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Review of development for ptychography algorithm

Pan Xin-Yu Bi Xiao-Xue Dong Zheng Geng Zhi Xu Han Zhang Yi Dong Yu-Hui Zhang Cheng-Long

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Review of development for ptychography algorithm

Pan Xin-Yu, Bi Xiao-Xue, Dong Zheng, Geng Zhi, Xu Han, Zhang Yi, Dong Yu-Hui, Zhang Cheng-Long
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  • With the development of synchrotron radiation technology and the improvement of light source coherence, ptychography has developed rapidly. Ptychography algorithm solves the problems of slow convergence and easily falls into the local optimal solution and stagnation of the traditional coherent diffraction imaging algorithm. It has the advantages of large imaging field of view, robustness of algorithm, high tolerance to error and wide range of applications, and is becoming a hot research direction in the field of coherent diffraction imaging. Ptychography reconstructs the complex amplitude distribution and illumination light of the sample by iterative algorithms, which can theoretically reach the resolution of the diffraction limit. It has excellent applications in the fields of wavefront detection, phase imaging and optical metrology. This paper first introduces the background of the proposed ptychography algorithm and briefly describes the problem of coherent diffraction imaging algorithm and its development, and then summarizes the development of ptychography algorithm in detail, mainly including the mainstream algorithm of ptychography and its kernel. This paper then describes in detail the improvement of algorithms corresponding to the improvement of the efficiency of ptychography experiments, correction of position errors and the effect of illumination light multi-modal, and elaborates the algorithm flow. After analyzing the possible intersection of diffraction imaging and neural networks in the field of artificial intelligence, this paper introduces new algorithms with combining ptychography with artificial intelligence. New algorithms with combining ptychography with neural networks will have new potential applications in generality, accuracy and robustness. Finally, a specific parallelization implementation of the ptychography algorithm and common software packages are presented. The logic for writing the parallelization of the algorithm implementation of each package and the corresponding advantages and disadvantages of the packages are described in detail. The characteristics and performance of each package are then listed for reference. This paper helps to establish a global perspective of the algorithm itself, artificial intelligence and computational methods in the field of ptychography, and presents an important reference for systematically developing the ptychography method.
      Corresponding author: Zhang Cheng-Long, zhangchl@ihep.ac.cn
    • Funds: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant Nos. 12005253, 12205328) and the Innovation Foundation, Institute of High Energy Physics, Chinese Academy of Sciences, China (Grant No. E25455U210).
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  • 图 1  (a) Ptychography的基本光路图; (b) PIE算法对应的算法流程和重建结果[12]; (c) DM算法对应的算法流程和重建结果[21]

    Figure 1.  (a) Schematic diagram of the basic optical path of ptychography; (b) the corresponding algorithmic flow and reconstruction results of the PIE algorithms[12]; (c) the corresponding algorithmic flow and reconstruction results of the DM algorithms[21].

    图 2  (a) fly-PIE的原理示意图[26]; (b) SSP算法原理示意图[27]; (c) fly-PIE算法单模态和多模态的重建图像对比; (d) SSP实验对强散射样品和蜜蜂翅膀的光斑、模量和相位结果

    Figure 2.  (a) Diagram of fly-PIE[26]; (b) diagram of SSP[27]; (c) comparison of reconstructed images of fly-PIE algorithm using single and multi-modal; (d) probe, modulus, and phase results of the SSP experiment for stronger scattered samples and the bee wings.

    图 3  (a) 3PIE 算法的示意图[37]; (b) 使用 3D-ptychography技术对部分纸张组织的图像采集结果[37] (图(b)前两幅是上层组织的模量和相位, 后两幅是下层组织的模量和相位)

    Figure 3.  (a) Schematic diagram of the 3PIE algorithm[37]; (b) the result of image acquisition of some paper tissues using the 3D-ptychography technique[37] (The first two pictures shows the modulus and phase of the upper tissue, and the last two shows the modulus and phase of the lower tissue in Fig. (b)).

