1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

use crate::dim::DimLike;
use crate::model::TVec;
use std::fmt;

#[derive(Copy, Clone, Debug, PartialEq)]
pub enum DataFormat {
    NCHW,
    NHWC,
}

impl Default for DataFormat {
    fn default() -> DataFormat {
        DataFormat::NCHW
    }
}

impl DataFormat {
    pub fn shape<D, S>(&self, shape: S) -> BaseDataShape<D, S>
    where
        D: DimLike,
        S: AsRef<[D]> + fmt::Debug,
    {
        let mut strides: TVec<D> = tvec![1.into()];
        for dim in shape.as_ref().iter().skip(1).rev() {
            let previous = strides.last().unwrap().clone();
            strides.push(previous * dim);
        }
        strides.reverse();
        BaseDataShape { fmt: *self, shape, strides }
    }

    pub fn from_n_c_hw<D, S>(&self, n: D, c: D, shape: S) -> BaseDataShape<D, TVec<D>>
    where
        D: DimLike,
        S: AsRef<[D]> + fmt::Debug,
    {
        let mut me = tvec!(n.clone());
        if *self == DataFormat::NCHW {
            me.push(c.clone());
        }
        me.extend(shape.as_ref().iter().cloned());
        if *self == DataFormat::NHWC {
            me.push(c.clone());
        }
        self.shape(me)
    }
}

pub type DataShape = BaseDataShape<usize, TVec<usize>>;

#[derive(Clone, Debug, PartialEq)]
pub struct BaseDataShape<D, S>
where
    D: DimLike,
    S: AsRef<[D]> + fmt::Debug,
{
    pub fmt: DataFormat,
    pub shape: S,
    pub strides: TVec<D>,
}

impl<D, S> BaseDataShape<D, S>
where
    D: DimLike,
    S: AsRef<[D]> + fmt::Debug,
{
    pub fn rank(&self) -> usize {
        self.shape.as_ref().len()
    }

    pub fn hw_rank(&self) -> usize {
        self.shape.as_ref().len() - 2
    }

    pub fn n_axis(&self) -> usize {
        0
    }

    pub fn c_axis(&self) -> usize {
        match self.fmt {
            DataFormat::NHWC => self.shape.as_ref().len() - 1,
            DataFormat::NCHW => 1,
        }
    }

    pub fn h_axis(&self) -> usize {
        match self.fmt {
            DataFormat::NHWC => 1,
            DataFormat::NCHW => 2,
        }
    }

    pub fn hw_axes(&self) -> ::std::ops::Range<usize> {
        self.h_axis()..self.h_axis() + self.hw_rank()
    }

    pub fn n_dim(&self) -> &D {
        unsafe { self.shape.as_ref().get_unchecked(self.n_axis()) }
    }

    pub fn c_dim(&self) -> &D {
        unsafe { self.shape.as_ref().get_unchecked(self.c_axis()) }
    }

    pub fn hw_dims(&self) -> &[D] {
        unsafe { self.shape.as_ref().get_unchecked(self.hw_axes()) }
    }

    pub fn n(&self) -> &D {
        unsafe { self.shape.as_ref().get_unchecked(self.n_axis()) }
    }

    pub fn c(&self) -> &D {
        unsafe { self.shape.as_ref().get_unchecked(self.c_axis()) }
    }

    pub fn n_stride(&self) -> &D {
        unsafe { self.strides.get_unchecked(self.n_axis()) }
    }

    pub fn hw_strides(&self) -> &[D] {
        unsafe { self.strides.as_ref().get_unchecked(self.hw_axes()) }
    }

    pub fn w_stride(&self) -> &D {
        unsafe { self.hw_strides().get_unchecked(self.hw_rank() - 1) }
    }

    pub fn c_stride(&self) -> &D {
        unsafe { self.strides.get_unchecked(self.c_axis()) }
    }
}