Update segmentation_train.py

tweaking to allow support for png mask files

code/ML/segmentation_train.py

@@ -9,16 +9,19 @@
 from fastai.vision.all import *
 import numpy as np
 import pathlib
+import os
 
+#make a directory called models_out
+os.mkdir('models_out')
 
-root = pathlib.Path('~/data/ukv/train/')
-root = pathlib.Path('C:/Users/mm16jdc/Documents/GitHub/LeeWaveNet/data/ukv/train/')
+
+root = pathlib.Path('~/data/train/')
 
 codes={0:'no wave',255:'lee wave'}
 
 def label_func(fn): 
     string = str(fn.stem)[:49]+"mask.png"
-    return root/"mask_png"/string
+    return root/"masks_png"/string
 
 def open_xarray(fname):
     x = xr.open_dataarray(fname)
@@ -38,9 +41,9 @@ def open_xarray(fname):
                   splitter=RandomSplitter(),
                   batch_tfms=tfms,
                     )
-dsets = waves_ds.datasets(root/'700hPa')
+dsets = waves_ds.datasets(root/'vertical_velocities')
 
-dls = waves_ds.dataloaders(root/"700hPa", path=root, bs=4)
+dls = waves_ds.dataloaders(root/"vertical_velocities", path=root, bs=4)
 
 learn2 = unet_learner(dls,resnet34,metrics=DiceMulti)
 learn2.fine_tune(100,cbs=EarlyStoppingCallback(monitor='valid_loss', patience=5))