| /* |
| * 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.iotdb.tsfile.encoding.fire; |
| |
| public class IntFire extends Fire<Integer> { |
| |
| public IntFire(int learning_rate) { |
| super(learning_rate); |
| bitWidth = 8; |
| accumulator = 0; |
| delta = 0; |
| } |
| |
| public void reset() { |
| accumulator = 0; |
| delta = 0; |
| } |
| |
| @Override |
| public Integer predict(Integer value) { |
| // calculate the parameter alpha |
| int alpha = accumulator >> learnShift; |
| // calculate the Incremental of last value in current prediction |
| int diff = (alpha * delta) >> bitWidth; |
| return value + diff; |
| } |
| |
| @Override |
| public void train(Integer pre, Integer val, Integer err) { |
| // update the gradient of learning machine. |
| int gradient = err > 0 ? -delta : delta; |
| accumulator -= gradient; |
| delta = val - pre; |
| } |
| } |