# Tensora
A fast and easy-to-use dense/sparse tensor library for Python. Evaluate arbitrary tensor expressions with tensors in a variety of sparsity formats.
Tensors are n-dimensional generalizations of matrices. Instead of being confined to 1 or 2 dimensions, tensors may have 3, 4, or more dimensions. They are useful in a variety of applications. NumPy is the best known tensor library in Python; its central `ndarray` object is an example of a dense tensor.
In a dense tensor, each element is explicitly stored in memory. If the vast majority of elements are zero, then this is an inefficient layout, taking far more memory to store and far more time to operate on. There are many different sparse tensor formats, each one better or worse depending on which elements of the tensor are nonzero.
Many tensor kernels (functions that perform a specific algebraic calculation between tensors with specific sparse formats) have been written to solve specific problems. Recently, the [Tensor Algebra Compiler](http://tensor-compiler.org/) (TACO) was invented to automate the construction and optimization of tensor kernels for arbitrary algebraic expressions for arbitrary sparse formats. TACO takes an algebraic expression and description of the format of each tensor in the expression and returns a C function that efficiently evaluates the given expression for those tensor arguments.
Tensora is a Python wrapper around two tensor algebra compilers: the original TACO library and an independent Python implementation in Tensora. Tensora has a central class `Tensor` that simply has a pointer to a taco tensor held in C memory, managed by the `cffi` package. Tensora exposes functions that take a string of an algebraic expression and return a Python function the performs that operation in fast C code. In order to do that, the string is parsed and passed to the tensor algebra compiler; the C code generated by the tensor algebra compiler is compiled "on the fly" by `cffi` and then wrapped by code that provides good error handling.
Tensora comes with a command line tool `tensora`, which provides the C code to the user for given algebraic expressions and tensor formats.
## Getting started
Tensora can be installed with `pip` from PyPI:
```bash
pip install tensora
```
The class `Tensor` and the function `evaluate` together provide the porcelain interface for Tensora.
Here is an example of multiplying a sparse matrix in CSR format with a dense vector:
```python
from tensora import Tensor, evaluate
elements = {
(1,0): 2.0,
(0,1): -2.0,
(1,2): 4.0,
}
A = Tensor.from_dok(elements, dimensions=(2,3), format='ds')
x = Tensor.from_lol([0, -1, 2])
y = evaluate('y(i) = A(i,j) * x(j)', 'd', A=A, x=x)
assert y == Tensor.from_lol([2,8])
```
## Creating `Tensor`s
Creating a `Tensor` is best done via the `Tensor.from_*` methods. These methods convert a variety of data types into a `Tensor`. Most of the conversion methods optionally take both `dimensions` and `format` to determine the dimensions and format of the resulting tensor.
### `from_lol`: list of lists
```python
Tensor.from_lol(lol, *,
dimensions: tuple[int, ...] = None, format: Format | str = None)
```
Convert a dense list of lists to a `Tensor`.
* `lol` is a list of lists, possibly deeply nested. That is, `lol` is a `float`, a `list[float]`, a `list[list[float]]`, etc. to an arbitrary depth of `list`s. The values are read in row-major format, meaning the top-level list is the first dimension and the deepest list (the one containing actual scalars) is the last dimension. All lists at the same level must have the same length. For those familiar, this is identical to the NumPy behavior when constructing an array from lists of lists via `numpy.array`.
* `dimensions` has a default value that is inferred from the structure of `lol`. If provided, it must be consistent with the structure of `lol`. Providing the dimensions is typically only useful when one or more non-final dimensions may have size zero. For example, `Tensor.from_lol([[], []])` has dimensions of `(2,0)`, while `Tensor.from_lol([[], []], dimensions=(2,0,3))` has dimensions of `(2,0,3)`.
* `format` has a default value of all dense dimensions.
### `from_dok`: dictionary of keys
```python
Tensor.from_dok(dok: dict[tuple[int, ...], float], *,
dimensions: tuple[int, ...] = None, format: Format | str = None)
```
Convert a dictionary of keys to a `Tensor`.
* `dok` is a Python dictionary where each key is the coordinate of one non-zero value and the value of the entry is the value of the tensor at that coordinate. All coordinates not mentioned are implicitly zero.
* `dimensions` has a default value that is the largest size in each dimension found among the coordinates.
* `format` has a default value of dense dimensions as long as the number of nonzeros is larger than the product of those dimensions and then sparse dimensions after that. The default value is subject to change with experience.
### `from_aos`: array of structs
```python
Tensor.from_aos(aos: Iterable[tuple[int, ...]], values: Iterable[float], *,
dimensions: tuple[int, ...] = None, format: Format | str = None)
```
Convert a list of coordinates and a corresponding list of values to a `Tensor`.
