Enum Error 

pub enum Error {
    ShapeMismatch {
        expected: Shape,
        got: Shape,
    },
    RankMismatch {
        expected: usize,
        got: usize,
    },
    DTypeMismatch {
        expected: DType,
        got: DType,
    },
    DimOutOfRange {
        dim: usize,
        rank: usize,
    },
    NarrowOutOfBounds {
        dim: usize,
        start: usize,
        len: usize,
        dim_size: usize,
    },
    NotAScalar {
        shape: Shape,
    },
    ElementCountMismatch {
        shape: Shape,
        expected: usize,
        got: usize,
    },
    MatmulShapeMismatch {
        m: usize,
        k1: usize,
        k2: usize,
        n: usize,
    },
    ReshapeElementMismatch {
        src: usize,
        dst: usize,
        dst_shape: Shape,
    },
    Msg(String),
}

All errors that can occur within Shrew.

This enum captures every failure mode: shape mismatches, dtype mismatches, device mismatches, out-of-bounds indexing, and backend-specific errors. Using a single error type across the library simplifies error propagation.

Variants

ShapeMismatch

Shape mismatch between two tensors (e.g., trying to add [2,3] + [4,5]).

Fields

expected: Shape

got: Shape

RankMismatch

Operation requires a specific rank (number of dimensions).

Fields

expected: usize

got: usize

DTypeMismatch

DType mismatch between tensors in a binary operation.

Fields

expected: DType

got: DType

DimOutOfRange

Dimension index out of range for the tensor’s rank.

Fields

dim: usize

rank: usize

NarrowOutOfBounds

Narrow/slice operation out of bounds.

Fields

dim: usize

start: usize

len: usize

dim_size: usize

NotAScalar

Tried to access a scalar from a non-scalar tensor.

Fields

shape: Shape

ElementCountMismatch

Element count mismatch when creating from a vec.

Fields

shape: Shape

expected: usize

got: usize

MatmulShapeMismatch

Matrix multiplication dimension mismatch.

Fields

m: usize

k1: usize

k2: usize

n: usize

ReshapeElementMismatch

Cannot reshape because element counts differ.

Fields

src: usize

dst: usize

dst_shape: Shape

Msg(String)

Generic message for cases not covered above.

Implementations

impl Error

pub fn msg(s: impl Into<String>) -> Self

Create an error from any string message.

Trait Implementations

impl Debug for Error

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for Error

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for Error

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.