aclFormat

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typedef enum {
    ACL_FORMAT_UNDEFINED = -1,
    ACL_FORMAT_NCHW = 0,
    ACL_FORMAT_NHWC = 1,
    ACL_FORMAT_ND = 2,
    ACL_FORMAT_NC1HWC0 = 3,
    ACL_FORMAT_FRACTAL_Z = 4,
    ACL_FORMAT_NC1HWC0_C04 = 12,
    ACL_FORMAT_HWCN = 16,
    ACL_FORMAT_NDHWC = 27,
    ACL_FORMAT_FRACTAL_NZ = 29,
    ACL_FORMAT_NCDHW = 30,
    ACL_FORMAT_NDC1HWC0 = 32,
    ACL_FRACTAL_Z_3D = 33,
    ACL_FORMAT_NC = 35,
    ACL_FORMAT_NCL = 47,
    ACL_FORMAT_FRACTAL_NZ_C0_16 = 50,
    ACL_FORMAT_FRACTAL_NZ_C0_32 = 51,
    ACL_FORMAT_FRACTAL_NZ_C0_2 = 52, 
    ACL_FORMAT_FRACTAL_NZ_C0_4 = 53, 
    ACL_FORMAT_FRACTAL_NZ_C0_8 = 54, 
} aclFormat;

The available dimensions of a feature image are the batch size (N), height (H), width (W), channels (C), depth (D), and length (L).

The fields for aclFormat are described as follows:

• UNDEFINED (default): unknown format.
• NCHW: a 4D format.
• NHWC: a 4D format.
• ND: any format, applicable to operators that take singular inputs, such as Square and Tanh. Exercise caution when using other operators.
• NC1HWC0: a 5D format. C0 is closely related to the micro-architecture, and the value is equal to the Cube Unit size, for example, 16. C1 is obtained by dividing the C dimension by C0, that is, C1 = C/C0. When the division is not exact, the last data segment is padded to C0.
• FRACTAL_Z: a format of the convolution weight.
• NC1HWC0_C04: a 5D data format. C0 has a fixed value of 4 while C1 = C/C0. When C is not exactly divisible by C0, the last data segment is padded to C0. It is not supported by the current version.
• HWCN: a 4D format.
• NDHWC: The depth (D) dimension is required for 3D images.
• FRACTAL_NZ: an internal format for fractals. It is not required currently.
• NCDHW: The depth (D) dimension is required for 3D images.
• NDC1HWC0: a 6D data format. It has an additional depth (D) dimension compared with NC1HWC0.
• FRACTAL_Z_3D: a 3D convolution weight format, which is required by operators such as Conv3D, MaxPool3D, and AvgPool3D.
• NC: a 2D format.
• NCL: a 3D format.
• FRACTAL_NZ_C0_[M]: a special internal data layout format for fractals, where [M] indicates the value of C0. Currently, the value can be 2, 4, 8, 16, or 32. It is not required currently.

  Only the Atlas 350 Accelerator Card supports this type.