[microTVM] Fix RVM onnx dependency and Zephyr document update (apache…

…#7774)

* fixing poetry

* fix onnx issue

* add zephyr README

* Update README.md

* clean up

* moved onnx

* replace with poetry

* add tflie

apps/microtvm/reference-vm/zephyr/README.md

@@ -0,0 +1,31 @@
+<!--- Licensed to the Apache Software Foundation (ASF) under one -->
+<!--- or more contributor license agreements.  See the NOTICE file -->
+<!--- distributed with this work for additional information -->
+<!--- regarding copyright ownership.  The ASF licenses this file -->
+<!--- to you under the Apache License, Version 2.0 (the -->
+<!--- "License"); you may not use this file except in compliance -->
+<!--- with the License.  You may obtain a copy of the License at -->
+
+<!---   http://www.apache.org/licenses/LICENSE-2.0 -->
+
+<!--- Unless required by applicable law or agreed to in writing, -->
+<!--- software distributed under the License is distributed on an -->
+<!--- "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY -->
+<!--- KIND, either express or implied.  See the License for the -->
+<!--- specific language governing permissions and limitations -->
+<!--- under the License. -->
+
+# microTVM Zephyr Reference Virtual Machine
+
+This directory contains setup files for Zephyr virtual machine used for testing microTVM platforms
+that are supported by [Zephyr Project](https://zephyrproject.org/).
+
+## VM Information for Developers
+Zephyr VM is published under [tlcpack/microtvm-zephyr](https://app.vagrantup.com/tlcpack/boxes/microtvm-zephyr).
+Here is a list of different release versions and their tools.
+
+### [v0.0.4](https://app.vagrantup.com/tlcpack/boxes/microtvm-zephyr/versions/0.0.4)
+
+- Zephyr [version 2.4.0]
+- Zephyr SDK [version 0.11.3]
+- nRFjProg [version 10.9.0]

apps/microtvm/reference-vm/zephyr/setup.sh

@@ -30,6 +30,10 @@ poetry env use 3.6
 # NOTE: due to https://github.com/python-poetry/poetry/issues/2247, download torch here.
 poetry run pip3 install torch==1.4.0 torchvision==0.5.0
 
+# importers
+poetry install -E importer-onnx
+poetry install -E importer-tflite
+
 echo "------------------------------[ TVM Message ]------------------------------"
 echo "WARNING: running 'poetry lock', which could take several minutes (depending"
 echo "on your network connection and the state of PyPI) as dependencies are"