text: Title: Baseline model raise exception when using float32 value
  Body: At 'Explain' mode, for regression task.
  Other models complete training successfully.
  
  errors.md file content:
  
  `Error for 1_Baseline
  Object of type 'float32' is not JSON serializable Traceback (most recent call last): File "/home/moshe/.local/lib/python3.6/site-packages/supervised/base_automl.py", line 970, in _fit trained = self.train_model(params) File "/home/moshe/.local/lib/python3.6/site-packages/supervised/base_automl.py", line 312, in train_model mf.save(model_path) File "/home/moshe/.local/lib/python3.6/site-packages/supervised/model_framework.py", line 395, in save fout.write(json.dumps(desc, indent=4)) File "/usr/lib/python3.6/json/init.py", line 238, in dumps **kw).encode(obj) File "/usr/lib/python3.6/json/encoder.py", line 201, in encode chunks = list(chunks) File "/usr/lib/python3.6/json/encoder.py", line 430, in _iterencode yield from _iterencode_dict(o, _current_indent_level) File "/usr/lib/python3.6/json/encoder.py", line 404, in _iterencode_dict yield from chunks File "/usr/lib/python3.6/json/encoder.py", line 437, in _iterencode o = _default(o) File "/usr/lib/python3.6/json/encoder.py", line 180, in default o.class.name) TypeError: Object of type 'float32' is not JSON serializable`