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helena_seed_4_nrows_2000_nclasses_10_ncols_100_stratify_True

helena_seed_4_nrows_2000_nclasses_10_ncols_100_stratify_True

active ARFF Publicly available Visibility: public Uploaded 17-11-2022 by Eddie Bergman
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Subsampling of the dataset helena (41169) with seed=4 args.nrows=2000 args.ncols=100 args.nclasses=10 args.no_stratify=True Generated with the following source code: ```python def subsample( self, seed: int, nrows_max: int = 2_000, ncols_max: int = 100, nclasses_max: int = 10, stratified: bool = True, ) -> Dataset: rng = np.random.default_rng(seed) x = self.x y = self.y # Uniformly sample classes = y.unique() if len(classes) > nclasses_max: vcs = y.value_counts() selected_classes = rng.choice( classes, size=nclasses_max, replace=False, p=vcs / sum(vcs), ) # Select the indices where one of these classes is present idxs = y.index[y.isin(classes)] x = x.iloc[idxs] y = y.iloc[idxs] # Uniformly sample columns if required if len(x.columns) > ncols_max: columns_idxs = rng.choice( list(range(len(x.columns))), size=ncols_max, replace=False ) sorted_column_idxs = sorted(columns_idxs) selected_columns = list(x.columns[sorted_column_idxs]) x = x[selected_columns] else: sorted_column_idxs = list(range(len(x.columns))) if len(x) > nrows_max: # Stratify accordingly target_name = y.name data = pd.concat((x, y), axis="columns") _, subset = train_test_split( data, test_size=nrows_max, stratify=data[target_name], shuffle=True, random_state=seed, ) x = subset.drop(target_name, axis="columns") y = subset[target_name] # We need to convert categorical columns to string for openml categorical_mask = [self.categorical_mask[i] for i in sorted_column_idxs] columns = list(x.columns) return Dataset( # Technically this is not the same but it's where it was derived from dataset=self.dataset, x=x, y=y, categorical_mask=categorical_mask, columns=columns, ) ```

28 features

class (target)nominal100 unique values
0 missing
V1numeric1958 unique values
0 missing
V2numeric553 unique values
0 missing
V3numeric616 unique values
0 missing
V4numeric1994 unique values
0 missing
V5numeric1999 unique values
0 missing
V6numeric1995 unique values
0 missing
V7numeric1997 unique values
0 missing
V8numeric1996 unique values
0 missing
V9numeric1990 unique values
0 missing
V10numeric1991 unique values
0 missing
V11numeric1992 unique values
0 missing
V12numeric1997 unique values
0 missing
V13numeric1997 unique values
0 missing
V14numeric1996 unique values
0 missing
V15numeric1996 unique values
0 missing
V16numeric2000 unique values
0 missing
V17numeric1999 unique values
0 missing
V18numeric1999 unique values
0 missing
V19numeric1997 unique values
0 missing
V20numeric2000 unique values
0 missing
V21numeric1999 unique values
0 missing
V22numeric1994 unique values
0 missing
V23numeric1999 unique values
0 missing
V24numeric1999 unique values
0 missing
V25numeric1998 unique values
0 missing
V26numeric1997 unique values
0 missing
V27numeric1997 unique values
0 missing

19 properties

2000
Number of instances (rows) of the dataset.
28
Number of attributes (columns) of the dataset.
100
Number of distinct values of the target attribute (if it is nominal).
0
Number of missing values in the dataset.
0
Number of instances with at least one value missing.
27
Number of numeric attributes.
1
Number of nominal attributes.
0.15
Percentage of instances belonging to the least frequent class.
3
Number of instances belonging to the least frequent class.
0
Number of binary attributes.
0
Percentage of binary attributes.
0
Percentage of instances having missing values.
0
Percentage of missing values.
0.02
Average class difference between consecutive instances.
96.43
Percentage of numeric attributes.
0.01
Number of attributes divided by the number of instances.
3.57
Percentage of nominal attributes.
6.15
Percentage of instances belonging to the most frequent class.
123
Number of instances belonging to the most frequent class.

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