| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| Code snippets used to generate to generate the binary images from Java. |
| Heavy items have negative weights to allow a simple predicate to filter |
| heavy vs light sketch entires. |
| |
| |
| varopt_sketch_long_sampling.bin: |
| final VarOptItemsSketch<String> sk = VarOptItemsSketch.newInstance(1024); |
| for (int i = 1; i <= 200; ++i) { |
| sk.update(Integer.toString(i), 1000.0 / i); |
| } |
| byte[] bytes = sk.toByteArray(new ArrayOfStringsSerDe()); |
| |
| |
| varopt_sketch_string_exact.bin: |
| final VarOptItemsSketch<Long> sk = VarOptItemsSketch.newInstance(1024); |
| for (long i = 0; i < 2000; ++i) { |
| sk.update(i, 1.0); |
| } |
| sk.update(-1L, 100000.0); |
| sk.update(-2L, 110000.0); |
| sk.update(-3L, 120000.0); |
| byte[] bytes = sk.toByteArray(new ArrayOfLongsSerDe()); |
| |
| |
| varopt_union_double_sampling.bin: |
| // parallels small samplign sketch test |
| final int kSmall = 16; |
| final int n1 = 32; |
| final int n2 = 64; |
| final int kMax = 128; |
| |
| // small k sketch, but sampling |
| VarOptItemsSketch<Double> sketch = VarOptItemsSketch.newInstance(kSmall); |
| for (int i = 0; i < n1; ++i) { |
| sketch.update(1.0 * i, 1.0); |
| } |
| sketch.update(-1.0, n1 * n1); // add a heavy item |
| |
| final VarOptItemsUnion<Double> union = VarOptItemsUnion.newInstance(kMax); |
| union.update(sketch); |
| |
| // another one, but different n to get a different per-item weight |
| sketch = VarOptItemsSketch.newInstance(kSmall); |
| for (int i = 0; i < n2; ++i) { |
| sketch.update(1.0 * i, 1.0); |
| } |
| union.update(sketch); |
| byte[] bytes = union.toByteArray(new ArrayOfDoublesSerDe()); |