change writing of obsolete ".h5" to ".keras" files

Author: jmitrevs

hls4ml/writer/catapult_writer.py

@@ -884,7 +884,7 @@ def write_yml(self, model):
         """
 
         def keras_model_representer(dumper, keras_model):
-            model_path = model.config.get_output_dir() + '/keras_model.h5'
+            model_path = model.config.get_output_dir() + '/keras_model.keras'
             keras_model.save(model_path)
             return dumper.represent_scalar('!keras_model', model_path)
 

hls4ml/writer/quartus_writer.py

@@ -1322,7 +1322,7 @@ def write_yml(self, model):
         """
 
         def keras_model_representer(dumper, keras_model):
-            model_path = model.config.get_output_dir() + '/keras_model.h5'
+            model_path = model.config.get_output_dir() + '/keras_model.keras'
             keras_model.save(model_path)
             return dumper.represent_scalar('!keras_model', model_path)
 

hls4ml/writer/vivado_writer.py

@@ -686,7 +686,7 @@ def write_yml(self, model):
         """
 
         def keras_model_representer(dumper, keras_model):
-            model_path = model.config.get_output_dir() + '/keras_model.h5'
+            model_path = model.config.get_output_dir() + '/keras_model.keras'
             keras_model.save(model_path)
             return dumper.represent_scalar('!keras_model', model_path)