# canonical_formulation_nf_E1_B

Block-sparse tensor operand converted from the TIDES `cutensor_data` dataset.

## Provenance

This tensor is operand **B** (index labels `fag`) of a DMRG
tensor-network contraction generated with ITensor and exported through cuTENSOR.

- Einsum (this contraction): `dea,fag->defg`
- Companion operand in the original contraction: **A**
- Symmetry sectors (`group = nf`): combinations of Ky, Sz, Nf, and Nf-parity
  quantum numbers. More sectors => more, smaller blocks.
- Source repository: https://github.com/kmp5VT/BlockSparseGPUTests

## Tensor

- Order: 3
- Dimensions: [4, 1599, 1599]
- Block grid (partitions per mode): [3, 9, 9]
- Non-zero blocks: 25
- Non-zero elements (sum of non-zero block volumes): 1849041

## Values

Values are **not** stored (`values_provided: false`). Each non-zero block is dense;
users may fill values under the metadata constraints (`value_type: float64`,
`value_domain: general`). Block coordinates are 0-based and kept in their original
order from the source `.bs` file.
