SymbolicHamiltonian refactor

pyproject.toml

@@ -56,7 +56,7 @@ ipython = "^8.10.0"
 qulacs = { version = "^0.6.4", markers = "(sys_platform == 'darwin' and python_version > '3.9') or sys_platform != 'darwin'" }
 seaborn = "^0.13.2"
 ipykernel = "^6.29.4"
-qibojit = { git = "https://github.com/qiboteam/qibojit.git"}
+qibojit = { git = "https://github.com/qiboteam/qibojit.git", branch = "cupy_identity_matrix"}
 
 [tool.poetry.group.tests]
 optional = true
@@ -70,7 +70,7 @@ pytest-cov = "^4.0.0"
 pylint = "3.1.0"
 matplotlib = "^3.7.0"
 torch = "^2.1.1,<2.4"
-qibojit = { git = "https://github.com/qiboteam/qibojit.git"}
+qibojit = { git = "https://github.com/qiboteam/qibojit.git", branch = "cupy_identity_matrix"}
 qibotn = { git = "https://github.com/qiboteam/qibotn.git" }
 qiboml = { git  = "https://github.com/qiboteam/qiboml.git" }
 stim = "^1.12.0"
@@ -91,7 +91,7 @@ optional = true
 [tool.poetry.group.cuda11.dependencies]
 cupy-cuda11x = "^13.1.0"
 cuquantum-python-cu11 = "^23.3.0"
-qibojit = { git = "https://github.com/qiboteam/qibojit.git" }
+qibojit = { git = "https://github.com/qiboteam/qibojit.git", branch = "cupy_identity_matrix" }
 qibotn = { git = "https://github.com/qiboteam/qibotn.git" }
 
 
@@ -101,7 +101,7 @@ optional = true
 [tool.poetry.group.cuda12.dependencies]
 cupy-cuda12x = "^13.1.0"
 cuquantum-python-cu12 = "^23.3.0"
-qibojit = { git = "https://github.com/qiboteam/qibojit.git"}
+qibojit = { git = "https://github.com/qiboteam/qibojit.git", branch = "cupy_identity_matrix"}
 qibotn = { git = "https://github.com/qiboteam/qibotn.git" }
 
 [tool.poetry.extras]

src/qibo/hamiltonians/__init__.py

@@ -1,6 +1,2 @@
-from qibo.hamiltonians.hamiltonians import (
-    Hamiltonian,
-    SymbolicHamiltonian,
-    TrotterHamiltonian,
-)
+from qibo.hamiltonians.hamiltonians import Hamiltonian, SymbolicHamiltonian
 from qibo.hamiltonians.models import TFIM, XXX, XXZ, Heisenberg, MaxCut, X, Y, Z