    图 4  (a) 多模态产生原因的示意图和多模态重建图[47] (其中模糊的图片为单模态重建,下方为探针的 5 个主要模态); (b) 单层WS2样品在不同电子剂量条件下单模态和多模态的重建图像[49]; (c), (d) 分别使用OPRP算法和ePIE算法的重建结果和探针的4个主要模态占比[48]

    Figure 4.  (a) Schematic diagram of the causes of multimodal generation and the multimodal reconstruction[47] (The blurred image is the unimodal reconstruction, and the 5 main modes of the probe are shown below); (b) the reconstructed images of unimodal and multimodal reconstructions of the monolayer WS2 sample under different electron dose conditions[49]; (c), (d) the reconstruction results using OPRP algorithm and ePIE algorithm respectively and the four major mode occupancies of the probe[48]

    图 5  位置误差对图像重建质量影响示意图[43] (a) 对应图(b)—(e)的探针位置; (b) 随机位置误差重建的结果; (c) 探针逆时针倾斜重建的结果; (d) 探针漂移重建的结果; (e) 探针位置在垂直方向上有扩展的重建结果

    Figure 5.  Diagram of the effect of position error on image reconstruction quality[43]: (a) Probe positions in Fig. (b)–(e); (b) result of the random position error reconstruction; (c) result of counterclockwise tilt of the probe reconstruction; (d) result of the probe drift reconstruction; (e) result of the reconstruction of the probe position with extension in the vertical direction.

    图 6  退火算法示意图及其位置修正和重建结果的对比[53], 左图为退火算法与ePIE算法重建对比; 右图为e-pcPIE算法的重建对比, 其中图(c)是ePIE的重建结果, 图(d)是退火算法重建结果, 图(e)是e-pcPIE算法重建结果. 全局修正e-pcPIE算法在重建图像和误差上的表现都比退火算法好

    Figure 6.  Schematic diagram of the annealing algorithm and comparison of its position correction and reconstruction results[53]. The left figure shows the reconstruction comparison between annealing algorithm and ePIE algorithm.The right figure shows the reconstruction comparison of e-pcPIE algorithm, where Fig. (c) shows the reconstruction result of ePIE, Fig. (d) shows the reconstruction result of annealing algorithm, and Fig. (e) shows the reconstruction result of e-pcPIE algorithm. The globally corrected e-pcPIE algorithm performs better than the annealing algorithm in both reconstructed images and errors.

    图 7  (a), (b) 在每一个扫描位置xy方向的位置误差[54]; (c), (d) 使用可见光的X射线重建样品图像结果[54]; (e)—(h) 使用调制器的X射线重建样品图像结果[54]; (i),(j) 使用KB镜的X射线重建样品图像结果[54]. 其中图(c), (e), (g), (i)是使用相关匹配算法优化的结果,图(d), (f), (h), (j)是未使用相关匹配算法优化的结果

    Figure 7.  (a), (b) Position errors in the x and y directions at each scan position[54]; (c), (d) X-ray reconstructed sample image results using visible light[54]; (e)—(h) X-ray reconstructed sample image results using modulator[54]; (i), (j) X-ray reconstructed sample image using KB mirror[54]. Fig. (c), (e), (g), (i) and Fig. (d), (f), (h), (j) are the results optimized with and without using the corss-correlation algorithm, respectively.

    图 8  PtychNet 网络架构示意图和重建图像结果[58] (a), (b) 扫描无重叠的图像重建; (c), (d) 扫描有重叠的图像重建

    Figure 8.  Schematic of the PtychNet network architecture and reconstructed image results[58]: (a), (b) The image reconstruction with no overlap of scans; (c), (d) the image reconstruction with overlapping scans.

    图 9  (a)—(d) PtychoNN与ePIE重建的结果对比[66] (a), (c) 使用ePIE算法重建的结果; (b), (d) 使用PtychoNN重建的结果. (e), (f) PtychoNN在少量数据集上的重建质量的对比, 发现在至少800个数据集上可以得到合理结果; (g) PtychoNN网络的结构

    Figure 9.  The left figure above shows and the right figure shows the comparison of the results of the reconstruction of PtychoNN and ePIE[66]: (a), (c) The results of the reconstruction using the ePIE algorithm; (b), (d) the results of the reconstruction using PtychoNN. (e), (f) Comparison the reconstruction quality of PtychoNN on a small number of datasets, and find that reasonable results can be obtained on at least 800 datasets; (g) structure of the PtychoNN network.

