复制代码public interface EchoService {
    String echo(String ping);
}

复制代码public class EchoServiceImpl implements EchoService {
    @Override
    public String echo(String ping) {
        return ping != null ? ping + "--> I am OK." : " I am OK.";
    }
}

复制代码import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Method;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

/**
 * Created by lbd on 2017/11/12.
 */
public class RpcExporter {
    static Executor executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    public static void exporter(String hostName, int port) throws Exception {
        ServerSocket server = new ServerSocket();
        server.bind(new InetSocketAddress(hostName, port));
        try {
            while (true) {
                executor.execute(new ExporterTask(server.accept()));
            }
        } finally {
            server.close();
        }
    }

    private static class ExporterTask implements Runnable {
        Socket client = null;

        public ExporterTask(Socket client) {
            this.client = client;
        }

        @Override
        public void run() {
            ObjectInputStream input = null;
            ObjectOutputStream output = null;

            try {
                input = new ObjectInputStream(client.getInputStream());
                String interfaceName = input.readUTF();
                Class<?> service = Class.forName(interfaceName);
                String methodName = input.readUTF();
                Class<?>[] parameterTypes = (Class<?>[])input.readObject();
                Object[] arguments = (Object[])input.readObject();
                Method method = service.getMethod(methodName, parameterTypes);
                Object result = method.invoke(service.newInstance(), arguments);
                output = new ObjectOutputStream(client.getOutputStream());
                output.writeObject(result);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (output != null)
                    try {
                        output.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                if (input != null)
                    try {
                        input.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

            }
        }
    }
}

复制代码import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.net.InetSocketAddress;
import java.net.Socket;

/**
 * Created by lbd on 2017/11/12.
 */
public class RpcImporter<S> {
    public S importer(final Class<?> serviceClass, final InetSocketAddress addr) {
        return (S) Proxy.newProxyInstance(serviceClass.getClassLoader(), new Class<?>[]{serviceClass.getInterfaces()[0]},
                new InvocationHandler() {
                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                        Socket socket = null;
                        ObjectOutputStream output = null;
                        ObjectInputStream input = null;
                        try {
                            socket = new Socket();
                            socket.connect(addr);
                            output = new ObjectOutputStream(socket.getOutputStream());
                            output.writeUTF(serviceClass.getName());
                            output.writeUTF(method.getName());
                            output.writeObject(method.getParameterTypes());
                            output.writeObject(args);
                            input = new ObjectInputStream(socket.getInputStream());
                            return input.readObject();
                        } finally {
                            if (socket != null)
                                socket.close();
                            if (output != null)
                                output.close();
                            if (input != null)
                                input.close();
                        }
                    }
                });
    }
}

复制代码import java.net.InetSocketAddress;

/**
 * Created by lbd on 2017/11/12.
 */
public class RpcTest {
    public static void main(String[] args) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    RpcExporter.exporter("localhost", 7890);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();

        RpcImporter<EchoService> proxyImporter = new RpcImporter<>();
        EchoService echoService = proxyImporter.importer(EchoServiceImpl.class, new InetSocketAddress("localhost", 7890));
        System.out.println(echoService.echo("Are you ok ?"));
    }
}

复制代码Are you ok ?--> I am OK.

复制代码public class AdapterDP {
    public static void main(String[] args) {
        AppleLightning appleLighting = new AppleLightning();
        System.out.println("use lightning to charge");
        appleLighting.chargeWithLightning();

        System.out.println('\n' + "use type-c to charge");
        AndroidTypeC androidTypeC = new AndroidTypeC();
        androidTypeC.chargeWithTypeC();

        System.out.println('\n' + "use lightning to charge");
        Lightning adapter = new Adapter(androidTypeC);
        adapter.chargeWithLightning();
    }


}

interface Lightning {
    void chargeWithLightning();
}

class AppleLightning implements Lightning {
    public void chargeWithLightning() {
        System.out.println("charging iPhone...");
    }
}

class AndroidTypeC {
    public void chargeWithTypeC() {
        System.out.println("charging android...");
    }
}

class Adapter implements Lightning {
    public AndroidTypeC androidTypeC;

    public Adapter(AndroidTypeC androidTypeC) {
        this.androidTypeC = androidTypeC;
    }

    public void chargeWithLightning() {
        androidTypeC.chargeWithTypeC();
    }

}

复制代码use lightning to charge
charging iPhone...

use type-c to charge
charging android...

use lightning to charge
charging android...

