René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"not JSON serializable error when running flow on a task","articleBody":"#### Description\r\nI encounter the following error when running a flow (for example 7103) on a task (for example 146607).\r\n`\u003copenml.flows.flow.OpenMLFlow object at 0x11cc43110\u003e is not JSON serializable`\r\n\r\n#### Steps/Code to Reproduce\r\n\r\nExample:\r\n```python\r\nimport openml\r\nflow = openml.flows.get_flow(7103)\r\ntask = openml.tasks.get_task(146607)\r\nrun = runs.run_flow_on_task(task, flow)\r\n```\r\n\r\n\r\n#### Expected Results\r\nOpenMLRun object\r\n\r\n#### Actual Results\r\n```\r\n---------------------------------------------------------------------------\r\nTypeError                                 Traceback (most recent call last)\r\n\u003cipython-input-102-f7fb112d9304\u003e in \u003cmodule\u003e()\r\n----\u003e 1 run = runs.run_flow_on_task(task, flow)\r\n\r\n/usr/local/lib/python2.7/site-packages/openml-0.7.0-py2.7.egg/openml/runs/functions.pyc in run_flow_on_task(task, flow, avoid_duplicate_runs, flow_tags, seed)\r\n     85     if avoid_duplicate_runs and flow_id:\r\n     86         flow_from_server = get_flow(flow_id)\r\n---\u003e 87         setup_id = setup_exists(flow_from_server, flow.model)\r\n     88         ids = _run_exists(task.task_id, setup_id)\r\n     89         if ids:\r\n\r\n/usr/local/lib/python2.7/site-packages/openml-0.7.0-py2.7.egg/openml/setups/functions.pyc in setup_exists(flow, model)\r\n     44             raise ValueError('This should not happen!')\r\n     45 \r\n---\u003e 46     openml_param_settings = openml.runs.OpenMLRun._parse_parameters(flow, model)\r\n     47     description = xmltodict.unparse(_to_dict(flow.flow_id,\r\n     48                                              openml_param_settings),\r\n\r\n/usr/local/lib/python2.7/site-packages/openml-0.7.0-py2.7.egg/openml/runs/run.pyc in _parse_parameters(flow, model)\r\n    360         flow_dict = get_flow_dict(flow)\r\n    361         parameters = extract_parameters(flow, flow_dict, model,\r\n--\u003e 362                                         True, flow.flow_id)\r\n    363 \r\n    364         return parameters\r\n\r\n/usr/local/lib/python2.7/site-packages/openml-0.7.0-py2.7.egg/openml/runs/run.pyc in extract_parameters(_flow, _flow_dict, component_model, _main_call, main_id)\r\n    340                                 raise e\r\n    341                             elif not isinstance(step, openml.flows.OpenMLFlow):\r\n--\u003e 342                                 raise e\r\n    343                         continue\r\n    344                     else:\r\n\r\nTypeError: \u003copenml.flows.flow.OpenMLFlow object at 0x11cc43110\u003e is not JSON serializable\r\n\r\n```\r\n\r\n#### Versions\r\nDarwin-17.5.0-x86_64-i386-64bit\r\n('Python', '2.7.15 (default, May 28 2018, 14:20:45) \\n[GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.1)]')\r\n('NumPy', '1.13.3')\r\n('SciPy', '1.0.0')\r\n('Scikit-Learn', '0.18.1')\r\n('OpenML', '0.7.0')\r\n\r\n\r\n\u003c!-- Thanks for contributing! --\u003e","author":{"url":"https://github.com/dbehrouz","@type":"Person","name":"dbehrouz"},"datePublished":"2018-06-05T09:10:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/477/openml-python/issues/477"}