* `aos` is an iterable of the coordinates of the non-zero values.
* `values` must be the same length as `aos` and each value is the non-zero value at the corresponding coordinate.
* `dimensions` has the same default as `Tensor.from_dok`, the largest size in each dimension.
* `format`has the same default as `Tensor.from_dok`, dense for an many dimensions as needed to fit the non-zeros.
### `from_soa`: struct of arrays
```python
Tensor.from_soa(soa: tuple[Iterable[int], ...], values: Iterable[float], *,
dimensions: tuple[int, ...] = None, format: Format | str = None)
```
Convert lists of indexes for each dimension and a corresponding list of values to a `Tensor`.
* `soa` is a tuple of iterables, where each iterable is all the indexes of the corresponding dimension. All iterables must be the same length.
* `values` must be the same length as the iterables in coordinates and each value is the non-zero value at the corresponding coordinate.
* `dimensions` has the same default as `Tensor.from_dok`, the largest size in each dimension.
* `format` has the same default as `Tensor.from_dok`, dense for an many dimensions as needed to fit the non-zeros.
### `from_numpy`: convert a NumPy array
```python
Tensor.from_numpy(array: numpy.ndarray, *,
format: Format | str = None)
```
Convert a NumPy array to a `Tensor`.
* `array` is any `NumPy.ndarray`. The resulting `Tensor` will have the same order, dimensions, and values of this array.
* `format` has a default value of all dense dimensions.
### `from_scipy_sparse`: convert a SciPy sparse matrix
```python
Tensor.from_scipy_sparse(data: scipy.sparse.spmatrix, *,
format: Format | str = None)
```
Convert a SciPy sparse matrix to a `Tensor`.
* `matrix` is any `SciPy.sparse.spmatrix`. The resulting `Tensor` will have the same order, dimensions, and values of this matrix. The tensor will always have order 2.
* `format` has a default value of `ds` for `csr_matrix` and `d1s0` for `csc_matrix` and also `ds` for the other sparse matrix types, though that is subject to changes as Tensora adds new format mode types.
## Evaluating expressions
Tensora generates kernels for algebraic expressions of tensor kernels and wraps them in the `evaluate` function.
```python
evaluate(assignment: str, output_format: str, **inputs: Tensor)
```
* `assignment` is parsable as an algebraic tensor assignment.
* `output_format` is the desired format of the output tensor.
* `inputs` is all the inputs to the expression. There must be one named argument for each variable name in `assignment`. The dimensions of the tensors in `inputs` must be consistent with `assignment` and with each other.
There is also `evaluate_tensora` and `evaluate_taco` that have identical interfaces, but use different tensor algebra compilers. `evaluate` is an alias for the default, which is currently `evaluate_tensora`.
## Getting the C code
The `tensora` CLI tool emits the C code for a given algebraic expression, tensor formats, and kernel type. It can emit the C code it generates itself, or the C code generated by TACO. It comes installed with Tensora and can be run like:
```bash
tensora 'y(i) = A(i,j) * x(j)' -f A:ds -t compute -o kernel.c
```
Here is the output of `tensora --help` for reference:
```
Usage: tensora [OPTIONS] ASSIGNMENT
╭─ Arguments ──────────────────────────────────────────────────────────────────────────────╮
│ * assignment TEXT The assignment for which to generate code, e.g. y(i) = A(i,j) │
│ * x(j). │
│ [required] │
╰──────────────────────────────────────────────────────────────────────────────────────────╯
╭─ Options ────────────────────────────────────────────────────────────────────────────────╮
│ --format -f TEXT A tensor and its format │
│ separated by a colon, e.g. │
│ A:d1s0 for CSC matrix. │
│ Unmentioned tensors are be │
│ assumed to be all dense. │
│ --type -t [assemble|compute|evaluate] The type of kernel that will │
│ be generated. Can be │
│ mentioned multiple times. │
│ [default: compute] │
│ --compiler -c [tensora|taco] The tensor algebra compiler │
│ to use to generate the │
│ kernel. │
│ [default: tensora] │
│ --output -o PATH The file to which the kernel │
│ will be written. If not │
│ specified, prints to standard │
│ out. │
│ [default: None] │
│ --install-completion [bash|zsh|fish|powershell|p Install completion for the │
│ wsh] specified shell. │
│ [default: None] │
│ --show-completion [bash|zsh|fish|powershell|p Show completion for the │
│ wsh] specified shell, to copy it │
│ or customize the │
│ installation. │
│ [default: None] │
│ --help Show this message and exit. │
╰──────────────────────────────────────────────────────────────────────────────────────────╯
```
