nvidia.dali.fn

The following table lists all operations available in nvidia.dali.fn module:

Function	Device support	Short description
audio_decoder	CPU	Legacy alias for decoders.audio().
audio_resample	CPU, GPU	Resamples an audio signal.
batch_permutation	CPU	Produces a batch of random integers which can be used as indices for indexing samples in the batch.
bb_flip	CPU, GPU	Flips bounding boxes horizontally or vertically (mirror).
bbox_paste	CPU	Transforms bounding boxes so that the boxes remain in the same place in the image after the image is pasted on a larger canvas.
bbox_rotate	CPU	Transforms bounding boxes so that the boxes remain in the same place in the image after the image is rotated. Boxes that land outside the image with keep_size=True will be removed from the output if the fraction of the remaining box after cropping is less than remove_threshold. If labels are passed as a second argument, they will also be removed synchronously.
box_encoder	CPU, GPU	Encodes the input bounding boxes and labels using a set of default boxes (anchors) passed as an argument.
brightness	CPU, GPU	Adjusts the brightness of the images.
brightness_contrast	CPU, GPU	Adjusts the brightness and contrast of the images.
caffe2_reader	CPU	Legacy alias for readers.caffe2().
caffe_reader	CPU	Legacy alias for readers.caffe().
cast	CPU, GPU	Cast a tensor to a different type.
cast_like	CPU, GPU	Cast the first tensor to the type of the second tensor.
cat	CPU, GPU	Joins the input tensors along an existing axis.
clahe	CPU, GPU	Contrast Limited Adaptive Histogram Equalization (CLAHE) operator. Performs local histogram equalization with clipping and bilinear blending of lookup tables (LUTs) between neighboring tiles. This technique enhances local contrast while preventing over-amplification of noise. Attempts to use same algorithm as OpenCV (https://docs.opencv.org/4.x/d5/daf/tutorial_py_histogram_equalization.html). The input image is divided into rectangular tiles, and histogram equalization is applied to each tile independently. To avoid artifacts at tile boundaries, the lookup tables are bilinearly interpolated between neighboring tiles. Supports both grayscale (1-channel) and RGB (3-channel) uint8 images in HWC layout.
coco_reader	CPU	Legacy alias for readers.coco().
coin_flip	CPU, GPU	Generates random boolean values following a bernoulli distribution.
color_space_conversion	CPU, GPU	Converts between various image color models.
color_twist	CPU, GPU	Adjusts hue, saturation, brightness and contrast of the image.
contrast	CPU, GPU	Adjusts the contrast of the images.
coord_flip	CPU, GPU	Transforms vectors or points by flipping (reflecting) their coordinates with respect to a given center.
coord_transform	CPU, GPU	Applies a linear transformation to points or vectors.
copy	CPU, GPU	Creates a copy of the input tensor.
crop	CPU, GPU	Crops the images with the specified window dimensions and window position (upper left corner).
crop_mirror_normalize	CPU, GPU	Performs fused cropping, normalization, format conversion (NHWC to NCHW) if desired, and type casting.
dl_tensor_python_function	CPU, GPU	Executes a Python function that operates on DLPack tensors.
dump_image	CPU, GPU	Save images in batch to disk in PPM format.
element_extract	CPU, GPU	Extracts one or more elements from input sequence.
erase	CPU, GPU	Erases one or more regions from the input tensors.
expand_dims	CPU, GPU	Insert new dimension(s) with extent 1 to the data shape.
external_source	CPU, GPU	Allows externally provided data to be passed as an input to the pipeline.
fast_resize_crop_mirror	CPU, GPU	Legacy alias for ResizedCropMirror, with antialiasing disabled by default.
file_reader	CPU	Legacy alias for readers.file().
flip	CPU, GPU	Flips the images in selected dimensions (horizontal, vertical, and depthwise).
full	CPU	Returns new data of given shape and type, filled with a fill value.
full_like	CPU	Returns new data with the same shape and type as the input data, filled with a fill_value.
gaussian_blur	CPU, GPU	Applies a Gaussian Blur to the input.
get_property	CPU, GPU	Returns a property of the tensor passed as an input.
grid_mask	CPU, GPU	Performs the gridmask augmentation (https://arxiv.org/abs/2001.04086).
hsv	CPU, GPU	Adjusts hue, saturation and value (brightness) of the images.
hue	CPU, GPU	Changes the hue level of the image.
image_decoder	CPU, Mixed	Legacy alias for decoders.image().
image_decoder_crop	CPU, Mixed	Legacy alias for decoders.image_crop().
image_decoder_random_crop	CPU, Mixed	Legacy alias for decoders.image_random_crop().
image_decoder_slice	CPU, Mixed	Legacy alias for decoders.image_slice().
jitter	GPU	Performs a random Jitter augmentation.
