org.apache.ignite.ml.dataset.impl.cache

## Class CacheBasedDataset<K,V,C extends Serializable,D extends AutoCloseable>

- java.lang.Object
- - org.apache.ignite.ml.dataset.impl.cache.CacheBasedDataset<K,V,C,D>

- Type Parameters:
    `K` - Type of a key in `upstream` data.
    `V` - Type of a value in `upstream` data.
    `C` - Type of a partition `context`.
    `D` - Type of a partition `data`.
  All Implemented Interfaces:
    AutoCloseable, Dataset<C,D>

      public class CacheBasedDataset<K,V,C extends Serializable,D extends AutoCloseable>
      extends Object
      implements Dataset<C,D>

  An implementation of dataset based on Ignite Cache, which is used as `upstream` and as reliable storage for partition `context` as well.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `CacheBasedDataset(Ignite ignite, IgniteCache<K,V> upstreamCache, IgniteBiPredicate<K,V> filter, UpstreamTransformerBuilder upstreamTransformerBuilder, IgniteCache<Integer,C> datasetCache, LearningEnvironmentBuilder envBuilder, PartitionDataBuilder<K,V,C,D> partDataBuilder, UUID datasetId, boolean upstreamKeepBinary, LearningEnvironment localLearningEnv, int retriesCnt)` Constructs a new instance of dataset based on Ignite Cache, which is used as `upstream` and as reliable storage for partition `context` as well.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()`
    `<R> R` | `compute(IgniteBiFunction<D,LearningEnvironment,R> map, IgniteBinaryOperator<R> reduce, R identity)` Applies the specified `map` function to every partition `data` and `LearningEnvironment` in the dataset and then reduces `map` results to final result by using the `reduce` function.
    `<R> R` | `computeWithCtx(IgniteTriFunction<C,D,LearningEnvironment,R> map, IgniteBinaryOperator<R> reduce, R identity)` Applies the specified `map` function to every partition `data`, `context` and partition index in the dataset and then reduces `map` results to final result by using the `reduce` function.
    `IgniteCache<Integer,C>` | `getDatasetCache()`
    `IgniteCache<K,V>` | `getUpstreamCache()`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

    - ### Methods inherited from interface org.apache.ignite.ml.dataset.Dataset

      `compute, compute, compute, compute, compute, computeWithCtx, computeWithCtx, computeWithCtx, computeWithCtx, computeWithCtx, wrap`

- - ### Constructor Detail

    - #### CacheBasedDataset

          public CacheBasedDataset(Ignite ignite,
                                   IgniteCache<K,V> upstreamCache,
                                   IgniteBiPredicate<K,V> filter,
                                   UpstreamTransformerBuilder upstreamTransformerBuilder,
                                   IgniteCache<Integer,C> datasetCache,
                                   LearningEnvironmentBuilder envBuilder,
                                   PartitionDataBuilder<K,V,C,D> partDataBuilder,
                                   UUID datasetId,
                                   boolean upstreamKeepBinary,
                                   LearningEnvironment localLearningEnv,
                                   int retriesCnt)

      Constructs a new instance of dataset based on Ignite Cache, which is used as `upstream` and as reliable storage for partition `context` as well.
      Parameters:
        `ignite` - Ignite instance.
        `upstreamCache` - Ignite Cache with `upstream` data.
        `filter` - Filter for `upstream` data.
        `upstreamTransformerBuilder` - Transformer of upstream data (see description in `DatasetBuilder`).
        `datasetCache` - Ignite Cache with partition `context`.
        `partDataBuilder` - Partition `data` builder.
        `datasetId` - Dataset ID.
        `localLearningEnv` - Local learning environment.
        `retriesCnt` - Number of retries for the case when one of partitions not found on the node where computation is performed.

  - ### Method Detail

    - #### computeWithCtx

          public <R> R computeWithCtx(IgniteTriFunction<C,D,LearningEnvironment,R> map,
                                      IgniteBinaryOperator<R> reduce,
                                      R identity)

      Applies the specified `map` function to every partition `data`, `context` and partition index in the dataset and then reduces `map` results to final result by using the `reduce` function.
      Specified by:
        `computeWithCtx` in interface `Dataset<C extends Serializable,D extends AutoCloseable>`
      Type Parameters:
        `R` - Type of a result.
      Parameters:
        `map` - Function applied to every partition `data`, `context` and `LearningEnvironment`.
        `reduce` - Function applied to results of `map` to get final result.
        `identity` - Identity.
      Returns:
        Final result.

    - #### compute

          public <R> R compute(IgniteBiFunction<D,LearningEnvironment,R> map,
                               IgniteBinaryOperator<R> reduce,
                               R identity)

      Applies the specified `map` function to every partition `data` and `LearningEnvironment` in the dataset and then reduces `map` results to final result by using the `reduce` function.
      Specified by:
        `compute` in interface `Dataset<C extends Serializable,D extends AutoCloseable>`
      Type Parameters:
        `R` - Type of a result.
      Parameters:
        `map` - Function applied to every partition `data` and `LearningEnvironment`.
        `reduce` - Function applied to results of `map` to get final result.
        `identity` - Identity.
      Returns:
        Final result.

    - #### close

          public void close()

      Specified by:
        `close` in interface `AutoCloseable`

    - #### getUpstreamCache

          public IgniteCache<K,V> getUpstreamCache()

    - #### getDatasetCache

          public IgniteCache<Integer,C> getDatasetCache()

2020 Copyright © Apache Software Foundation
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Ignite Database and Caching Platform | : ver. 2.9.1
Release Date | : December 9 2020