Avoid slow matrix manipulation in QuantumBase.to_sympy

src/qiskit_symb/quantum_info/quantumbase.py

@@ -2,7 +2,6 @@
 
 import sympy
 from sympy import lambdify, Symbol
-from sympy.core.rules import Transform
 from sympy.matrices import matrix2numpy
 from qiskit import QuantumCircuit
 
@@ -63,13 +62,7 @@ def from_circuit(cls, circuit):
 
  def to_sympy(self):
  """todo"""
- # pylint: disable=unnecessary-lambda
- sympy_matrix = self._data
- sympy_matrix = sympy_matrix.xreplace(
- Transform(lambda x: x.round(3), lambda x: x.is_Float))
- sympy_matrix = sympy_matrix.xreplace(
- Transform(lambda x: int(x), lambda x: x.is_Float and x == int(x)))
- return sympy_matrix
+ return self._data
 
  def to_numpy(self):
  """todo"""