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QA.md

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+# ❓ Q&A for Building TensorRT Engines
+
+### 1. Error: `trtexec: not found`
+
+**Solution:** Try the following command
+
+```shell
+source trt/activate.sh
+```
+
+This command is used to configure the environment variables required to build the TensorRT Engine.
+
+### 2. Error: `Unable to open library: libnvinfer_plugin.so.9 due to libcublas.so.11: cannot open shared object file`
+
+This error occurs because the `libnvinfer_plugin.so.9` library depends on the `libcublas.so.11` library. 
+However, you may use a different version of cuda library (see `/usr/local/cuda`), such as cuda-12. It is recommended
+to use cuda-11 to build the TensorRT Engine.
+
+### 3. The size of the engine file generated by each build is different
+
+**Explanation:** During the process of building the engine, the building program will automatically select the 
+optimal kernel and other parameters. Therefore, the size of the engine file generated by each build may be different. 
+Therefore, please ensure that the GPU is idle during the build to ensure that the building program correctly selects 
+the optimal kernel.
+
+