Additional properties are not allowed ('execution_count', 'language', 'outputs' were unexpected) Failed validating 'additionalProperties' in markdown_cell: On instance['cells'][0]: {'cell_type': 'markdown', 'execution_count': 0, 'language': 'text', 'metadata': {'language': 'text'}, 'outputs': ['...0 outputs...'], 'source': '# Neural networks from scratch in Scala!\n\n\n'}
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