    图 10  (a) DIP网络的结构示意图; (b) 使用DIP网络、DM算法与AP 算法重建图像结果的对比[67], 其中DIPcg和DIPvm指两种不同模式的DIP网络. 右上方表格为误差阈值为0.1的情况下各个算法需要的迭代次数和时间, 可以看到DIP网络表现很好. (c) DIP网络运用到MINST库上的测试结果

    Figure 10.  (a) Schematic diagram of the structure of DIP network; (b) the comparison of the reconstructed image results using DIP network, DM algorithm and AP algorithm in reconstructed image results[67], where DIPcg and DIPvm refer to two different modes of DIP networks. The table on the top right shows the number of iterations and time required by each algorithm for an error threshold of 0.1, and we can see that the DIP network performs well. (c) Test results of the DIP network applied to the MINST library.

    图 11  (a), (b) 分别为GPU异步并行和同步并行的数据处理示意图[71]; (c), (d) 分别为Ptychopy软件的工作流程图和GUI界面[52]

    Figure 11.  (a), (b) Schematic diagrams of data processing with GPU asynchronous parallelism and synchronous parallelism, respectively[71]; (c), (d) the workflow diagram and GUI interface of the Ptychopy software, respectively[52].

    图 12  (a) 左图为使用Ptychopy在同一数据集上测试不同的迭代次数的软件速度, 右图为使用PyNX测试模拟数据, 分别处理200, 500, 1000, 3000张探针大小为256×256的数据集. 横坐标代表数据的大小, 纵坐标代表算法实现的时间 (每一步DM算法会分批次计算LLK(log-likehood)). (b) SHARP的GPU并行示意图和重建流程图[74]. (c) 左图为PyNX重建样品的部分相位图, 右图为分配给不同 GPU的扫描位置, 部分位置的信息将共享[72]

    Figure 12.  (a) The left figure in (a) shows the software speedup using Ptychopy to test different number of iterations on the same dataset, and the right figure shows the simulated data using PyNX to test and process 200, 500, 1000, and 3000 datasets with probe size of 256×256, respectively. The horizontal coordinate represents the size of the data, and the vertical coordinate represents the implementation time of the algorithm (LLK (log-likehood) is computed in batches for each DM algorithm step). (b) GPU parallelism of SHARP and the reconstruction flow chart[74]. (c) The left figure in (c) shows the partial phase map of the PyNX reconstructed sample, and the right figure shows the scan positions assigned to different GPUs, and the information of some positions will be shared[72].

    图 13  Ptypy软件的API控制与实验对应示意图[51], 其中Pod是封装好得到可调用包

    Figure 13.  Diagram of the API control of the Ptypy corresponding to the experiment step[51], where Pod is wrapped to get the callable package.

    表 1  部分软件计算的硬件信息、使用软件的算法对单次迭代计算时间的估计值[76], 以及使用A100 GPU的性能速度预测值

    Table 1.  Hardware information for part of the software as well as an estimate of the time for a single iterative computation using the various algorithm[76], and the performance is predicted using the A100 GPU.

    Ptycholib/PtychopyPyNXSHARPPtychoShelves
    集群名Argonne ALCFESRF clusterPSI
    GPU型号NVIDIA K80/A100NVIDIA V100GTX TitanNvidia V100
    算法ePIEDMRAARDM
    单次迭代时间/ns9.3/—2.51.41.03
    Nvidia A100/ns2.8/—0.70.070.3
    DownLoad: CSV

    表 2  不同软件的特点以及标准化重建时间[76]

    Table 2.  Characteristics of different software and standardized reconstruction time[76].

    软件算法支持GPU并行支持GUI界面编程/语言/编译开源标准化重建时间[76]/(ns·ite–1)
    PtychopyDM, ePIE, LSQML$ \surd $$ \surd $Python$ \surd $9.3
    PyNXDM, AP, ML$ \surd $Python$ \surd $2.5
    SHARPRAAR&独立编写$ \surd $$ \surd $1.4
    PtypyDM, ePIE, ML$ \surd $Python
    PtychoShelvesDM, ML$ \surd $Matlab$ \surd $1.03/0.7
    Ptychography4.0独立编写$ \surd $Python$ \surd $
    DownLoad: CSV
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Publishing process
  • Received Date:  28 September 2022
  • Accepted Date:  22 December 2022
  • Available Online:  05 January 2023
  • Published Online:  05 March 2023

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