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What's New in Vitis™ AI

Vitis AI 2.0

Vitis AI 2.0 Release Highlights

  • General Availability (GA) for VCK190 (Production Silicon), VCK5000 (Production Silicon) and U55C
  • Added support for newer Pytorch and Tensorflow version: Pytorch 1.8-1.9, Tensorflow 2.4-2.6
  • 22 additional new models, including Solo, Yolo-X, UltraFast, CLOCs, PSMNet, FairMOT, SESR, DRUNet, SSR as well as 3 NLP models and 2 OFA (Once-for-all) models
  • Added new custom OP flow to run models with DPU un-supported OPs with enhancement across quantizer, compiler and runtime
  • Additional layers and configurations of DPU for VCK190 and DPU for VCK5000
  • Added OFA pruning and TF2 keras support for AI optimizer
  • Run inference directly from Tensorflow (Demo) for cloud DPU

Vitis AI 2.0 What’s New by Category

Expand the sections below to learn more about the new features and enhancements.

  • 22 new models added, 130 total
    • 19 new Pytorch models including 3 NLP and 2 OFA models
    • 3 new Tensorflow models
  • Added new application models
    • AD/ADAS: Solo for instance segmentation, Yolo-X for traffic sign detection, UltraFast for lane detection, CLOCs for sensor fusion
    • Medical: SESR for super resolution, DRUNet for image denoise, SSR for spectral remove
    • Smart city and industrial vision: PSMNet for binocular depth estimation, FairMOT for joint detection and Re-ID
  • EoU Enhancements
    • Updated automatic script to search and download required models
  • TF2 quantizer
    • Add support TF 2.4-2.6
    • Add support for custom OP flow, including shape inference, quantization and dumping
    • Add support for CUDA 11
    • Add support for input_shape assignment when deploying QAT models
    • Improve support for TFOpLambda layers
    • Update support for hardware simulation, including sigmoid layer, leaky_relu layer, global and non-global average pooling layer
    • Bugfixs for sequential models and quantize position adjustment
  • TF1 quantizer
    • Add quantization support for new ops, including hard-sigmoid, hard-swish, element-wise multiply ops
    • Add support for replacing normal sigmoid with hard sigmoid
    • Update support for float weights dumping when dumping golden results
    • Bugfixs for inconsistency of python APIs and cli APIs
  • Pytorch quantizer
    • Add support for pytorch 1.8 and 1.9
    • Support CUDA 11
    • Support custom OP flow
    • Improve fast finetune performance on memory consumption and accuracy
    • Reduce memory consumption by feature map among quantization
    • Improve QAT functions including better initialization of quantization scale and new API for getting quantizer’s parameters
    • Support more quantization of operations: some 1D and 3D ops, DepthwiseConvTranspose2D, pixel-shuffle, pixel-unshuffle, const
    • Support CONV/BN merging in pattern of CONV+CONCAT+BN
    • Some message enhancement to help user locate problem
    • Bugfixs about consistency with hardware
  • TensorFlow 1.15
    • Support tf.keras.Optimizer for model training
  • TensorFlow 2.x
    • Support TensorFlow 2.3-2.6
    • Add iterative pruning
  • PyTorch
    • Support PyTorch 1.4-1.9.1
    • Support shared parameters in pruning
    • Add one-step pruning
    • Add once-for-all(OFA)
