# Buggy code
def hyperparameter_tune(
    self, X_train, y_train, X_val, y_val, scheduler_options, **kwargs
):
    time_start = time.time()
    """ Performs HPO and sets self.params to best hyperparameter values """
    self.verbosity = kwargs.get("verbosity", 2)
    logger.log(15, "Beginning hyperparameter tuning for Neural Network...")
    self._set_default_searchspace()  # changes non-specified default hyperparams from fixed values to search-spaces.
    if self.feature_types_metadata is None:
        raise ValueError("Trainer class must set feature_types_metadata for this model")
    scheduler_func = scheduler_options[0]
    scheduler_options = scheduler_options[1]
    if scheduler_func is None or scheduler_options is None:
        raise ValueError(
            "scheduler_func and scheduler_options cannot be None for hyperparameter tuning"
        )
    num_cpus = scheduler_options["resource"]["num_cpus"]
    # num_gpus = scheduler_options['resource']['num_gpus']  # TODO: Currently unused

    params_copy = self.params.copy()

    self.num_dataloading_workers = max(1, int(num_cpus / 2.0))
    self.batch_size = params_copy["batch_size"]
    train_dataset, val_dataset = self.generate_datasets(
        X_train=X_train, y_train=y_train, params=params_copy, X_val=X_val, y_val=y_val
    )
    train_path = self.path + "train"
    val_path = self.path + "validation"
    train_dataset.save(file_prefix=train_path)
    val_dataset.save(file_prefix=val_path)

    if not np.any(
        [isinstance(params_copy[hyperparam], Space) for hyperparam in params_copy]
    ):
        logger.warning(
            "Warning: Attempting to do hyperparameter optimization without any search space (all hyperparameters are already fixed values)"
        )
    else:
        logger.log(15, "Hyperparameter search space for Neural Network: ")
        for hyperparam in params_copy:
            if isinstance(params_copy[hyperparam], Space):
                logger.log(15, str(hyperparam) + ":   " + str(params_copy[hyperparam]))

    util_args = dict(
        train_path=train_path,
        val_path=val_path,
        model=self,
        time_start=time_start,
        time_limit=scheduler_options["time_out"],
    )
    tabular_nn_trial.register_args(util_args=util_args, **params_copy)
    scheduler = scheduler_func(tabular_nn_trial, **scheduler_options)
    if ("dist_ip_addrs" in scheduler_options) and (
        len(scheduler_options["dist_ip_addrs"]) > 0
    ):
        # TODO: Ensure proper working directory setup on remote machines
        # This is multi-machine setting, so need to copy dataset to workers:
        logger.log(15, "Uploading preprocessed data to remote workers...")
        scheduler.upload_files(
            [
                train_path + TabularNNDataset.DATAOBJ_SUFFIX,
                train_path + TabularNNDataset.DATAVALUES_SUFFIX,
                val_path + TabularNNDataset.DATAOBJ_SUFFIX,
                val_path + TabularNNDataset.DATAVALUES_SUFFIX,
            ]
        )  # TODO: currently does not work.
        logger.log(15, "uploaded")

    scheduler.run()
    scheduler.join_jobs()
    scheduler.get_training_curves(plot=False, use_legend=False)

    return self._get_hpo_results(
        scheduler=scheduler, scheduler_options=scheduler_options, time_start=time_start
    )


# Traceback (ValueError)
File delimiter for ../input/house-prices-advanced-regression-techniques/test.csv inferred as ',' (comma). If this is incorrect, please manually load the data as a pandas DataFrame.
Loaded data from: ../input/house-prices-advanced-regression-techniques/test.csv | Columns = 80 / 80 | Rows = 1459 -> 1459
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-48-91455d7b9940> in <module>
1 test_data = task.Dataset(file_path=os.path.join(in_dir, job, 'test.csv'))
2
----> 3 preds = model.predict(test_data)

