doc: update README.md

README.md

@@ -1,5 +1,5 @@
 ---
-title: SamGIS - LISA on CUDA
+title: SamGIS - LISA on ZeroGPU
 emoji: 🗺️
 colorFrom: red
 colorTo: blue
@@ -14,8 +14,34 @@ license: mit
 
 [LISA](https://github.com/dvlab-research/LISA) (Reasoning Segmentation via Large Language Model) applied to geospatial data thanks to [SamGIS](https://github.com/trincadev/samgis-be).
 
-About SamGIS - LISA on ZeroGPU see the [samgis-lisa-on-zero demo](https://huggingface.co/spaces/aletrn/samgis-lisa-on-zero).
+I also adapted LISA to HuggingFace [lisa-on-cuda](https://huggingface.co/spaces/aletrn/lisa-on-cuda) ZeroGPU space.
+
+##  Custom environment variables for HuggingFace ZeroGPU Space
+
+Fundamental environment variables you need are:
+
+```bash
+XDG_CACHE_HOME="/data/.cache"
+PROJECT_ROOT_FOLDER="/home/user/app"
+WORKDIR="/home/user/app"
+```
+
+Derived ones:
+
+```bash
+MPLCONFIGDIR="/data/.cache/matplotlib"
+TRANSFORMERS_CACHE="/data/.cache/transformers"
+PYTORCH_KERNEL_CACHE_PATH="/data/.cache/torch/kernels"
+FASTAPI_STATIC="/home/user/app/static"
+VIS_OUTPUT="/home/user/app/vis_output"
+MODEL_FOLDER="/home/user/app/machine_learning_models"
+FOLDERS_MAP='{"WORKDIR":"/home/user/app","XDG_CACHE_HOME":"/data/.cache","PROJECT_ROOT_FOLDER":"/home/user/app","MPLCONFIGDIR":"/data/.cache/matplotlib","TRANSFORMERS_CACHE":"/data/.cache/transformers","PYTORCH_KERNEL_CACHE_PATH":"/data/.cache/torch/kernels","FASTAPI_STATIC":"/home/user/app/static","VIS_OUTPUT":"/home/user/app/vis_output"}'
+```
+
+The function `build_frontend()` from lisa_on_cuda package create all the folders required for this project using the environment variable `FOLDERS_MAP`. That's useful for cache folders (XDG_CACHE_HOME, MPLCONFIGDIR, TRANSFORMERS_CACHE, PYTORCH_KERNEL_CACHE_PATH) because missing these can slow down the inference process. Also you could keep these folders in a permanent storage disk mounted on a custom path.
 
 To change the base relative url for custom frontend add the VITE_PREFIX environment variable, e.g.:
 
+```bash
 VITE_PREFIX="/custom-url"
+```