Remove large Keras checkpoint files

checkpoints/checkpoint_epoch_10.keras

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checkpoints/checkpoint_epoch_20.keras

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-size 49516918

checkpoints/checkpoint_epoch_30.keras

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-version https://git-lfs.github.com/spec/v1
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-size 49516918

checkpoints/checkpoint_epoch_40.keras

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-version https://git-lfs.github.com/spec/v1
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-size 49516918

checkpoints/metrics_epoch_10.json

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-{
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checkpoints/metrics_epoch_20.json

@@ -1,9 +0,0 @@
-{
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checkpoints/metrics_epoch_30.json

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-{
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checkpoints/metrics_epoch_40.json

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-{
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final_model.keras

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-size 49516918

model_results.json

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-{
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-    "Tetralogy of Fallot",
-    "Pulmonary Valve Stenosis",
-    "Patent Ductus Arteriosus",
-    "Pulmonary Artery Stenosis",
-    "Pulmonary Valve Regurgitation",
-    "Mitral Valve Insufficiency",
-    "Congenital Heart Malformation",
-    "Healthy"
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-    "I42.2": "Hypertrophic Cardiomyopathy",
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