  Funnels: []
  Connections:
  - id: 1bd103a9-09dc-3121-0000-000000000000
    name: Capture Photo and NCS Image Classifier/success/0d6447ee-be36-3ec4-b896-1d57e374580f
    source id: ceab4537-43cb-31c8-0000-000000000000
    source relationship names:
    - success
    destination id: 0d6447ee-be36-3ec4-b896-1d57e374580f
    max work queue size: 10000
    max work queue data size: 1 GB
    flowfile expiration: 0 sec
    queue prioritizer class: ''
  - id: 3cdac0a3-aabf-3a15-0000-000000000000
    name: GetFile/success/0d6447ee-be36-3ec4-b896-1d57e374580f
    source id: 9fbeac0f-1c3f-3535-0000-000000000000
    source relationship names:
    - success
    destination id: 0d6447ee-be36-3ec4-b896-1d57e374580f
    max work queue size: 10000
    max work queue data size: 1 GB
    flowfile expiration: 0 sec
    queue prioritizer class: ''
  Remote Process Groups:
  - id: c8b85dc1-0dfb-3f01-0000-000000000000
    name: ''
    url: http://hostname.local:8080/nifi
    comment: ''
    timeout: 60 sec
    yield period: 10 sec
    transport protocol: HTTP
    proxy host: ''
    proxy port: ''
    proxy user: ''
    proxy password: ''
    local network interface: ''
    Input Ports:
    - id: befe3bd8-b4ac-326c-becf-fc448e4a8ff6
      name: MiniFi From TX1 Jetson
      comment: ''
      max concurrent tasks: 1
      use compression: false
    - id: 0d6447ee-be36-3ec4-b896-1d57e374580f
      name: Movidius Input
      comment: ''
      max concurrent tasks: 1
      use compression: false
    - id: e43fd055-eb0c-37b2-ad38-91aeea9380cd
      name: ChristmasTreeInput
      comment: ''
      max concurrent tasks: 1
      use compression: false
    - id: 4689a182-d7e1-3371-bef2-24e102ed9350
      name: From ADP Remote Partition 1
      comment: ''
      max concurrent tasks: 1
      use compression: false
    Output Ports: []
Input Ports: []
Output Ports: []
Funnels: []
Connections: []
Remote Process Groups: []
NiFi Properties Overrides: {}

Start Apache MiniFi on Your RPI Box

root@sensehatmovidius:/opt/demo/minifi-0.3.0/logs# ../bin/minifi.sh start1686],offset=0,name=2017-12-28_1452.jpg,size=531686], StandardFlowFileRecord[uuid=ca84bb5f-b9ff-40f2-b5f3-ece5278df9c2,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1514490624975-1, container=default, section=1], offset=1592409, length=531879],offset=0,name=2017-12-28_1453.jpg,size=531879], StandardFlowFileRecord[uuid=6201c682-967b-4922-89fb-d25abbc2fe82,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1514490624975-1, container=default, section=1], offset=2124819, length=527188],offset=0,name=2017-12-28_1455.jpg,size=527188]] (2.53 MB) to http://hostname.local:8080/nifi-api in 639 milliseconds at a rate of 3.96 MB/sec
2017-12-28 15:08:35,588 INFO [Timer-Driven Process Thread-8] o.a.nifi.remote.StandardRemoteGroupPort RemoteGroupPort[name=Movidius Input,targets=http://hostname.local:8080/nifi] Successfully sent [StandardFlowFileRecord[uuid=670a2494-5c60-4551-9a59-a1859e794cfe,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1514490883824-2, container=default, section=2], offset=530145, length=531289],offset=0,name=2017-12-28_1456.jpg,size=531289], StandardFlowFileRecord[uuid=39cad0fd-ccba-4386-840d-758b39daf48e,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1514491306665-2, container=default, section=2], offset=0, length=504600],offset=0,name=2017-12-28_1501.jpg,size=504600], StandardFlowFileRecord[uuid=3c2d4a2b-a10b-4a92-8c8b-ab73e6960670,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1514491298789-1, container=default, section=1], offset=0, length=527543],offset=0,name=2017-12-28_1502.jpg,size=527543], StandardFlowFileRecord[uuid=92cbfd2b-e94a-4854-b874-ef575dcf3905,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1514490883824-2, container=default, section=2], offset=0, length=529618],offset=0,name=2017-12-28_1454.jpg,size=529618]] (2 MB) to http://hostname.local:8080/nifi-api in 439 milliseconds at a rate of 4.54 MB/sec
2017-12-28 15:08:41,341 INFO [Timer-Driven Process Thread-2] o.a.nifi.remote.StandardRemoteGroupPort RemoteGroupPort[name=Movidius Input,targets=http://hostname.local:8080/nifi] Successfully sent [StandardFlowFileRecord[uuid=3fb7ca68-3e10-40c6-8f37-49532134689d,claim=StandardContentClaim [resourceClaim=StandardResourceClaim[id=1514491710195-1, container=default, section=1], offset=0, length=567],offset=0,name=21532511724407,size=567]] (567 bytes) to http://hostname.local:8080/nifi-api in 113 milliseconds at a rate of 4.88 KB/sec