复制代码java.lang.RuntimeException: level 2 exception
    at com.msh.demo.exceptionStack.Test.fun2(Test.java:17)
    at com.msh.demo.exceptionStack.Test.main(Test.java:24)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: java.io.IOException: level 1 exception
    at com.msh.demo.exceptionStack.Test.fun1(Test.java:10)
    at com.msh.demo.exceptionStack.Test.fun2(Test.java:15)
    ... 6 more

复制代码package com.msh.demo.exceptionStack;

import java.io.IOException;

/**
 * Created by monkeysayhi on 2017/10/1.
 */
public class Test {
  private void fun1() throws IOException {
    throw new IOException("level 1 exception");
  }

  private void fun2() {
    try {
      fun1();
    } catch (IOException e) {
        throw new RuntimeException("level 2 exception", e);
    }
  }


  public static void main(String[] args) {
    try {
      new Test().fun2();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

复制代码...
    public void printStackTrace() {
        printStackTrace(System.err);
    }
...
    public void printStackTrace(PrintStream s) {
        printStackTrace(new WrappedPrintStream(s));
    }
...
    private void printStackTrace(PrintStreamOrWriter s) {
        // Guard against malicious overrides of Throwable.equals by
        // using a Set with identity equality semantics.
        Set<Throwable> dejaVu =
            Collections.newSetFromMap(new IdentityHashMap<Throwable, Boolean>());
        dejaVu.add(this);

        synchronized (s.lock()) {
            // Print our stack trace
            s.println(this);
            StackTraceElement[] trace = getOurStackTrace();
            for (StackTraceElement traceElement : trace)
                s.println("\tat " + traceElement);

            // Print suppressed exceptions, if any
            for (Throwable se : getSuppressed())
                se.printEnclosedStackTrace(s, trace, SUPPRESSED_CAPTION, "\t", dejaVu);

            // Print cause, if any
            Throwable ourCause = getCause();
            if (ourCause != null)
                ourCause.printEnclosedStackTrace(s, trace, CAUSE_CAPTION, "", dejaVu);
        }
    }
...

复制代码            s.println(this);

复制代码...
    public String toString() {
        String s = getClass().getName();
        String message = getLocalizedMessage();
        return (message != null) ? (s + ": " + message) : s;
    }
...
    public String getLocalizedMessage() {
        return getMessage();
    }
...
    public String getMessage() {
        return detailMessage;
    }
...

复制代码  public String toString() {
    return this.getValue().equals("https")?"BadFieldException[ " + this.getRealMessage() + "]":"BadFieldException[ " + this.getField() + "," + this.getValue() + "]";
  }

复制代码public interface LockProvider {

    /**
     * @return If empty optional has been returned, lock could not be acquired. The lock
     * has to be released by the callee.
     */
    Optional<SimpleLock> lock(LockConfiguration lockConfiguration);
}

复制代码public class StorageBasedLockProvider implements LockProvider {
    private final StorageAccessor storageAccessor;
    private final LockRecordRegistry lockRecordRegistry = new LockRecordRegistry();

    protected StorageBasedLockProvider(StorageAccessor storageAccessor) {
        this.storageAccessor = storageAccessor;
    }

    @Override
    public Optional<SimpleLock> lock(LockConfiguration lockConfiguration) {
        boolean lockObtained = doLock(lockConfiguration);
        if (lockObtained) {
            return Optional.of(new StorageLock(lockConfiguration, storageAccessor));
        } else {
            return Optional.empty();
        }
    }