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"description": "# Tensora\n\nA fast and easy-to-use dense/sparse tensor library for Python. Evaluate arbitrary tensor expressions with tensors in a variety of sparsity formats.\n\nTensors are n-dimensional generalizations of matrices. Instead of being confined to 1 or 2 dimensions, tensors may have 3, 4, or more dimensions. They are useful in a variety of applications. NumPy is the best known tensor library in Python; its central `ndarray` object is an example of a dense tensor. \n\nIn a dense tensor, each element is explicitly stored in memory. If the vast majority of elements are zero, then this is an inefficient layout, taking far more memory to store and far more time to operate on. There are many different sparse tensor formats, each one better or worse depending on which elements of the tensor are nonzero.\n\nMany tensor kernels (functions that perform a specific algebraic calculation between tensors with specific sparse formats) have been written to solve specific problems. Recently, the [Tensor Algebra Compiler](http://tensor-compiler.org/) (TACO) was invented to automate the construction and optimization of tensor kernels for arbitrary algebraic expressions for arbitrary sparse formats. TACO takes an algebraic expression and description of the format of each tensor in the expression and returns a C function that efficiently evaluates the given expression for those tensor arguments.\n\nTensora is a Python wrapper around two tensor algebra compilers: the original TACO library and an independent Python implementation in Tensora. Tensora has a central class `Tensor` that simply has a pointer to a taco tensor held in C memory, managed by the `cffi` package. Tensora exposes functions that take a string of an algebraic expression and return a Python function the performs that operation in fast C code. In order to do that, the string is parsed and passed to the tensor algebra compiler; the C code generated by the tensor algebra compiler is compiled \"on the fly\" by `cffi` and then wrapped by code that provides good error handling.\n\nTensora comes with a command line tool `tensora`, which provides the C code to the user for given algebraic expressions and tensor formats.\n\n\n## Getting started\n\nTensora can be installed with `pip` from PyPI:\n \n```bash\npip install tensora\n```\n\nThe class `Tensor` and the function `evaluate` together provide the porcelain interface for Tensora.\n\nHere is an example of multiplying a sparse matrix in CSR format with a dense vector:\n\n```python\nfrom tensora import Tensor, evaluate\n\nelements = {\n (1,0): 2.0,\n (0,1): -2.0,\n (1,2): 4.0, \n}\n\nA = Tensor.from_dok(elements, dimensions=(2,3), format='ds')\nx = Tensor.from_lol([0, -1, 2])\n\ny = evaluate('y(i) = A(i,j) * x(j)', 'd', A=A, x=x)\n\nassert y == Tensor.from_lol([2,8])\n``` \n\n\n## Creating `Tensor`s\n\nCreating a `Tensor` is best done via the `Tensor.from_*` methods. These methods convert a variety of data types into a `Tensor`. Most of the conversion methods optionally take both `dimensions` and `format` to determine the dimensions and format of the resulting tensor. \n\n### `from_lol`: list of lists\n\n```python\nTensor.from_lol(lol, *, \n dimensions: tuple[int, ...] = None, format: Format | str = None)\n```\n\nConvert a dense list of lists to a `Tensor`.\n\n* `lol` is a list of lists, possibly deeply nested. That is, `lol` is a `float`, a `list[float]`, a `list[list[float]]`, etc. to an arbitrary depth of `list`s. The values are read in row-major format, meaning the top-level list is the first dimension and the deepest list (the one containing actual scalars) is the last dimension. All lists at the same level must have the same length. For those familiar, this is identical to the NumPy behavior when constructing an array from lists of lists via `numpy.array`.\n\n* `dimensions` has a default value that is inferred from the structure of `lol`. If provided, it must be consistent with the structure of `lol`. Providing the dimensions is typically only useful when one or more non-final dimensions may have size zero. For example, `Tensor.from_lol([[], []])` has dimensions of `(2,0)`, while `Tensor.from_lol([[], []], dimensions=(2,0,3))` has dimensions of `(2,0,3)`.\n\n* `format` has a default value of all dense dimensions.\n\n### `from_dok`: dictionary of keys\n\n```python\nTensor.from_dok(dok: dict[tuple[int, ...], float], *, \n dimensions: tuple[int, ...] = None, format: Format | str = None)\n```\n\nConvert a dictionary of keys to a `Tensor`.\n\n* `dok` is a Python dictionary where each key is the coordinate of one non-zero value and the value of the entry is the value of the tensor at that coordinate. All coordinates not mentioned are implicitly zero.\n\n* `dimensions` has a default value that is the largest size in each dimension found among the coordinates.