walterddr commented on a change in pull request #9413: [FLINK-13676][ml] Add class of Vector to Columns mapper URL: https://github.com/apache/flink/pull/9413#discussion_r366658844
########## File path: flink-ml-parent/flink-ml-lib/src/main/java/org/apache/flink/ml/common/dataproc/vector/VectorToColumnsMapper.java ########## @@ -0,0 +1,104 @@ +/* + * 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. + */ + +package org.apache.flink.ml.common.dataproc.vector; + +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.common.typeinfo.Types; +import org.apache.flink.ml.api.misc.param.Params; +import org.apache.flink.ml.common.linalg.DenseVector; +import org.apache.flink.ml.common.linalg.SparseVector; +import org.apache.flink.ml.common.linalg.Vector; +import org.apache.flink.ml.common.mapper.Mapper; +import org.apache.flink.ml.common.utils.OutputColsHelper; +import org.apache.flink.ml.common.utils.TableUtil; +import org.apache.flink.ml.params.dataproc.vector.VectorToColumnsParams; +import org.apache.flink.table.api.TableSchema; +import org.apache.flink.types.Row; + +/** + * This mapper maps vector to table columns. + */ +public class VectorToColumnsMapper extends Mapper { + private int colSize; + private int idx; + private OutputColsHelper outputColsHelper; + + public VectorToColumnsMapper(TableSchema dataSchema, Params params) { + super(dataSchema, params); + String selectedColName = this.params.get(VectorToColumnsParams.SELECTED_COL); + idx = TableUtil.findColIndex(dataSchema.getFieldNames(), selectedColName); + if (idx < 0) { + throw new IllegalArgumentException("Can not find column: " + selectedColName); + } + String[] outputColNames = this.params.get(VectorToColumnsParams.OUTPUT_COLS); + if (outputColNames == null) { + throw new IllegalArgumentException("VectorToTable: outputColNames must set."); + } + this.colSize = outputColNames.length; + TypeInformation[] types = new TypeInformation[colSize]; + for (int i = 0; i < colSize; ++i) { + types[i] = Types.DOUBLE; + } + this.outputColsHelper = new OutputColsHelper(dataSchema, outputColNames, types, + this.params.get(VectorToColumnsParams.RESERVED_COLS)); + } + + @Override + public Row map(Row row) { + Row result = new Row(colSize); + Object obj = row.getField(idx); + if (null == obj) { + for (int i = 0; i < colSize; i++) { + result.setField(i, null); + } + return outputColsHelper.getResultRow(row, result); + } + + Vector vec = (Vector) obj; + + if (vec instanceof SparseVector) { + for (int i = 0; i < colSize; ++i) { + result.setField(i, 0.0); + } + SparseVector sparseVector = (SparseVector) vec; + int nnz = sparseVector.numberOfValues(); + int[] indices = sparseVector.getIndices(); + double[] values = sparseVector.getValues(); + for (int i = 0; i < nnz; ++i) { + if (indices[i] < colSize) { + result.setField(indices[i], values[i]); + } else { + break; Review comment: ``` int i = 0; while (indices[i] < colSize) { result.setField(indices[i], values[i]); I++; } ``` also, are we always assume users' sparse vector indices larger than colSize can be ignored? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
