Merge pull request #2910 from MycroftAI/feature/avx-check

Check for the AVX instruction set during install

dev_setup.sh

@@ -174,6 +174,32 @@ This script is designed to make working with Mycroft easy.  During this
 first run of dev_setup we will ask you a few questions to help setup
 your environment.'
     sleep 0.5
+    # The AVX instruction set is an x86 construct
+    # ARM has a range of equivalents, unsure which are (un)supported by TF.
+    if ! grep -q avx /proc/cpuinfo && [[ ! $(uname -m) == 'arm'* ]]; then
+      echo "
+The Precise Wake Word Engine requires the AVX instruction set, which is
+not supported on your CPU. Do you want to fall back to the PocketSphinx
+engine? Advanced users can build the precise engine with an older
+version of TensorFlow (v1.13) if desired and change use_precise to true
+in mycroft.conf.
+  Y)es, I want to use the PocketSphinx engine or my own.
+  N)o, stop the installation."
+      if get_YN ; then
+        if [[ ! -f /etc/mycroft/mycroft.conf ]]; then
+          $SUDO mkdir -p /etc/mycroft
+          $SUDO touch /etc/mycroft/mycroft.conf
+          $SUDO bash -c 'echo "{ \"use_precise\": true }" > /etc/mycroft/mycroft.conf'
+        else
+          $SUDO bash -c 'jq ". + { \"use_precise\": true }" /etc/mycroft/mycroft.conf > tmp.mycroft.conf' 
+          $SUDO mv -f tmp.mycroft.conf /etc/mycroft/mycroft.conf
+        fi
+      else
+        echo -e "$HIGHLIGHT N - quit the installation $RESET"
+        exit 1
+      fi
+      echo
+    fi
     echo "
 Do you want to run on 'master' or against a dev branch?  Unless you are
 a developer modifying mycroft-core itself, you should run on the

mycroft/client/speech/hotword_factory.py

@@ -47,6 +47,10 @@ class NoModelAvailable(Exception):
     pass
 
 
+class PreciseUnavailable(Exception):
+    pass
+
+
 def msec_to_sec(msecs):
     """Convert milliseconds to seconds.
 
@@ -190,6 +194,8 @@ class PreciseHotword(HotWordEngine):
             PreciseRunner, PreciseEngine, ReadWriteStream
         )
         local_conf = LocalConf(USER_CONFIG)
+        if not local_conf.get('precise', {}).get('use_precise', True):
+            raise PreciseUnavailable
         if (local_conf.get('precise', {}).get('dist_url') ==
                 'http://bootstrap.mycroft.ai/artifacts/static/daily/'):
             del local_conf['precise']['dist_url']
@@ -487,6 +493,10 @@ class HotWordFactory:
                     hotword, module
                 ))
                 instance = None
+            except PreciseUnavailable:
+                LOG.warning('Settings prevent Precise Engine use, '
+                            'falling back to default.')
+                instance = None
             except Exception:
                 LOG.exception(
                     'Could not create hotword. Falling back to default.')

mycroft/configuration/mycroft.conf

@@ -199,6 +199,7 @@
 
   // Settings used for any precise wake words
   "precise": {
+    "use_precise": true,
     "dist_url": "https://github.com/MycroftAI/precise-data/raw/dist/{arch}/latest",
     "model_url": "https://raw.githubusercontent.com/MycroftAI/precise-data/models/{wake_word}.tar.gz"
   },