    • Unified APIs for iterative and one-step pruning
    • Enable pruned model to be used by quantizer
    • Support nn.Conv3d and nn.ConvTranspose3d
  • DPU on embedded platforms
    • Support and optimize conv3d, transposedconv3d, upsample3d and upsample2d for DPUCVDX8G(xvDPU)
    • Improve the efficiency of high resolution input for DPUCVDX8G(xvDPU)
    • Support ALUv2 new features
  • DPU on Alveo/Cloud
    • Support depthwise-conv2d, h-sigmoid and h-swish for DPUCVDX8H(DPUv4E)
    • Support depthwise-conv2d for DPUCAHX8H(DPUv3E)
    • Support high resolution model inference
  • Support custom OP flow
  • Support all the new models in Model Zoo: end-to-end deployment in Vitis AI Library
  • Improved GraphRunner to better support custom OP flow
  • Add examples on how to integrate custom OPs
  • Add more pre-implemented CPU OPs
  • DPU driver/runtime update to support Xilinx Device Tree Generator (DTG) for Vivado flow
  • Support CPU tasks tracking in graph runner
  • Better memory bandwidth analysis in text summary
  • Better performance to enable the analysis of large models
  • CNN DPU for Zynq SoC / MPSoC, DPUCZDX8G (DPUv2)
    • Upgraded to 2021.2
    • Update interrupt connection in Vivado flow
  • CNN DPU for Alveo-HBM, DPUCAHX8H (DPUv3E)
    • Support depth-wise convolution
    • Support U55C
  • CNN DPU for Alveo-DDR, DPUCADF8H (DPUv3Int8)
    • Updated U200/U250 xlcbins with XRT 2021.2
    • Released XO Flow
    • Released IP Product Guide (PG400)
  • CNN DPU for Versal, DPUCVDX8G (xvDPU)
    • C32 (32-aie cores for a single batch) and C64 (64-aie cores for a single batch) configurable
    • Support configurable batch size 1~5 for C64
    • Support and optimize new OPs: conv3d, transposedconv3d, upsample3d and upsample2d
    • Reduce Conv bubbles and compute redundancy
    • Support 16-bit const weights in ALUv2
  • CNN DPU for Versal, DPUCVDX8H (DPUv4E)
    • Support depth-wise convolution with 6 PE configuration
    • Support h-sigmoid and h-swish
  • Upgrade to Vitis and Vivado 2021.2
  • Custom plugin example: PSMNet using Cost Volume (RTL Based) accelerator on VCK190
  • New accelerator for Optical Flow (TV-L1) on U50
  • High resolution segmentation application on VCK190
  • Options to compare throughput & accuracy between FPGA and CPU Versions
    • Throughput improvements ranging from 25% to 368%
  • Reorganized for better usability and visibility
  • Provides new capability of deploying models with DPU unsupported OPs
    • Define custom OPs in quantization
    • Register and implement custom OPs before the deployment by graph runner
  • Add two examples
    • Pointpillars Pytorch model
    • MNIST Tensorflow 2 model
  • Add support of DPUs for U50 and U55C
  • Run inference directly from Tensorflow framework for cloud DPU
    • Automatically perform subgraph partitioning and apply optimization/acceleration for DPU subgraphs
    • Dispatch non-DPU subgraphs to TensorFlow running on CPU
  • Resnet50 and Yolov3 demos on VCK5000
  • Support xmodel serving in cloud / on-premise (EA)
  • vai_q_caffe hangs when TRAIN and TEST phases point to the same LMDB file
  • TVM compiled Inception_v3 model gives low accuracy with DPUCADF8H (DPUv3Int8)
  • TensorFlow 1.15 quantizer error in QAT caused by an incorrect pattern match
Vitis AI 1.4