jpeg_compression_distortion	CPU, GPU	Introduces JPEG compression artifacts to RGB images.
laplacian	CPU, GPU	Computes the Laplacian of an input.
lookup_table	CPU, GPU	Maps the input to output by using a lookup table that is specified by keys and values, and a default_value for unspecified keys.
mel_filter_bank	CPU, GPU	Converts a spectrogram to a mel spectrogram by applying a bank of triangular filters.
mfcc	CPU, GPU	Computes Mel Frequency Cepstral Coefficients (MFCC) from a mel spectrogram.
multi_paste	CPU, GPU	Performs multiple pastes from image batch to each of the outputs.
mxnet_reader	CPU	Legacy alias for readers.mxnet().
nemo_asr_reader	CPU	Legacy alias for readers.nemo_asr().
nonsilent_region	CPU, GPU	Performs leading and trailing silence detection in an audio buffer.
normal_distribution	CPU, GPU	Generates random numbers following a normal distribution.
normalize	CPU, GPU	Normalizes the input by removing the mean and dividing by the standard deviation.
numba_function	CPU, GPU	Invokes a njit compiled Numba function.
numpy_reader	CPU, GPU	Legacy alias for readers.numpy().
one_hot	CPU, GPU	Produces a one-hot encoding of the input.
ones	CPU	Returns new data of given shape and type, filled with ones.
ones_like	CPU	Returns new data with the same shape and type as the input array, filled with ones.
optical_flow	GPU	Calculates the optical flow between images in the input.
pad	CPU, GPU	Pads all samples with the fill_value in the specified axes to match the biggest extent in the batch for those axes or to match the minimum shape specified.
paste	CPU, GPU	Pastes the input images on a larger canvas, where the canvas size is equal to input size * ratio. Only uint8 images of up to 1024 channels are supported.
peek_image_shape	CPU	Obtains the shape of the encoded image.
per_frame	CPU, GPU	Marks the input tensor as a sequence.
permute_batch	CPU, GPU	Returns a batch of tensors constructed by selecting tensors from the input based on indices given in indices argument.
power_spectrum	CPU	Calculates power spectrum of the signal.
preemphasis_filter	CPU, GPU	Applies preemphasis filter to the input data.
python_function	CPU, GPU	Executes a Python function.
random_bbox_crop	CPU	Applies a prospective random crop to an image coordinate space while keeping the bounding boxes, and optionally labels, consistent.
random_crop_generator	CPU	Produces a cropping window with a randomly selected area and aspect ratio.
random_resized_crop	CPU, GPU	Performs a crop with a randomly selected area and aspect ratio and resizes it to the specified size.
reinterpret	CPU, GPU	Treats content of the input as if it had a different type, shape, and/or layout.
reshape	CPU, GPU	Treats content of the input as if it had a different shape and/or layout.
resize	CPU, GPU	Resize images.
resize_crop_mirror	CPU, GPU	Performs a fused resize, crop, mirror operation.
roi_random_crop	CPU	Produces a fixed shape cropping window, randomly placed so that as much of the provided region of interest (ROI) is contained in it.
rotate	CPU, GPU	Rotates the images by the specified angle.
saturation	CPU, GPU	Changes the saturation level of the image.
sequence_reader	CPU	Legacy alias for readers.sequence().
sequence_rearrange	CPU, GPU	Rearranges frames in a sequence.
shapes	CPU, GPU	Returns the shapes of tensors in the input batch.
slice	CPU, GPU	Extracts a subtensor, or slice.
spectrogram	CPU, GPU	Produces a spectrogram from a 1D signal (for example, audio).
sphere	CPU, GPU	Performs a sphere augmentation.
squeeze	CPU, GPU	Removes the dimensions given as axes or axis_names.
ssd_random_crop	CPU	Performs a random crop with bounding boxes where Intersection Over Union (IoU) meets a randomly selected threshold between 0-1.
stack	CPU, GPU	Joins the input tensors along a new axis.
tfrecord_reader	CPU	Legacy alias for readers.tfrecord().
to_decibels	CPU, GPU	Converts a magnitude (real, positive) to the decibel scale.
torch_python_function	CPU, GPU	Executes a function that is operating on Torch tensors.
transpose	CPU, GPU	Transposes the tensors by reordering the dimensions based on the perm parameter.
uniform	CPU, GPU	Generates random numbers following a uniform distribution.
video_reader	GPU	Legacy alias for readers.video().
video_reader_resize	GPU	Legacy alias for readers.video_resize().
warp_affine	CPU, GPU	Applies an affine transformation to the images.
water	CPU, GPU	Performs a water augmentation, which makes the image appear to be underwater.
zeros	CPU	Returns new data of given shape and type, filled with zeros.
zeros_like	CPU	Returns new data with the same shape and type as the input array, filled with zeros.