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/autogluon/task/tabular_prediction/predictor.py in predict(self, dataset, model, as_pandas, use_pred_cache, add_to_pred_cache)
130         """
131         dataset = self.__get_dataset(dataset)
--> 132         return self._learner.predict(X=dataset, model=model, as_pandas=as_pandas, use_pred_cache=use_pred_cache, add_to_pred_cache=add_to_pred_cache)
133
134     def predict_proba(self, dataset, model=None, as_pandas=False, as_multiclass=False):

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/autogluon/utils/tabular/ml/learner/abstract_learner.py in predict(self, X, model, as_pandas, use_pred_cache, add_to_pred_cache)
127
128         if len(X_cache_miss) > 0:
--> 129             y_pred_proba = self.predict_proba(X=X_cache_miss, model=model, inverse_transform=False)
130             problem_type = self.trainer_problem_type or self.problem_type
131             y_pred = get_pred_from_proba(y_pred_proba=y_pred_proba, problem_type=problem_type)

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/autogluon/utils/tabular/ml/learner/abstract_learner.py in predict_proba(self, X, model, as_pandas, as_multiclass, inverse_transform)
92     # TODO: Add pred_proba_cache functionality as in predict()
93     def predict_proba(self, X: DataFrame, model=None, as_pandas=False, as_multiclass=False, inverse_transform=True):
---> 94         X = self.transform_features(X)
95         y_pred_proba = self.load_trainer().predict_proba(X, model=model)
96         if inverse_transform:

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/autogluon/utils/tabular/ml/learner/abstract_learner.py in transform_features(self, X)
216     def transform_features(self, X):
217         for feature_generator in self.feature_generators:
--> 218             X = feature_generator.transform(X)
219         return X
220

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/autogluon/utils/tabular/utils/decorators.py in inner1(*args, **kwargs)
12         begin = time.time()
13
---> 14         output = func(*args, **kwargs)
15
16         # storing time after function execution

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/autogluon/utils/tabular/features/abstract_feature_generator.py in transform(self, X)
183             raise ValueError(f'Required columns are missing from the provided dataset. Missing columns: {missing_cols}')
184
--> 185         X = X.astype(self.features_init_types)
186         X.reset_index(drop=True, inplace=True)
187         X_features = self.generate_features(X)

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/pandas/core/generic.py in astype(self, dtype, copy, errors, **kwargs)
5863                     results.append(
5864                         col.astype(
-> 5865                             dtype=dtype[col_name], copy=copy, errors=errors, **kwargs
5866                         )
5867                     )

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/pandas/core/generic.py in astype(self, dtype, copy, errors, **kwargs)
5880             # else, only a single dtype is given
5881             new_data = self._data.astype(
-> 5882                 dtype=dtype, copy=copy, errors=errors, **kwargs
5883             )
5884             return self._constructor(new_data).__finalize__(self)

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/pandas/core/internals/managers.py in astype(self, dtype, **kwargs)
579
580     def astype(self, dtype, **kwargs):
--> 581         return self.apply("astype", dtype=dtype, **kwargs)
582
583     def convert(self, **kwargs):

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/pandas/core/internals/managers.py in apply(self, f, axes, filter, do_integrity_check, consolidate, **kwargs)
436                     kwargs[k] = obj.reindex(b_items, axis=axis, copy=align_copy)
437
--> 438             applied = getattr(b, f)(**kwargs)
439             result_blocks = _extend_blocks(applied, result_blocks)
440

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/pandas/core/internals/blocks.py in astype(self, dtype, copy, errors, values, **kwargs)
557
558     def astype(self, dtype, copy=False, errors="raise", values=None, **kwargs):
--> 559         return self._astype(dtype, copy=copy, errors=errors, values=values, **kwargs)
560
561     def _astype(self, dtype, copy=False, errors="raise", values=None, **kwargs):