Vitis AI 1.4 Release Highlights

  • Support new platforms, including Kria KV260 SoM kit and Versal ACAP platforms VCK190, VCK5000; 
  • Extended Pytorch framework support from version 1.5 to version 1.7.1;
  • Added new state-of-the-art models, including 4D Radar detection, Image-Lidar sensor fusion, 3D detection & segmentation, multi-task, depth estimation, super resolution and more models that applicable to automotive, smart medical, industrial vision applications;
  • Easier subgraph partition user experience with the new Graph Runner API;
  • Improved performance;

Vitis AI 1.4 What’s New by Category

Expand the sections below to learn more about the new features and enhancements in Vitis AI 1.4.

  1. Added 16 new models, and total 108 models from different deep learning frameworks (Caffe, TensorFlow, TensorFlow 2 and PyTorch) are provided.
  2. Increased the diversity of models compared to Vitis AI 1.3:
    1. For autonomous driving and ADAS, added 4D Radar detection, Image-Lidar sensor fusion, surround-view 3D detection, upgraded 3D segmentation and multi-task models
    2. For medical and industrial vision, added depth estimation, RGB-D segmentation, super-resolution and other reference models
  3. EoU enhancement: provided automated download scripts for free selection of the versions according to model name and hardware platform
  1. Support fast finetune in post-training quantization (PTQ);
  2. Improved quantize-aware training(QAT) functions:
  3. Support more layers: swish/sigmoid, hard-swish, hard-sigmoid, LeakyRelu, nested tf.keras functional and sequential models
  4. Support more layers:
    1. swish/sigmoid, hard-swish, hard-sigmoid, LeakyRelu
    2. Nested tf.keras functional and sequential models
  5. Support new models: EfficientNet, EfficientNetLite, Mobilenetv3, Yolov3 and Tiny Yolov3
  6. Support custom layers via subclassing tf.keras.layers and support custom quantization strategies
  7. Support custom layers and support custom quantization strategies
  8. Improved ease-of-use and bug fixed


  1. Support Pytorch 1.5-1.7.1
  2. Support activations
    1. hard-swish, hard-sigmoid
  3. Support more operators:  
    1. Const, Upsample, etc.
  4. Support shared parameters in quantization
  5. Enhanced quantization profiling and error check functions
  6. Improved QAT functions:
    1. support training from PTQ results
    2. support reused modules
    3. support resuming training
  1. Support tf.keras APIs in TF1
  2. Supports single GPU mode for model analysis 
  1. Improved easy-of-use with simplified APIs;
  2. Support torch.nn.ConvTranspose2d;
  3. Support reused modules;
  1. Support ALU for DPUCVDX8G (xvDPU)
  2. Support cross-layer prefetch optimization option
  3. Support xmodel output nodes assignment
  4. Enabled features to implement zero-copy for:
    1. DPUCZDX8G (DPUv2)
    2. DPUCAHX8H (DPUv3E)
    3. DPUCAHX8L (DPUv3ME)
  5. Open-sourced network visualization tool Netron officially supports Xilinx XIR 
  1. Support the 16 new models in AI Model Zoo:
    1. 11 new Pytorch models
    2. 5 new Tensorflow models, 1 from Tensorflow 2.x
    3. 1 new Caffe models
  2. Introduced new deploy APIs graph_runner, especially for models with multiple subgraphs
  3. Introduced new tool xdputil for DPU and xmodel debug
  4. Support new KV260 SoM kit
  5. Support DPUCVDX8G (xvDPU) on VCK190
  6. DPUCVDX8H (DPUv4E) on VCK5000
  1. Support Versal platforms VCK190 and VCK5000
  2. Support Petalinux 2021.1, OpenCV v4 
    1. EoU improved by updating the samples to use INT8 as input, reduced the conversion from FP32 to INT8;
  1. Support new DPU IPs:
    1. DPUCVDX8G (xvDPU)
    2. DPUCAHX8L (DPUv3ME)
    3. DPUCVDX8H (DPUv4E)
  2. Support DPUv2 & xvDPU in vivado flow
  3. Memory IO statistics
  4. EoUs improved 
  1. DPUv2 IP upgraded to 2021.1
  1. VCK190 xvDPU TRD
  2. Support batch size 1~6 which is configurable based on C32 mode
  3. PL support new OPs:
    1. Global Average Pooling up to 256x256, Element Multiply, Hardsigmoid and Hardswish
  4. More models deployed 
  1. Release xo in Vitis AI 1.4
  1. Support latest U250 platform (2020.2) 
  2. Support latest U200 platform (2021.1)
  3. Bug fixed
  1. Improved the DPU performance of small networks processing with weight pre-fetch function
  1. Multi Object Tracking (SORT) example on ZCU102 provided
  2. Classification App example for Versal (VCK190) provided
  3. Updated existing examples to XRT APIs and zero copy
  4. U200 (DPUv3INT8) TRD provided
  5. Ported U200/250 examples to use DPUv3INT8 instead of DPUv1
  6. Example for xRNN pre-processing acceleration (embedding layer)
  7. SSD MobileNet U280 example now accelerates both pre and post-processing on hardware
  1. Support of all DPUs - ZCU102/4, U50, U200, U250, U280
  2. Using Petalinux for edge devices
  3. Increased throughput using AKS at the application level
  4. Yolov3 tutorial as python notebook
  1. Unified DPU kernels into one and added samples for Alveo U200/250 (DPUv3INT8), U280, U50, U50lv