mirror of
https://github.com/blakeblackshear/frigate.git
synced 2024-11-21 19:07:46 +01:00
313 lines
11 KiB
Python
313 lines
11 KiB
Python
import logging
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import ctypes
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import numpy as np
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try:
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import tensorrt as trt
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from cuda import cuda
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TRT_SUPPORT = True
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except ModuleNotFoundError as e:
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TRT_SUPPORT = False
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from frigate.detectors.detection_api import DetectionApi
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from frigate.detectors.detector_config import BaseDetectorConfig
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from typing import Literal
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from pydantic import Field
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logger = logging.getLogger(__name__)
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DETECTOR_KEY = "tensorrt"
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if TRT_SUPPORT:
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class TrtLogger(trt.ILogger):
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def __init__(self):
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trt.ILogger.__init__(self)
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def log(self, severity, msg):
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logger.log(self.getSeverity(severity), msg)
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def getSeverity(self, sev: trt.ILogger.Severity) -> int:
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if sev == trt.ILogger.VERBOSE:
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return logging.DEBUG
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elif sev == trt.ILogger.INFO:
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return logging.INFO
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elif sev == trt.ILogger.WARNING:
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return logging.WARNING
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elif sev == trt.ILogger.ERROR:
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return logging.ERROR
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elif sev == trt.ILogger.INTERNAL_ERROR:
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return logging.CRITICAL
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else:
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return logging.DEBUG
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class TensorRTDetectorConfig(BaseDetectorConfig):
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type: Literal[DETECTOR_KEY]
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device: int = Field(default=0, title="GPU Device Index")
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class HostDeviceMem(object):
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"""Simple helper data class that's a little nicer to use than a 2-tuple."""
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def __init__(self, host_mem, device_mem, nbytes, size):
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self.host = host_mem
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err, self.host_dev = cuda.cuMemHostGetDevicePointer(self.host, 0)
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self.device = device_mem
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self.nbytes = nbytes
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self.size = size
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def __str__(self):
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return "Host:\n" + str(self.host) + "\nDevice:\n" + str(self.device)
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def __repr__(self):
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return self.__str__()
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def __del__(self):
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cuda.cuMemFreeHost(self.host)
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cuda.cuMemFree(self.device)
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class TensorRtDetector(DetectionApi):
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type_key = DETECTOR_KEY
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def _load_engine(self, model_path):
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try:
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trt.init_libnvinfer_plugins(self.trt_logger, "")
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ctypes.cdll.LoadLibrary("/trt-models/libyolo_layer.so")
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except OSError as e:
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logger.error(
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"ERROR: failed to load libraries. %s",
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e,
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)
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with open(model_path, "rb") as f, trt.Runtime(self.trt_logger) as runtime:
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return runtime.deserialize_cuda_engine(f.read())
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def _get_input_shape(self):
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"""Get input shape of the TensorRT YOLO engine."""
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binding = self.engine[0]
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assert self.engine.binding_is_input(binding)
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binding_dims = self.engine.get_binding_shape(binding)
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if len(binding_dims) == 4:
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return (
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tuple(binding_dims[2:]),
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trt.nptype(self.engine.get_binding_dtype(binding)),
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)
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elif len(binding_dims) == 3:
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return (
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tuple(binding_dims[1:]),
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trt.nptype(self.engine.get_binding_dtype(binding)),
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)
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else:
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raise ValueError(
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"bad dims of binding %s: %s" % (binding, str(binding_dims))
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)
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def _allocate_buffers(self):
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"""Allocates all host/device in/out buffers required for an engine."""
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inputs = []
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outputs = []
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bindings = []
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output_idx = 0
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for binding in self.engine:
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binding_dims = self.engine.get_binding_shape(binding)
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if len(binding_dims) == 4:
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# explicit batch case (TensorRT 7+)
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size = trt.volume(binding_dims)
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elif len(binding_dims) == 3:
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# implicit batch case (TensorRT 6 or older)
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size = trt.volume(binding_dims) * self.engine.max_batch_size
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else:
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raise ValueError(
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"bad dims of binding %s: %s" % (binding, str(binding_dims))
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)
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nbytes = size * self.engine.get_binding_dtype(binding).itemsize
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# Allocate host and device buffers
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err, host_mem = cuda.cuMemHostAlloc(
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nbytes, Flags=cuda.CU_MEMHOSTALLOC_DEVICEMAP
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)
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assert err is cuda.CUresult.CUDA_SUCCESS, f"cuMemAllocHost returned {err}"
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logger.debug(
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f"Allocated Tensor Binding {binding} Memory {nbytes} Bytes ({size} * {self.engine.get_binding_dtype(binding)})"
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)
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err, device_mem = cuda.cuMemAlloc(nbytes)
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assert err is cuda.CUresult.CUDA_SUCCESS, f"cuMemAlloc returned {err}"
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# Append the device buffer to device bindings.
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bindings.append(int(device_mem))
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# Append to the appropriate list.
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if self.engine.binding_is_input(binding):
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logger.debug(f"Input has Shape {binding_dims}")
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inputs.append(HostDeviceMem(host_mem, device_mem, nbytes, size))
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else:
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# each grid has 3 anchors, each anchor generates a detection
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# output of 7 float32 values
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assert size % 7 == 0, f"output size was {size}"
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logger.debug(f"Output has Shape {binding_dims}")
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outputs.append(HostDeviceMem(host_mem, device_mem, nbytes, size))
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output_idx += 1
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assert len(inputs) == 1, f"inputs len was {len(inputs)}"
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assert len(outputs) == 1, f"output len was {len(outputs)}"
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return inputs, outputs, bindings
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def _do_inference(self):
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"""do_inference (for TensorRT 7.0+)
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This function is generalized for multiple inputs/outputs for full
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dimension networks.