    /**
     * Sets lockUntil according to LockConfiguration if current lockUntil &lt;= now
     */
    protected boolean doLock(LockConfiguration lockConfiguration) {
        String name = lockConfiguration.getName();

        if (!lockRecordRegistry.lockRecordRecentlyCreated(name)) {
            // create document in case it does not exist yet
            if (storageAccessor.insertRecord(lockConfiguration)) {
                lockRecordRegistry.addLockRecord(name);
                return true;
            }
            lockRecordRegistry.addLockRecord(name);
        }

        return storageAccessor.updateRecord(lockConfiguration);
    }

    private static class StorageLock implements SimpleLock {
        private final LockConfiguration lockConfiguration;
        private final StorageAccessor storageAccessor;

        StorageLock(LockConfiguration lockConfiguration, StorageAccessor storageAccessor) {
            this.lockConfiguration = lockConfiguration;
            this.storageAccessor = storageAccessor;
        }

        @Override
        public void unlock() {
            storageAccessor.unlock(lockConfiguration);
        }
    }

}

复制代码/**
 * Executes task if not locked.
 */
public interface LockManager {
    void executeWithLock(Runnable task);
}

复制代码public class DefaultLockManager implements LockManager {
    private static final Logger logger = LoggerFactory.getLogger(DefaultLockManager.class);

    private final LockingTaskExecutor lockingTaskExecutor;
    private final LockConfigurationExtractor lockConfigurationExtractor;

    public DefaultLockManager(LockProvider lockProvider, LockConfigurationExtractor lockConfigurationExtractor) {
        this(new DefaultLockingTaskExecutor(lockProvider), lockConfigurationExtractor);
    }

    public DefaultLockManager(LockingTaskExecutor lockingTaskExecutor, LockConfigurationExtractor lockConfigurationExtractor) {
        this.lockingTaskExecutor = requireNonNull(lockingTaskExecutor);
        this.lockConfigurationExtractor = requireNonNull(lockConfigurationExtractor);
    }

    @Override
    public void executeWithLock(Runnable task) {
        Optional<LockConfiguration> lockConfigOptional = lockConfigurationExtractor.getLockConfiguration(task);
        if (!lockConfigOptional.isPresent()) {
            logger.debug("No lock configuration for {}. Executing without lock.", task);
            task.run();
        } else {
            lockingTaskExecutor.executeWithLock(task, lockConfigOptional.get());
        }
    }
}

}

public class LockableTaskScheduler implements TaskScheduler, DisposableBean {  
 private final TaskScheduler taskScheduler;  
 private final LockManager lockManager;

}

@Bean  
 public ScheduledLockConfiguration scheduledLockConfiguration(LockProvider lockProvider) {  
 return ScheduledLockConfigurationBuilder  
 .withLockProvider(lockProvider)  
 .withPoolSize(10)  
 .withDefaultLockAtMostFor(Duration.ofMinutes(10))  
 .build();  
 }

复制代码-H tcp://127.0.0.1:4243 -H unix:///var/run/docker.sock

复制代码docker -H tcp://192.168.1.123:2345 ps
docker -H tcp://192.168.1.123:2345 images
docker -H tcp://192.168.1.123:2345 run ...

复制代码docker-machine create --driver virtualbox manager1

复制代码docker-machine ls
NAME       ACTIVE   DRIVER       STATE     URL                         SWARM   DOCKER        ERRORS
manager1   -        virtualbox   Running   tcp://192.168.99.100:2376           v17.06.1-ce   
worker1    -        virtualbox   Running   tcp://192.168.99.101:2376           v17.06.1-ce   
worker2    -        virtualbox   Running   tcp://192.168.99.102:2376           v17.06.1-ce

复制代码docker swarm init --listen-addr <MANAGER-IP>:<PORT> --advertise-addr <IP>

复制代码docker-machine ssh manager1 docker swarm init --listen-addr 192.168.99.100:2377 --advertise-addr 192.168.99.100

复制代码Swarm initialized: current node (23lkbq7uovqsg550qfzup59t6) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join \
    --token SWMTKN-1-3z5rzoey0u6onkvvm58f7vgkser5d7z8sfshlu7s4oz2gztlvj-c036gwrakjejql06klrfc585r \
    192.168.99.100:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

复制代码docker-machine ssh worker1 docker swarm join --token \
    SWMTKN-1-3z5rzoey0u6onkvvm58f7vgkser5d7z8sfshlu7s4oz2gztlvj-c036gwrakjejql06klrfc585r \
    192.168.99.100:2377
This node joined a swarm as a worker.

