tract_core/ops/array/
range.rs

1use crate::ops::cast::Cast;
2use tract_num_traits::AsPrimitive;
3use tract_num_traits::Zero;
4
5use crate::internal::*;
6
7use super::Slice;
8
9#[derive(Debug, Default, Clone, new, Hash, PartialEq, Eq)]
10pub struct Range {
11    len: TDim,
12}
13
14impl Op for Range {
15    fn name(&self) -> StaticName {
16        "Range".into()
17    }
18
19    op_as_typed_op!();
20}
21
22impl EvalOp for Range {
23    fn is_stateless(&self) -> bool {
24        true
25    }
26
27    fn eval_with_session(
28        &self,
29        _node_id: usize,
30        session: &TurnState,
31        inputs: TVec<TValue>,
32    ) -> TractResult<TVec<TValue>> {
33        let (start, end, step) = args_3!(inputs);
34        Ok(tvec!(self.make(&start, &end, &step, &session.resolved_symbols)?.into_tvalue()))
35    }
36}
37
38impl Range {
39    fn make_t<T: Datum + for<'a> std::ops::Add<&'a T, Output = T>>(
40        start: &Tensor,
41        step: &Tensor,
42        len: usize,
43    ) -> TractResult<Tensor> {
44        unsafe {
45            let mut result = Tensor::uninitialized::<T>(&[len])?;
46            let mut v = start.try_as_plain()?.to_scalar::<T>()?.clone();
47            let step = step.try_as_plain()?.to_scalar::<T>()?;
48            {
49                let mut result_plain = result.try_as_plain_mut()?;
50                for i in 0..len {
51                    result_plain.as_slice_mut_unchecked::<T>()[i] = v.clone();
52                    v = v + step;
53                }
54            }
55            Ok(result)
56        }
57    }
58
59    fn make(
60        &self,
61        start: &Tensor,
62        end: &Tensor,
63        step: &Tensor,
64        values: &SymbolValues,
65    ) -> TractResult<Tensor> {
66        if start.datum_type() == TDim::datum_type() {
67            let start = start.try_as_plain()?.to_scalar::<TDim>()?.eval(values).to_i64()?;
68            let step = step.try_as_plain()?.to_scalar::<TDim>()?.eval(values).to_i64()?;
69            let len = {
70                let end = end.try_as_plain()?.to_scalar::<TDim>()?.eval(values).to_i64()?;
71                #[allow(clippy::cast_abs_to_unsigned)]
72                ((end - start).abs() as usize).divceil(step.abs() as usize)
73            };
74            Self::make_t::<i64>(&tensor0(start), &tensor0(step), len)
75        } else {
76            let len = dispatch_numbers!(Self::len_for_numbers(start.datum_type())(
77                self, start, end, step
78            ))?;
79            dispatch_numbers!(Self::make_t(start.datum_type())(start, step, len))
80        }
81    }
82
83    fn len_for_numbers<T: Datum + AsPrimitive<f64>>(
84        &self,
85        start: &Tensor,
86        end: &Tensor,
87        step: &Tensor,
88    ) -> TractResult<usize> {
89        let start = start.try_as_plain()?.to_scalar::<T>()?;
90        let end = end.try_as_plain()?.to_scalar::<T>()?;
91        let step = step.try_as_plain()?.to_scalar::<T>()?;
92        Ok(((end.as_() - start.as_()) / (step.as_())).ceil() as usize)
93    }
94}
95
96impl TypedOp for Range {
97    fn declutter(
98        &self,
99        model: &TypedModel,
100        node: &TypedNode,
101    ) -> TractResult<Option<TypedModelPatch>> {
102        rule_if_some!(succ = model.single_succ(node.id)?);
103        rule_if_some!(slice = succ.op_as::<Slice>());
104        rule_if!(slice.start.is_zero());
105        rule_if!(slice.end.is_zero());
106
107        let mut patch = TypedModelPatch::default();
108        let mut wire = patch.tap_model(model, node.inputs[0])?;
109        if model.outlet_fact(node.inputs[0])?.datum_type.is_tdim() {
110            wire = patch.wire_node(
111                format!("{}.cast-tdim", node.name),
112                Cast { to: DatumType::I64 },
113                &[wire],
114            )?[0];
115        }
116        let wire = patch.wire_node(&node.name, AxisOp::Add(0), &[wire])?;
117        patch.shunt_outside(model, succ.id.into(), wire[0])?;
118        Ok(Some(patch))
119    }
120
121    fn output_facts(&self, inputs: &[&TypedFact]) -> TractResult<TVec<TypedFact>> {
122        let [start, end, step] = inputs else {
123            bail!("Expects three inputs");
124        };
125        ensure!(start.datum_type() == end.datum_type());
126        ensure!(start.datum_type() == step.datum_type());
127        ensure!(start.shape.volume().is_one());
128        ensure!(end.shape.volume().is_one());
129        ensure!(step.shape.volume().is_one());
130        if let (Some(start), Some(end), Some(step)) = (&start.konst, &end.konst, &step.konst) {
131            if start.datum_type() == TDim::datum_type() {
132                let start_tdim = start.try_as_plain()?.to_scalar::<TDim>()?.clone();
133                let end_tdim = end.try_as_plain()?.to_scalar::<TDim>()?;
134                let step = step.cast_to_scalar::<i64>()?;
135                let len = if step < 0 {
136                    (start_tdim.clone() - end_tdim).divceil(-step as usize)
137                } else {
138                    (end_tdim.clone() - start_tdim.clone()).divceil(step as usize)
139                };
140                let mut fact = DatumType::I64.fact([len]);
141                if let Some(scope) = start_tdim.find_scope().or_else(|| end_tdim.find_scope()) {
142                    let x0 = TDim::Sym(scope.coord_sym(0));
143                    let term = if step == 1 { x0 } else { TDim::MulInt(step, Box::new(x0)) };
144                    fact.uniform_tdim = Some((start_tdim + term).reduce());
145                }
146                Ok(tvec!(fact))
147            } else {
148                let len = dispatch_numbers!(Self::len_for_numbers(start.datum_type())(
149                    self, start, end, step
150                ))?
151                .to_dim();
152                Ok(tvec!(start.datum_type().fact([len])))
153            }
154        } else {
155            let mut fact = start.datum_type.fact(std::slice::from_ref(&self.len));
156            if let (Some(s), Some(k)) = (&start.uniform_tdim, &step.uniform_tdim) {
157                if let Some(scope) = self.len.find_scope() {
158                    let x0 = TDim::Sym(scope.coord_sym(0));
159                    let term = match k {
160                        TDim::Val(1) => x0,
161                        TDim::Val(v) => TDim::MulInt(*v, Box::new(x0)),
162                        other => TDim::Mul(vec![other.clone(), x0]),
163                    };
164                    fact.uniform_tdim = Some((s.clone() + term).reduce());
165                }
166            }
167            Ok(tvec!(fact))
168        }
169    }
170
171    as_op!();
172}
tract_core/ops/array/range.rs

tract_core/ops/array/
range.rs