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Inputs and outputs are expected to be lists of HostDeviceMem objects.
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"""
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# Push CUDA Context
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cuda.cuCtxPushCurrent(self.cu_ctx)
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# Transfer input data to the GPU.
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[
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cuda.cuMemcpyHtoDAsync(inp.device, inp.host, inp.nbytes, self.stream)
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for inp in self.inputs
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]
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# Run inference.
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if not self.context.execute_async_v2(
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bindings=self.bindings, stream_handle=self.stream
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):
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logger.warn(f"Execute returned false")
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# Transfer predictions back from the GPU.
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[
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cuda.cuMemcpyDtoHAsync(out.host, out.device, out.nbytes, self.stream)
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for out in self.outputs
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]
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# Synchronize the stream
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cuda.cuStreamSynchronize(self.stream)
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# Pop CUDA Context
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cuda.cuCtxPopCurrent()
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# Return only the host outputs.
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return [
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np.array(
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(ctypes.c_float * out.size).from_address(out.host), dtype=np.float32
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)
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for out in self.outputs
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]
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def __init__(self, detector_config: TensorRTDetectorConfig):
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assert (
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TRT_SUPPORT
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), f"TensorRT libraries not found, {DETECTOR_KEY} detector not present"
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(cuda_err,) = cuda.cuInit(0)
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assert (
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cuda_err == cuda.CUresult.CUDA_SUCCESS
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), f"Failed to initialize cuda {cuda_err}"
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err, dev_count = cuda.cuDeviceGetCount()
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logger.debug(f"Num Available Devices: {dev_count}")
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assert (
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detector_config.device < dev_count
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), f"Invalid TensorRT Device Config. Device {detector_config.device} Invalid."
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err, self.cu_ctx = cuda.cuCtxCreate(
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cuda.CUctx_flags.CU_CTX_MAP_HOST, detector_config.device
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)
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self.conf_th = 0.4 ##TODO: model config parameter
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self.nms_threshold = 0.4
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err, self.stream = cuda.cuStreamCreate(0)
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self.trt_logger = TrtLogger()
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self.engine = self._load_engine(detector_config.model.path)
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self.input_shape = self._get_input_shape()
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try:
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self.context = self.engine.create_execution_context()
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(
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self.inputs,
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self.outputs,
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self.bindings,
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) = self._allocate_buffers()
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except Exception as e:
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logger.error(e)
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raise RuntimeError("fail to allocate CUDA resources") from e
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logger.debug("TensorRT loaded. Input shape is %s", self.input_shape)
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logger.debug("TensorRT version is %s", trt.__version__[0])
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def __del__(self):
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"""Free CUDA memories."""
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if self.outputs is not None:
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del self.outputs
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if self.inputs is not None:
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del self.inputs
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if self.stream is not None:
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cuda.cuStreamDestroy(self.stream)
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del self.stream
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del self.engine
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del self.context
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del self.trt_logger
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cuda.cuCtxDestroy(self.cu_ctx)
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def _postprocess_yolo(self, trt_outputs, conf_th):
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"""Postprocess TensorRT outputs.
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# Args
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trt_outputs: a list of 2 or 3 tensors, where each tensor
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contains a multiple of 7 float32 numbers in
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the order of [x, y, w, h, box_confidence, class_id, class_prob]
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conf_th: confidence threshold
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# Returns
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boxes, scores, classes
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"""
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# filter low-conf detections and concatenate results of all yolo layers
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detections = []
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for o in trt_outputs:
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dets = o.reshape((-1, 7))
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dets = dets[dets[:, 4] * dets[:, 6] >= conf_th]
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detections.append(dets)
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detections = np.concatenate(detections, axis=0)
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return detections
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def detect_raw(self, tensor_input):
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# Input tensor has the shape of the [height, width, 3]
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# Output tensor of float32 of shape [20, 6] where:
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# O - class id
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# 1 - score
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# 2..5 - a value between 0 and 1 of the box: [top, left, bottom, right]
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# normalize
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if self.input_shape[-1] != trt.int8:
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tensor_input = tensor_input.astype(self.input_shape[-1])
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tensor_input /= 255.0
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self.inputs[0].host = np.ascontiguousarray(
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tensor_input.astype(self.input_shape[-1])
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)
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trt_outputs = self._do_inference()
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raw_detections = self._postprocess_yolo(trt_outputs, self.conf_th)
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if len(raw_detections) == 0:
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return np.zeros((20, 6), np.float32)
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# raw_detections: Nx7 numpy arrays of
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# [[x, y, w, h, box_confidence, class_id, class_prob],
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# Calculate score as box_confidence x class_prob
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raw_detections[:, 4] = raw_detections[:, 4] * raw_detections[:, 6]
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# Reorder elements by the score, best on top, remove class_prob
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ordered = raw_detections[raw_detections[:, 4].argsort()[::-1]][:, 0:6]
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# transform width to right with clamp to 0..1
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ordered[:, 2] = np.clip(ordered[:, 2] + ordered[:, 0], 0, 1)
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# transform height to bottom with clamp to 0..1
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ordered[:, 3] = np.clip(ordered[:, 3] + ordered[:, 1], 0, 1)
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# put result into the correct order and limit to top 20
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detections = ordered[:, [5, 4, 1, 0, 3, 2]][:20]
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# pad to 20x6 shape
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append_cnt = 20 - len(detections)
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if append_cnt > 0:
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detections = np.append(
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detections, np.zeros((append_cnt, 6), np.float32), axis=0
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)
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return detections
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