复制代码docker-machine ssh worker2 docker swarm join --token \
    SWMTKN-1-3z5rzoey0u6onkvvm58f7vgkser5d7z8sfshlu7s4oz2gztlvj-c036gwrakjejql06klrfc585r \
    192.168.99.100:2377
This node joined a swarm as a worker.

复制代码docker-machine ssh manager1 docker node ls
NAME     ACTIVE    DRIVER       STATE     URL                         SWARM   DOCKER    ERRORS
manager1   -       virtualbox   Running   tcp://192.168.99.100:2376           v1.12.3   
worker1    -       virtualbox   Running   tcp://192.168.99.101:2376           v1.12.3   
worker2    -       virtualbox   Running   tcp://192.168.99.102:2376           v1.12.3

复制代码docker-machine ssh manager1 docker network ls
NETWORK ID         NAME            DRIVER          SCOPE
764ff31881e5        bridge          bridge          local                  
fbd9a977aa03        host            host            local               
6p6xlousvsy2        ingress         overlay         swarm            
e81af24d643d        none            null            local

复制代码docker-machine ssh manager1 docker network create --driver overlay swarm_test

复制代码docker-machine ssh manager1 docker pull registry.cn-qingdao.aliyuncs.com/marklux/judge_server:1.0
docker-machine ssh worker1 docker pull registry.cn-qingdao.aliyuncs.com/marklux/judge_server:1.0
docker-machine ssh worker2 docker pull registry.cn-qingdao.aliyuncs.com/marklux/judge_server:1.0

复制代码docker service create --replicas 3 --name judge_swarm -p 8090:8090 --network=swarm_test registry.cn-qingdao.aliyuncs.com/marklux/judge_server:1.0

复制代码docker service ls
ID                  NAME                MODE                REPLICAS            IMAGE                                                       PORTS
kofcno637cmq        judge_swarm         replicated          3/3                 registry.cn-qingdao.aliyuncs.com/marklux/judge_server:1.0   *:8090->8090/tcp

复制代码int execl(const char * path,const chr * arg,...)

复制代码int ret;

ret = execl("/bin/vi","vi",NULL);

if (ret == -1) {
    perror("execl");
}

复制代码int ret;

ret = execl("/bin/vi","vi","/home/mark/a.txt",NULL);

if (ret == -1) {
    perror("execl");
}

复制代码vi /home/mark/a.txt

复制代码pid_t fork(void)

复制代码#include <unistd.h>
#include <stdio.h>
int main ()
{
    pid_t fpid; //fpid表示fork函数返回的值
    int count=0;

    printf("this is a process\n");

    fpid=fork();

    if (fpid < 0)
        printf("error in fork!");
    else if (fpid == 0) {
        printf("i am the child process, my process id is %d\n",getpid());
        printf("我是爹的儿子\n");
        count++;
    }
    else {
        printf("i am the parent process, my process id is %d\n",getpid());
        printf("我是孩子他爹\n");
        count++;
    }
    printf("统计结果是: %d\n",count);
    return 0;
}

复制代码this is a process
i am the parent process, my process id is 21448
我是孩子他爹
统计结果是: 1
i am the child process, my process id is 21449
我是爹的儿子
统计结果是: 1

复制代码pid_t pid;

pid = fork();

if (pid == -1)
    perror("fork");

//子进程
if (!pid) {
    const char * args[] = {"windlass",NULL};

    int ret;

