Temporary fixes to support pytorch backend migration

[MatteoRobbiati]

This is needed to complete the Pytorch backend migration from Qibo to Qiboml.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.59%. Comparing base (50a13e2) to head (cb66755). Report is 4 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/qiboteam/qiboml/pull/45?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) ```diff @@ Coverage Diff @@ ## main #45 +/- ## ======================================= Coverage 66.59% 66.59% ======================================= Files 11 11 Lines 488 488 ======================================= Hits 325 325 Misses 163 163 ``` | [Flag](https://app.codecov.io/gh/qiboteam/qiboml/pull/45/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/qiboteam/qiboml/pull/45/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | `66.59% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files with missing lines](https://app.codecov.io/gh/qiboteam/qiboml/pull/45?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam) | Coverage Δ | | |---|---|---| | [src/qiboml/backends/\_\_init\_\_.py](https://app.codecov.io/gh/qiboteam/qiboml/pull/45?src=pr&el=tree&filepath=src%2Fqiboml%2Fbackends%2F__init__.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=qiboteam#diff-c3JjL3FpYm9tbC9iYWNrZW5kcy9fX2luaXRfXy5weQ==) | `100.00% <ø> (ø)` | |

[BrunoLiegiBastonLiegi]

Are these just the recent modifications added in qiboteam/qibo#1450 ?

[MatteoRobbiati]

Are these just the recent modifications added in qiboteam/qibo#1450 ?

Required for the backend migration.