diff --git a/extensions-builtin/PiD/nn/mmdit.py b/backend/nn/pixeldit/mmdit.py
similarity index 100%
rename from extensions-builtin/PiD/nn/mmdit.py
rename to backend/nn/pixeldit/mmdit.py
diff --git a/extensions-builtin/PiD/nn/model.py b/backend/nn/pixeldit/model.py
similarity index 100%
rename from extensions-builtin/PiD/nn/model.py
rename to backend/nn/pixeldit/model.py
diff --git a/extensions-builtin/PiD/nn/modules.py b/backend/nn/pixeldit/modules.py
similarity index 100%
rename from extensions-builtin/PiD/nn/modules.py
rename to backend/nn/pixeldit/modules.py
diff --git a/extensions-builtin/PiD/nn/pid.py b/backend/nn/pixeldit/pid.py
similarity index 100%
rename from extensions-builtin/PiD/nn/pid.py
rename to backend/nn/pixeldit/pid.py