    // 参数以数组方式传入
    ret = execv("/bin/windlass",args);

    if (ret == -1) {
        perror("execv");
        exit(EXIT_FAILURE);
    }
}

复制代码void exit (int status)

复制代码pid_t wait(int * status);

复制代码pid_t waitpid(pid_t pid,int * status,int options);

复制代码int system(const char * command);

复制代码int my_system(const char * cmd)
{
    int status;
    pid_t pid;

    pid = fork();

    if (pid == -1) {
        return -1;
    }

    else if (pid == 0) {
        const char * argv[4];

        argv[0] = "sh";
        argv[1] = "-c";
        argv[2] = cmd;
        argv[3] = NULL;

        execv("bin/sh",argv);
        // 这传参调用好像有类型转换问题

        exit(-1);

    }//子进程

    //父进程
    if (waitpid(pid,&status,0) == -1)
        return -1;
    else if (WIFEXITED(status))
        return WEXITSTATUS(status);

    return -1;
}

复制代码$cat ship-inventory.txt | grep booty|sort

复制代码int daemon(int nochdir,int noclose);

复制代码  x++;

复制代码<?php

class Template {
    private $templatePath;
    private $data;

    public function setTemplatePath($path) {
        $this->templatePath = $path;
    }

    /**
     * 设置模板变量
     * @param $key string | array
     * @param $value
     */
    public function assign($key, $value) {
        if(is_array($key)) {
            $this->data = array_merge($this->data, $key);
        } elseif(is_string($key)) {
            $this->data[$key] = $value;
        }
    }


    /**
     * 渲染模板
     * @param $template
     * @return string
     */
    public function display($template) {
        extract($this->data);
        ob_start();
        include ($this->templatePath . $template);
        $res = ob_get_contents();
        ob_end_clean();
        return $res;
    }

}

复制代码<?php

 include_once './template.php';

 $template = new Template();
 $template->setTemplatePath(__DIR__ . '/template/');
 $template->assign('name', 'salamander');
 $res = $template->display('index.html');


 echo $res;

复制代码<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>模板测试</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }
        h1 {
            text-align: center;
            padding-top: 20px;
        }
    </style>
</head>
<body>
    <h1><?=$name?></h1>
</body>
</html>

apache复制代码f(x) = x^3 + 2 * x - 3

subunit复制代码error = (f(x) - 0)^2

apache复制代码derivative(x) = 6 * x^5 + 16 * x^3 - 18 * x^2 + 8 * x - 12

abnf复制代码x = x - reate * derivative

repl复制代码>>> def f(x):
...     return x**3 + 2 * x - 3
...
>>> def error(x):
...     return (f(x) - 0)**2
...
>>> def gradient_descent(x):
...     delta = 0.00000001
...     derivative = (error(x + delta) - error(x)) / delta
...     rate = 0.01
...     return x - rate * derivative
...
>>> x = 0.8
>>> for i in range(50):
...     x = gradient_descent(x)
...     print('x = {:6f}, f(x) = {:6f}'.format(x, f(x)))
...

apache复制代码x = 0.869619, f(x) = -0.603123
x = 0.921110, f(x) = -0.376268
x = 0.955316, f(x) = -0.217521
x = 0.975927, f(x) = -0.118638
x = 0.987453, f(x) = -0.062266
x = 0.993586, f(x) = -0.031946
x = 0.996756, f(x) = -0.016187
x = 0.998369, f(x) = -0.008149
x = 0.999182, f(x) = -0.004088
x = 0.999590, f(x) = -0.002048
x = 0.999795, f(x) = -0.001025
x = 0.999897, f(x) = -0.000513
x = 0.999949, f(x) = -0.000256
x = 0.999974, f(x) = -0.000128
x = 0.999987, f(x) = -0.000064
x = 0.999994, f(x) = -0.000032
x = 0.999997, f(x) = -0.000016
x = 0.999998, f(x) = -0.000008
x = 0.999999, f(x) = -0.000004
x = 1.000000, f(x) = -0.000002
x = 1.000000, f(x) = -0.000001
x = 1.000000, f(x) = -0.000001
x = 1.000000, f(x) = -0.000000
x = 1.000000, f(x) = -0.000000
x = 1.000000, f(x) = -0.000000

