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...ing-inference/inference-devices-and-modes/npu-device/batching-on-npu-plugin.rst
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NPU Plugin Batching | ||
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.. meta:: | ||
:description: OpenVINO™ NPU plugin supports batching | ||
either by executing concurrent inferences or by | ||
relying on native compiler support for batching. | ||
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OpenVINO™ NPU plugin supports batching either by executing concurrent inferences or by relying on native compiler support for batching. | ||
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First, the NPU plugin checks if the following conditions are met: | ||
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* The batch size is on the first axis. | ||
* All inputs and outputs have the same batch size. | ||
* The model does not contain states. | ||
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**If the conditions are met**, the NPU plugin attempts to compile and execute the original model with batch_size forced to 1. This approach is due to current compiler limitations and ongoing work to improve performance for batch_size greater than one. | ||
If the compilation is successful, the plugin detects a difference in batch size between the original model layout (with a batch size set to N) | ||
and the transformed/compiled layout (with a batch size set to 1). Then it executes the following steps: | ||
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1. Internally constructs multiple command lists, one for each input. | ||
2. Executes each command list for the proper offsets of input/output buffers. | ||
3. Notifies the user of the completion of the inference request after all command lists have been executed. | ||
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This concurrency-based batching mode is transparent to the application. A single inference request handles all inputs from the batch. | ||
While performance may be lower compared to regular batching (based on native compiler support), this mode provides basic batching functionality for use either with older drivers | ||
or when the model cannot yet be compiled with a batch size larger than one. | ||
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**If the conditions are not met**, the NPU plugin tries to compile and execute the original model with the given | ||
batch_size to N as any other regular model. | ||
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.. note:: | ||
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With future performance improvements and support for compiling multiple models with a batch size larger | ||
than one, the default order will change. NPU will try first to compile and execute the original model with the | ||
given batch size and fall back to concurrent batching if compilation fails. |
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