如何在新版本caffe里添加新的一层

发布网友发布时间：2022-04-23 05:34

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懂视网时间：2022-05-15 11:03

本文主要为大家分享一篇P关于Layer组件的同步以及减少GPU带宽的问题，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧。

问题：

1) Layer 之间能否进行单独更新，比如其中video 层上面弹出的状态栏场景如何优化；

初步构想每次仅更新video layer或则将video layer 绕过BQ 进行处理。

2）FW 以及GPU对video layer 的常见处理；

3）几个变量的理解；

（1）mCurrentTexture ，nextTextureImage；

（2）BufferItem，BufferQueue,mslots；slot，mqueuedframe，mqueuedItem；

（3）syncForReleaseLocked，updateAndReleaseLocked，releaseBufferLocked，releaseBuffer

（4）

/ acquireBuffer attempts to acquire ownership of the next pending buffer in the BufferQueue.
// If no buffer is pending then it returns NO_BUFFER_AVAILABLE. If a buffer is successfully
// acquired, the information about the buffer is returned in BufferItem.
//
// If the buffer returned had previously been acquired then the BufferItem::mGraphicBuffer field
// of buffer is set to NULL and it is assumed that the consumer still holds a reference to the
// buffer.
//
// If presentWhen is non-zero, it indicates the time when the buffer will be displayed on
// screen. If the buffer's timestamp is farther in the future, the buffer won't be acquired, and
// PRESENT_LATER will be returned. The presentation time is in nanoseconds, and the time base
// is CLOCK_MONOTONIC.
//
// If maxFrameNumber is non-zero, it indicates that acquireBuffer should only return a buffer
// with a frame number less than or equal to maxFrameNumber. If no such frame is available
// (such as when a buffer has been replaced but the consumer has not received the
// onFrameReplaced callback), then PRESENT_LATER will be returned.
//
// Return of NO_ERROR means the operation completed as normal.
//
// Return of a positive value means the operation could not be completed at this time, but the
// user should try again later:
// * NO_BUFFER_AVAILABLE - no buffer is pending (nothing queued by producer)
// * PRESENT_LATER - the buffer's timestamp is farther in the future
//
// Return of a negative value means an error has occurred:
// * INVALID_OPERATION - too many buffers have been acquired

 // Returned by releaseBuffer, after which the consumer must free any references to the
  // just-released buffer that it might have.
  STALE_BUFFER_SLOT = 1,
  // Returned by dequeueBuffer if there are no pending buffers available.
  NO_BUFFER_AVAILABLE,
  // Returned by dequeueBuffer if it's too early for the buffer to be acquired.
  PRESENT_LATER,

（5）mslots 与mframe 以及mframenumber 的区别

（6）onframavailable 和latchbuffer ，reject，updateteximage，的逻辑。

其中updateteximage；

(7)bufferitem 与mslots的区别

(8)bufferqueueconsumer 与bufferitemconsumer区别；

（9）acquirebuffer的fence 逻辑，fencefd是哪来的；

fence 相关接口定义参见ui/Fence.h

 status_t Fence::waitForever(const char* logname) { ATRACE_CALL();
 if (mFenceFd == -1) {
  return NO_ERROR;
 }
 int warningTimeout = 3000;
 int err = sync_wait(mFenceFd, warningTimeout);
 if (err < 0 && errno == ETIME) {
  ALOGE("%s: fence %d didn't signal in %u ms", logname, mFenceFd,
   warningTimeout);
  err = sync_wait(mFenceFd, TIMEOUT_NEVER);
 }
 return err < 0 ? -errno : status_t(NO_ERROR);
 }

 struct EglSlot {
  EglSlot() : mEglFence(EGL_NO_SYNC_KHR) {}
  // mEglImage is the EGLImage created from mGraphicBuffer.
  sp<EglImage> mEglImage;
  // mFence is the EGL sync object that must signal before the buffer
  // associated with this buffer slot may be dequeued. It is initialized
  // to EGL_NO_SYNC_KHR when the buffer is created and (optionally, based
  // on a compile-time option) set to a new sync object in updateTexImage.
  EGLSyncKHR mEglFence;
 };

（10）

updateAndReleaseLocked(item, &mPendingRelease)，

updateAndReleaseLocked(item)，

bindTextureImageLocked()

热心网友时间：2022-05-15 08:11

1、属于哪个类型的layer，就打开哪个hpp文件，这里就打开vision_layers.hpp，然后自己添加该layer的定义，或者直接复制Convolution_Layer的相关代码来修改类名和构造函数名都改为Aaa_Layer，如果不用GPU，将*_gpu的声明都去掉。
2、实现自己的layer，编写Aaa_Layer.cpp，加入到src/caffe/layers，主要实现Setup、Forward_cpu、Backward_cpu。

3、如果需要GPU实现，那么在Aaa_Layer.cu中实现Forward_gpu和Backward_gpu。

4、修改src/caffe/proto/caffe.proto，好到LayerType，添加Aaa，并更新ID，如果Layer有参数，添加AaaParameter类。

5、在src/caffe/layer_factory.cpp中添加响应代码。

6、在src/caffe/test中写一个test_Aaa_layer.cpp，用include/caffe/test/test_gradient_check_util.hpp来检查前向后向传播是否正确。

热心网友时间：2022-05-15 09:29

你说的添加到资料库的铃声，是你已经做好的m4r格式的40秒的铃声，还是mp3格式的完整歌曲?你问题要写明白，我们才好回答吖哈哈哈。。。顺便回答520，itunes是可以同步铃声的，只是制作铃声略为复杂，不过熟能生巧，做个铃声几十秒钟就搞定了。。

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如何在新版本caffe里添加新的一层