apache复制代码f(x) = x[0] + 2 * x[1] + 4

repl复制代码>>> def gradient_descent(x):
...     delta = 0.00000001
...     derivative_x0 = (error([x[0] + delta, x[1]]) - error([x[0], x[1]])) / delta
...     derivative_x1 = (error([x[0], x[1] + delta]) - error([x[0], x[1]])) / delta
...     rate = 0.01
...     x[0] = x[0] - rate * derivative_x0
...     x[1] = x[1] - rate * derivative_x1
...     return [x[0], x[1]]
...

repl复制代码>>> def f(x):
...     return x[0] + 2 * x[1] + 4
...
>>> def error(x):
...     return (f(x) - 0)**2
...
>>> def gradient_descent(x):
...     delta = 0.00000001
...     derivative_x0 = (error([x[0] + delta, x[1]]) - error([x[0], x[1]])) / delta
...     derivative_x1 = (error([x[0], x[1] + delta]) - error([x[0], x[1]])) / delta
...     rate = 0.02
...     x[0] = x[0] - rate * derivative_x0
...     x[1] = x[1] - rate * derivative_x1
...     return [x[0], x[1]]
...
>>> x = [-0.5, -1.0]
>>> for i in range(100):
...     x = gradient_descent(x)
...     print('x = {:6f},{:6f}, f(x) = {:6f}'.format(x[0],x[1],f(x)))
...

apache复制代码x = -0.560000,-1.120000, f(x) = 1.200000
x = -0.608000,-1.216000, f(x) = 0.960000
x = -0.646400,-1.292800, f(x) = 0.768000
x = -0.677120,-1.354240, f(x) = 0.614400
x = -0.701696,-1.403392, f(x) = 0.491520
x = -0.721357,-1.442714, f(x) = 0.393216
x = -0.737085,-1.474171, f(x) = 0.314573
x = -0.749668,-1.499337, f(x) = 0.251658
x = -0.759735,-1.519469, f(x) = 0.201327
x = -0.767788,-1.535575, f(x) = 0.161061
x = -0.774230,-1.548460, f(x) = 0.128849
x = -0.779384,-1.558768, f(x) = 0.103079
x = -0.783507,-1.567015, f(x) = 0.082463
x = -0.786806,-1.573612, f(x) = 0.065971
x = -0.789445,-1.578889, f(x) = 0.052777
x = -0.791556,-1.583112, f(x) = 0.042221
x = -0.793245,-1.586489, f(x) = 0.033777
x = -0.794596,-1.589191, f(x) = 0.027022
x = -0.795677,-1.591353, f(x) = 0.021617
x = -0.796541,-1.593082, f(x) = 0.017294
x = -0.797233,-1.594466, f(x) = 0.013835
x = -0.797786,-1.595573, f(x) = 0.011068
x = -0.798229,-1.596458, f(x) = 0.008854
x = -0.798583,-1.597167, f(x) = 0.007084
x = -0.798867,-1.597733, f(x) = 0.005667
x = -0.799093,-1.598187, f(x) = 0.004533
x = -0.799275,-1.598549, f(x) = 0.003627
x = -0.799420,-1.598839, f(x) = 0.002901
x = -0.799536,-1.599072, f(x) = 0.002321
x = -0.799629,-1.599257, f(x) = 0.001857
x = -0.799703,-1.599406, f(x) = 0.001486
x = -0.799762,-1.599525, f(x) = 0.001188
x = -0.799810,-1.599620, f(x) = 0.000951
x = -0.799848,-1.599696, f(x) = 0.000761
x = -0.799878,-1.599757, f(x) = 0.000608
x = -0.799903,-1.599805, f(x) = 0.000487
x = -0.799922,-1.599844, f(x) = 0.000389
x = -0.799938,-1.599875, f(x) = 0.000312
x = -0.799950,-1.599900, f(x) = 0.000249
x = -0.799960,-1.599920, f(x) = 0.000199
x = -0.799968,-1.599936, f(x) = 0.000159
x = -0.799974,-1.599949, f(x) = 0.000128
x = -0.799980,-1.599959, f(x) = 0.000102
x = -0.799984,-1.599967, f(x) = 0.000082
x = -0.799987,-1.599974, f(x) = 0.000065
x = -0.799990,-1.599979, f(x) = 0.000052
x = -0.799992,-1.599983, f(x) = 0.000042
x = -0.799993,-1.599987, f(x) = 0.000033
x = -0.799995,-1.599989, f(x) = 0.000027
x = -0.799996,-1.599991, f(x) = 0.000021
x = -0.799997,-1.599993, f(x) = 0.000017
x = -0.799997,-1.599995, f(x) = 0.000014
x = -0.799998,-1.599996, f(x) = 0.000011
x = -0.799998,-1.599997, f(x) = 0.000009
x = -0.799999,-1.599997, f(x) = 0.000007
x = -0.799999,-1.599998, f(x) = 0.000006
x = -0.799999,-1.599998, f(x) = 0.000004
x = -0.799999,-1.599999, f(x) = 0.000004
x = -0.799999,-1.599999, f(x) = 0.000003
x = -0.800000,-1.599999, f(x) = 0.000002
x = -0.800000,-1.599999, f(x) = 0.000002
x = -0.800000,-1.599999, f(x) = 0.000001
x = -0.800000,-1.600000, f(x) = 0.000001
x = -0.800000,-1.600000, f(x) = 0.000001
x = -0.800000,-1.600000, f(x) = 0.000001
x = -0.800000,-1.600000, f(x) = 0.000001
x = -0.800000,-1.600000, f(x) = 0.000000

