# NNData This message carries tensors and its data. [NeuralNetwork](https://docs.luxonis.com/software/depthai-components/nodes/neural_network.md) node outputs NNData. ## Creating NNData You can also create this message on the host ([example here](https://github.com/luxonis/oak-examples/blob/cd4a1e2be64a7c0319870cf80b4be3bd0561e9a0/gen2-efficientnet-classification/main.py#L125-L127)) or [Script](https://docs.luxonis.com/software/depthai-components/nodes/script.md) node ([Script NNData example](https://docs.luxonis.com/software/depthai/examples/script_nndata_example.md)), populate the tensor with the data, and send the message to the input of the [NeuralNetwork](https://docs.luxonis.com/software/depthai-components/nodes/neural_network.md) node. ## Reference ### depthai.NNData(depthai.Buffer) Kind: Class NNData message. Carries tensors and their metadata #### __init__(self) Kind: Method Construct NNData message. #### getAllLayerNames(self) -> list[str]: list[str] Kind: Method Returns: Names of all layers added #### getAllLayers(self) -> list[TensorInfo]: list[TensorInfo] Kind: Method Returns: All layers and their information #### getFirstLayerFp16(self) -> list[float]: list[float] Kind: Method Convenience function to retrieve float values from first layers FP16 tensor Returns: Float data #### getFirstLayerInt32(self) -> list[int]: list[int] Kind: Method Convenience function to retrieve INT32 values from first layers tensor Returns: INT32 data #### getFirstLayerUInt8(self) -> list[int]: list[int] Kind: Method Convenience function to retrieve U8 data from first layer Returns: U8 binary data #### getLayer(self, name: str, tensor: TensorInfo) -> bool: bool Kind: Method Retrieve layers tensor information Parameter ``name``: Name of the layer Parameter ``tensor``: Outputs tensor information of that layer Returns: True if layer exists, false otherwise #### getLayerDatatype(self, name: str, datatype: TensorInfo.DataType) -> bool: bool Kind: Method Retrieve datatype of a layers tensor Parameter ``name``: Name of the layer Parameter ``datatype``: Datatype of layers tensor Returns: True if layer exists, false otherwise #### getLayerFp16(self, name: str) -> list[float]: list[float] Kind: Method Convenience function to retrieve float values from layers FP16 tensor Parameter ``name``: Name of the layer Returns: Float data #### getLayerInt32(self, name: str) -> list[int]: list[int] Kind: Method Convenience function to retrieve INT32 values from layers tensor Parameter ``name``: Name of the layer Returns: INT32 data #### getLayerUInt8(self, name: str) -> list[int]: list[int] Kind: Method Convenience function to retrieve U8 data from layer Parameter ``name``: Name of the layer Returns: U8 binary data #### getSequenceNum(self) -> int: int Kind: Method Retrieves sequence number #### getTimestamp(self) -> datetime.timedelta: datetime.timedelta Kind: Method Retrieves timestamp related to dai::Clock::now() #### getTimestampDevice(self) -> datetime.timedelta: datetime.timedelta Kind: Method Retrieves timestamp directly captured from device's monotonic clock, not synchronized to host time. Used mostly for debugging #### hasLayer(self, name: str) -> bool: bool Kind: Method Checks if given layer exists Parameter ``name``: Name of the layer Returns: True if layer exists, false otherwise #### setLayer() Kind: Method #### setSequenceNum(self, arg0: typing.SupportsInt) -> NNData: NNData Kind: Method Retrieves image sequence number #### setTimestamp(self, arg0: datetime.timedelta) -> NNData: NNData Kind: Method Sets image timestamp related to dai::Clock::now() #### setTimestampDevice(self, arg0: datetime.timedelta) -> NNData: NNData Kind: Method Sets image timestamp related to dai::Clock::now() ### Need assistance? Head over to [Discussion Forum](https://discuss.luxonis.com/) for technical support or any other questions you might have.