Update README.md

README.md

@@ -24,4 +24,48 @@ language:
 - es
 - cs
 pipeline_tag: text-to-speech
----
+---
+## Guidelines for Converting Piper ONNX Model
+
+**References:**
+* https://github.com/nihui/ncnn-android-piper
+* https://github.com/OHF-Voice/piper1-gpl
+* https://huggingface.co/datasets/rhasspy/piper-checkpoints
+
+**Steps to convert Piper checkpoints to NCNN models:**
+
+1.  **Checkout the correct version of the piper repository:**
+    ```bash
+    git clone [https://github.com/OHF-Voice/piper1-gpl](https://github.com/OHF-Voice/piper1-gpl)
+    cd piper1-gpl
+    git checkout 113931937cf235fc8all1afd1ca4be209bc6919bc7
+    ```
+
+2.  **Apply the necessary patch:**
+    ```bash
+    # Ensure 'piper1-gpl.patch' is available
+    git apply piper1-gpl.patch
+    ```
+
+3.  **Set up the Python environment and install dependencies:**
+    ```bash
+    python3 -m venv .venv
+    source .venv/bin/activate
+    python3 -m pip install -e .[train]
+    ```
+
+4.  **Download a Piper checkpoint file (`.ckpt`) from Hugging Face:**
+    https://huggingface.co/datasets/rhasspy/piper-checkpoints
+
+5.  **Install the PNNX model converter:**
+    ```bash
+    pip install -U pnnx
+    ```
+
+6.  **Obtain the `export_ncnn.py` script.**
+
+7.  **Run the conversion script on your checkpoint file:**
+    ```bash
+    # Replace with your actual file
+    python export_ncnn.py (language code).ckpt (e.g., en.ckpt, fa.ckpt, ...)
+    ```