Our Apache MiniFi flow sends that data via HTTP to our Apache NiFi server for processing and converting into a standard Apache ORC file in HDFS for Apache Hive queries.

Using InferAvroSchema we build a schema and upload it to the Hortonworks Schema Registry for processing.

Schema

{
 "type": "record",
 "name": "movidiussense",
 "fields": [
  {
   "name": "cputemp2",
   "type": "double",
   "doc": "Type inferred from '54.77'"
  },
  {
   "name": "pitch",
   "type": "double",
   "doc": "Type inferred from '4.0'"
  },
  {
   "name": "label5",
   "type": "string",
   "doc": "Type inferred from '\"b'n04238763 slide rule, slipstick'\"'"
  },
  {
   "name": "starttime",
   "type": "string",
   "doc": "Type inferred from '\"2017-12-28 20:08:37\"'"
  },
  {
   "name": "label2",
   "type": "string",
   "doc": "Type inferred from '\"b'n02871525 bookshop, bookstore, bookstall'\"'"
  },
  {
   "name": "y",
   "type": "double",
   "doc": "Type inferred from '1.0'"
  },
  {
   "name": "currenttime",
   "type": "string",
   "doc": "Type inferred from '\"2017-12-28 20:08:39\"'"
  },
  {
   "name": "x",
   "type": "double",
   "doc": "Type inferred from '-0.0'"
  },
  {
   "name": "label4",
   "type": "string",
   "doc": "Type inferred from '\"b'n03482405 hamper'\"'"
  },
  {
   "name": "roll",
   "type": "double",
   "doc": "Type inferred from '94.0'"
  },
  {
   "name": "temp",
   "type": "double",
   "doc": "Type inferred from '35.31'"
  },
  {
   "name": "host",
   "type": "string",
   "doc": "Type inferred from '\"sensehatmovidius\"'"
  },
  {
   "name": "diskfree",
   "type": "string",
   "doc": "Type inferred from '\"15817.0 MB\"'"
  },
  {
   "name": "memory",
   "type": "double",
   "doc": "Type inferred from '39.2'"
  },
  {
   "name": "label3",
   "type": "string",
   "doc": "Type inferred from '\"b'n02666196 abacus'\"'"
  },
  {
   "name": "label1",
   "type": "string",
   "doc": "Type inferred from '\"b'n02727426 apiary, bee house'\"'"
  },
  {
   "name": "yaw",
   "type": "double",
   "doc": "Type inferred from '225.0'"
  },
  {
   "name": "cputemp",
   "type": "int",
   "doc": "Type inferred from '55'"
  },
  {
   "name": "humidity",
   "type": "double",
   "doc": "Type inferred from '17.2'"
  },
  {
   "name": "tempf",
   "type": "double",
   "doc": "Type inferred from '75.56'"
  },
  {
   "name": "z",
   "type": "double",
   "doc": "Type inferred from '-0.0'"
  },
  {
   "name": "pressure",
   "type": "double",
   "doc": "Type inferred from '1033.2'"
  },
  {
   "name": "ipaddress",
   "type": "string",
   "doc": "Type inferred from '\"192.168.1.156\"'"
  }
 ]
}

Our data is now in HDFS with an Apache Hive table that Apache NiFi has generated the Create Table DDL for as follows:

CREATE EXTERNAL TABLE IF NOT EXISTS movidiussense (cputemp2 DOUBLE, pitch DOUBLE, label5 STRING, starttime STRING, label2 STRING, y DOUBLE, currenttime STRING, x DOUBLE, label4 STRING, roll DOUBLE, temp DOUBLE, host STRING, diskfree STRING, memory DOUBLE, label3 STRING, label1 STRING, yaw DOUBLE, cputemp INT, humidity DOUBLE, tempf DOUBLE, z DOUBLE, pressure DOUBLE, ipaddress STRING) STORED AS ORC LOCATION '/movidiussense'

Resources

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