Move out mlrunner files into a different repo added as a submodule.

This is to be able to share the common code with MakeCode.

As PXT extensions cannot use submodules the mlrunner lib code
lives in the pxt extension and that repository is included here
as a sumodule.

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "micropython-microbit-v2"]
 	path = micropython-microbit-v2
 	url = https://github.com/microbit-foundation/micropython-microbit-v2.git
+[submodule "ml-module/pxt-ml-runner-poc"]
+	path = ml-module/pxt-ml-runner-poc
+	url = https://github.com/microbit-foundation/pxt-ml-runner-poc.git

README.md

@@ -1,4 +1,4 @@
-# ML4F MicroPython module
+# ML4F MicroPython module proof of concept
 
 An experiment to integrate ML4F into MicroPython.
 
@@ -7,34 +7,41 @@ An experiment to integrate ML4F into MicroPython.
 
 Clone this repository and initialise the git submodules (recursive submodule
 init will unnecessarily initialise all submodules from all MicroPython ports):
-```
+
+```bash
+git clone https://github.com/microbit-foundation/micropython-ml4f-poc.git
+cd micropython-ml4f-poc
 git submodule update --init
 git -C micropython-microbit-v2 submodule update --init
+git -C ml-module/pxt-ml-runner-poc submodule update --init
 ```
 
 Changes to the micro:bit MicroPython port are required for this experiment:
-```
+
+```bash
 git -C micropython-microbit-v2 apply ../micropython-microbit-v2.patch
 ```
 
 Build MicroPython's mpy-cross:
-```
+
+```bash
 make -C micropython-microbit-v2/lib/micropython/mpy-cross
 ```
 
 And build MicroPython with the ML module (and example model) included:
 
-```
+```bash
 make -C micropython-microbit-v2/src USER_C_MODULES=../../..
 ```
 
 Copy the hex file to the micro:bit:
-```
+```bash
 cp micropython-microbit-v2/src/build/MICROBIT.hex /Volumes/MICROBIT
 ```
 
 Transfer the example Python code into the board with
 [microFS](https://github.com/ntoll/microfs):
-```
+
+```bash
 ufs put ml-module/model-example/main.py
 ```

ml-module/main.py

@@ -3,12 +3,12 @@
 
 import ml
 
+print("Input size: {}".format(ml.get_input_length()))
+print("Model labels: {}".format(ml.get_labels()))
+
 TOTAL_SAMPLES = ml.get_input_length()
 acc_x_y_z = [0] * TOTAL_SAMPLES
 
-print("Model labels: {}".format(ml.get_labels()))
-print("Input size: {}".format(TOTAL_SAMPLES))
-
 i = 0
 while True:
     acc_x_y_z[i + 0] = accelerometer.get_x()
@@ -26,12 +26,4 @@
         else:
             print("t[{}] {}".format(time.ticks_ms() - t, result))
         i = 0
-    if button_a.is_pressed():
-        print("Use build-in model")
-        ml.internal_model(True)
-        sleep(500)
-    if button_b.is_pressed():
-        print("Use flash model")
-        ml.internal_model(False)
-        sleep(500)
     sleep(20)

ml-module/micropython.mk

@@ -1,12 +1,21 @@
 CPPEXAMPLE_MOD_DIR := $(USERMOD_DIR)
 
 SRC_USERMOD += \
-	$(CPPEXAMPLE_MOD_DIR)/ml-runner/model-example/model_example.c \
-	$(CPPEXAMPLE_MOD_DIR)/ml-runner/ml4f/ml4f.c \
+	$(CPPEXAMPLE_MOD_DIR)/pxt-ml-runner-poc/mlrunner/ml4f.c \
+	$(CPPEXAMPLE_MOD_DIR)/pxt-ml-runner-poc/mlrunner/mlrunner.c \
+	$(CPPEXAMPLE_MOD_DIR)/pxt-ml-runner-poc/mlrunner/mldataprocessor.c \
+	$(CPPEXAMPLE_MOD_DIR)/pxt-ml-runner-poc/mlrunner/example_dataprocessor.c \
+	$(CPPEXAMPLE_MOD_DIR)/src/mlinterface.c \
 	$(CPPEXAMPLE_MOD_DIR)/src/mlmodule.c
 
-SRC_USERMOD_CXX += $(CPPEXAMPLE_MOD_DIR)/ml-runner/mlrunner.cpp
+# SRC_USERMOD_CXX += $(CPPEXAMPLE_MOD_DIR)/ml-runner/mlrunner.cpp
 
-CFLAGS_USERMOD += -I$(CPPEXAMPLE_MOD_DIR)/ml-runner
+COMMON_FLAGS = \
+	-I$(CPPEXAMPLE_MOD_DIR)/src \
+	-I$(CPPEXAMPLE_MOD_DIR)/pxt-ml-runner-poc/mlrunner \
+	-DDEVICE_MLRUNNER_USE_EXAMPLE_MODEL=2 \
+	-DML_DEBUG_PRINT=1
 
-CXXFLAGS_USERMOD += -I$(CPPEXAMPLE_MOD_DIR)/ml-runner -std=c++11
+CFLAGS_USERMOD += $(COMMON_FLAGS)
+
+CXXFLAGS_USERMOD += $(COMMON_FLAGS) -std=c++11