fix init

Author: daisycx

README.md

@@ -85,6 +85,12 @@ python3 -m pip install git+https://github.com/MegEngine/mgeconvert.git@v0.4.2 --
 --install-option="--targets=tflite --tfversion=r2.4"
 ```
 
+`tflite`转换器依赖的 `libflatbuffers.so`位于 `$HOME/.local/lib`下，使用前需要执行：
+
+```bash
+export LD_LIBRARY_PATH=$HOME/.local/lib:$LD_LIBRARY_PATH
+```
+
 ### 源代码安装
 
 安装选项说明同上，以 caffe 为例，下面的命令将安装0.4.2版本的caffe转换器：
@@ -231,6 +237,17 @@ error removing /home/user/.local/lib/python3.6/site-packages/mgeconvert-0.5.0-py
 sudo pip3 uninstall mgeconvert
 ```
 
+2. 使用`tflite`转换器时`fbconverter.so`出现 `undefined symbol`错误：
+
+```
+ImportError: /home//lib/python3.6/site-packages/mgeconvert/backend/ir_to_tflite/pyflexbuffers/fbconverter.so: undefined symbol: _ZN11flatbuffers13ClassicLocale9instance_E
+```
+这是链接的`libflatbuffers.so`版本和依赖版本不一致导致的问题，执行以下命令使用`mgeconvert`编译的`libflatbuffers.so` ：
+
+```bash
+export LD_LIBRARY_PATH=$HOME/.local/lib:$LD_LIBRARY_PATH
+```
+
 ## 算子支持列表
 
 | tracemodule:rocket:<br/>mgo:fire:      | TFLite  | Caffe   | ONNX    |

mgeconvert/backend/ir_to_caffe/init.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -e
 
-python3 -m pip install --no-binary=protobuf protobuf>=3.11.1 --user
+python3 -m pip install --no-binary=protobuf "protobuf>=3.11.1" --user
 
 hash wget || (echo "please install wget package" && exit -1)
 hash protoc || (echo "please install protobuf-compiler package" && exit -1)

mgeconvert/backend/ir_to_onnx/init.sh

@@ -1,5 +1,5 @@
 #!/bin/bash -e
 
-python3 -m pip install onnx>=1.7.0 --user
+python3 -m pip install "onnx>=1.7.0" --user
 python3 -m pip install onnxoptimizer --user
 python3 -m pip install protobuf --user

mgeconvert/backend/ir_to_tflite/init.sh

@@ -17,13 +17,12 @@ fi
 
 TMP_DIR="/tmp/mgeconvert/flatbuffers"
 
-if [[ "$FLATC_VERSION" != "flatc version 1.12.0" || "$FLAT_BUFFER_VERSION" != "Version: 1.12" ]]; then
+if [[ ! -L "$HOME/.local/lib/libflatbuffers.so" || "$FLATC_VERSION" != "flatc version 1.12.0" || "$FLAT_BUFFER_VERSION" != "Version: 1.12" ]]; then
     rm -rf $TMP_DIR
     git clone https://github.com/google/flatbuffers.git -b v1.12.0 $TMP_DIR
 fi
 
-if [[ "$FLATC_VERSION" != "flatc version 1.12.0" ]]; then
-    python3 -m pip uninstall flatbuffers -y
+if [[ ! -L "$HOME/.local/lib/libflatbuffers.so" || "$FLATC_VERSION" != "flatc version 1.12.0" ]]; then
     rm -rf $HOME/.local/bin/flatc
     rm -rf $HOME/.local/lib/libflatbuffers*
     # build flatbuffers
@@ -69,4 +68,4 @@ PYTHON_STDLIB=$(python3 -c "import sysconfig; print(sysconfig.get_paths()['stdli
 
 g++ fbconverter.cc --std=c++14 -fPIC --shared -I$HOME/.local/include -I${PYBIND11_HEADER} -I${PYTHON_INCLUDE} -L${PYTHON_STDLIB} -L$HOME/.local/lib  -lflatbuffers -o fbconverter.so
 
-rm -r /tmp/mgeconvert
+rm -rf /tmp/mgeconvert