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/pandas/core/internals/blocks.py in _astype(self, dtype, copy, errors, values, **kwargs)
641                     # _astype_nansafe works fine with 1-d only
642                     vals1d = values.ravel()
--> 643                     values = astype_nansafe(vals1d, dtype, copy=True, **kwargs)
644
645                 # TODO(extension)

~/miniconda3/envs/autogluon/lib/python3.7/site-packages/pandas/core/dtypes/cast.py in astype_nansafe(arr, dtype, copy, skipna)
698         if not np.isfinite(arr).all():
699             raise ValueError(
--> 700                 "Cannot convert non-finite values (NA or inf) to " "integer"
701             )
702

ValueError: Cannot convert non-finite values (NA or inf) to integer

# Fixed code
def hyperparameter_tune(
    self, X_train, y_train, X_val, y_val, scheduler_options, **kwargs
):
    time_start = time.time()
    """ Performs HPO and sets self.params to best hyperparameter values """
    self.verbosity = kwargs.get("verbosity", 2)
    logger.log(15, "Beginning hyperparameter tuning for Neural Network...")
    self._set_default_searchspace()  # changes non-specified default hyperparams from fixed values to search-spaces.
    if self.feature_metadata is None:
        raise ValueError("Trainer class must set feature_metadata for this model")
    scheduler_func = scheduler_options[0]
    scheduler_options = scheduler_options[1]
    if scheduler_func is None or scheduler_options is None:
        raise ValueError(
            "scheduler_func and scheduler_options cannot be None for hyperparameter tuning"
        )
    num_cpus = scheduler_options["resource"]["num_cpus"]
    # num_gpus = scheduler_options['resource']['num_gpus']  # TODO: Currently unused

    params_copy = self.params.copy()

    self.num_dataloading_workers = max(1, int(num_cpus / 2.0))
    self.batch_size = params_copy["batch_size"]
    train_dataset, val_dataset = self.generate_datasets(
        X_train=X_train, y_train=y_train, params=params_copy, X_val=X_val, y_val=y_val
    )
    train_path = self.path + "train"
    val_path = self.path + "validation"
    train_dataset.save(file_prefix=train_path)
    val_dataset.save(file_prefix=val_path)

    if not np.any(
        [isinstance(params_copy[hyperparam], Space) for hyperparam in params_copy]
    ):
        logger.warning(
            "Warning: Attempting to do hyperparameter optimization without any search space (all hyperparameters are already fixed values)"
        )
    else:
        logger.log(15, "Hyperparameter search space for Neural Network: ")
        for hyperparam in params_copy:
            if isinstance(params_copy[hyperparam], Space):
                logger.log(15, str(hyperparam) + ":   " + str(params_copy[hyperparam]))

    util_args = dict(
        train_path=train_path,
        val_path=val_path,
        model=self,
        time_start=time_start,
        time_limit=scheduler_options["time_out"],
    )
    tabular_nn_trial.register_args(util_args=util_args, **params_copy)
    scheduler = scheduler_func(tabular_nn_trial, **scheduler_options)
    if ("dist_ip_addrs" in scheduler_options) and (
        len(scheduler_options["dist_ip_addrs"]) > 0
    ):
        # TODO: Ensure proper working directory setup on remote machines
        # This is multi-machine setting, so need to copy dataset to workers:
        logger.log(15, "Uploading preprocessed data to remote workers...")
        scheduler.upload_files(
            [
                train_path + TabularNNDataset.DATAOBJ_SUFFIX,
                train_path + TabularNNDataset.DATAVALUES_SUFFIX,
                val_path + TabularNNDataset.DATAOBJ_SUFFIX,
                val_path + TabularNNDataset.DATAVALUES_SUFFIX,
            ]
        )  # TODO: currently does not work.
        logger.log(15, "uploaded")

    scheduler.run()
    scheduler.join_jobs()
    scheduler.get_training_curves(plot=False, use_legend=False)

    return self._get_hpo_results(
        scheduler=scheduler, scheduler_options=scheduler_options, time_start=time_start
    )