\n\n* `format` has a default value of dense dimensions as long as the number of nonzeros is larger than the product of those dimensions and then sparse dimensions after that. The default value is subject to change with experience.\n\n### `from_aos`: array of structs\n\n```python\nTensor.from_aos(aos: Iterable[tuple[int, ...]], values: Iterable[float], *, \n dimensions: tuple[int, ...] = None, format: Format | str = None)\n```\n\nConvert a list of coordinates and a corresponding list of values to a `Tensor`.\n\n* `aos` is an iterable of the coordinates of the non-zero values.\n\n* `values` must be the same length as `aos` and each value is the non-zero value at the corresponding coordinate.\n\n* `dimensions` has the same default as `Tensor.from_dok`, the largest size in each dimension.\n\n* `format`has the same default as `Tensor.from_dok`, dense for an many dimensions as needed to fit the non-zeros.\n\n### `from_soa`: struct of arrays\n\n```python\nTensor.from_soa(soa: tuple[Iterable[int], ...], values: Iterable[float], *, \n dimensions: tuple[int, ...] = None, format: Format | str = None)\n```\n\nConvert lists of indexes for each dimension and a corresponding list of values to a `Tensor`.\n\n* `soa` is a tuple of iterables, where each iterable is all the indexes of the corresponding dimension. All iterables must be the same length.\n\n* `values` must be the same length as the iterables in coordinates and each value is the non-zero value at the corresponding coordinate.\n\n* `dimensions` has the same default as `Tensor.from_dok`, the largest size in each dimension.\n\n* `format` has the same default as `Tensor.from_dok`, dense for an many dimensions as needed to fit the non-zeros.\n\n### `from_numpy`: convert a NumPy array\n\n```python\nTensor.from_numpy(array: numpy.ndarray, *, \n format: Format | str = None)\n```\n\nConvert a NumPy array to a `Tensor`.\n\n* `array` is any `NumPy.ndarray`. The resulting `Tensor` will have the same order, dimensions, and values of this array. \n\n* `format` has a default value of all dense dimensions.\n\n### `from_scipy_sparse`: convert a SciPy sparse matrix\n\n```python\nTensor.from_scipy_sparse(data: scipy.sparse.spmatrix, *, \n format: Format | str = None)\n```\n\nConvert a SciPy sparse matrix to a `Tensor`.\n\n* `matrix` is any `SciPy.sparse.spmatrix`. The resulting `Tensor` will have the same order, dimensions, and values of this matrix. The tensor will always have order 2.\n\n* `format` has a default value of `ds` for `csr_matrix` and `d1s0` for `csc_matrix` and also `ds` for the other sparse matrix types, though that is subject to changes as Tensora adds new format mode types.\n\n\n## Evaluating expressions\n\nTensora generates kernels for algebraic expressions of tensor kernels and wraps them in the `evaluate` function.\n\n```python\nevaluate(assignment: str, output_format: str, **inputs: Tensor)\n``` \n\n* `assignment` is parsable as an algebraic tensor assignment.\n\n* `output_format` is the desired format of the output tensor.\n\n* `inputs` is all the inputs to the expression. There must be one named argument for each variable name in `assignment`. The dimensions of the tensors in `inputs` must be consistent with `assignment` and with each other.\n\nThere is also `evaluate_tensora` and `evaluate_taco` that have identical interfaces, but use different tensor algebra compilers. `evaluate` is an alias for the default, which is currently `evaluate_tensora`.\n\n\n## Getting the C code\n\nThe `tensora` CLI tool emits the C code for a given algebraic expression, tensor formats, and kernel type. It can emit the C code it generates itself, or the C code generated by TACO. 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Can be \u2502\n\u2502 mentioned multiple times. \u2502\n\u2502 [default: compute] \u2502\n\u2502 --compiler -c [tensora|taco] The tensor algebra compiler \u2502\n\u2502 to use to generate the \u2502\n\u2502 kernel. \u2502\n\u2502 [default: tensora] \u2502\n\u2502 --output -o PATH The file to which the kernel \u2502\n\u2502 will be written. If not \u2502\n\u2502 specified, prints to standard \u2502\n\u2502 out. \u2502\n\u2502 [default: None] \u2502\n\u2502 --install-completion [bash|zsh|fish|powershell|p Install completion for the \u2502\n\u2502 wsh] specified shell. \u2502\n\u2502 [default: None] \u2502\n\u2502 --show-completion [bash|zsh|fish|powershell|p Show completion for the \u2502\n\u2502 wsh] specified shell, to copy it \u2502\n\u2502 or customize the \u2502\n\u2502 installation. \u2502\n\u2502 [default: None] \u2502\n\u2502 --help Show this message and exit. \u2502\n\u2570\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u256f\n```\n",
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