makefile复制代码import tensorflow as tf
 
# Model parameters
W = tf.Variable([.3], dtype=tf.float32)
b = tf.Variable([-.3], dtype=tf.float32)
# Model input and output
x = tf.placeholder(tf.float32)
linear_model = W*x + b
y = tf.placeholder(tf.float32)
 
# loss
loss = tf.reduce_sum(tf.square(linear_model - y)) # sum of the squares
# optimizer
optimizer = tf.train.GradientDescentOptimizer(0.01)
train = optimizer.minimize(loss)
 
# training data
x_train = [1, 2, 3, 4]
y_train = [0, -1, -2, -3]
# training loop
init = tf.global_variables_initializer()
sess = tf.Session()
sess.run(init) # reset values to wrong
for i in range(1000):
  sess.run(train, {x: x_train, y: y_train})
 
# evaluate training accuracy
curr_W, curr_b, curr_loss = sess.run([W, b, loss], {x: x_train, y: y_train})
print("W: %s b: %s loss: %s"%(curr_W, curr_b, curr_loss))

abnf复制代码optimizer = tf.train.GradientDescentOptimizer(0.01)
train = optimizer.minimize(loss)

css复制代码for i in range(1000):
  sess.run(train, {x: x_train, y: y_train})

stylus复制代码W: [-0.21999997] b: [-0.456] loss: 4.01814
W: [-0.39679998] b: [-0.49552] loss: 1.81987
W: [-0.45961601] b: [-0.4965184] loss: 1.54482
W: [-0.48454273] b: [-0.48487374] loss: 1.48251
W: [-0.49684232] b: [-0.46917531] loss: 1.4444
W: [-0.50490189] b: [-0.45227283] loss: 1.4097
W: [-0.5115062] b: [-0.43511063] loss: 1.3761
....
....
....
W: [-0.99999678] b: [ 0.99999058] loss: 5.84635e-11
W: [-0.99999684] b: [ 0.9999907] loss: 5.77707e-11
W: [-0.9999969] b: [ 0.99999082] loss: 5.69997e-11