Change 1r-14 to 5e-14 in the following two examples. This is likely
required because expm() in scipy was rewritten in C.

Example 1:

  File "src/sage/matrix/matrix_double_dense.pyx", line 3666, in
  sage.matrix.matrix_double_dense.Matrix_double_dense.exp
  Failed example:
    A.exp()  # tol 1e-14
  Expected:
    [51.968956198705044  74.73656456700327]
    [112.10484685050491 164.07380304920997]
  Got:
    [51.968956198707595    74.736564567007]
    [112.10484685051048 164.07380304921807]
  Tolerance exceeded in 4 of 4:
    51.968956198705044 vs 51.968956198707595, tolerance 5e-14 > 1e-14
    74.73656456700327 vs 74.736564567007, tolerance 5e-14 > 1e-14
    112.10484685050491 vs 112.10484685051048, tolerance 5e-14 > 1e-14
    164.07380304920997 vs 164.07380304921807, tolerance 5e-14 > 1e-14

Example 2:

  File "src/sage/matrix/matrix_double_dense.pyx", line 3679, in
  sage.matrix.matrix_double_dense.Matrix_double_dense.exp
  Failed example:
    A.exp()   # tol 1e-14
  Expected:
    [51.968956198705044  74.73656456700327]
    [112.10484685050491 164.07380304920997]
Got:
    [51.968956198707595    74.736564567007]
    [112.10484685051048 164.07380304921807]
  Tolerance exceeded in 4 of 4:
    51.968956198705044 vs 51.968956198707595, tolerance 5e-14 > 1e-14
    74.73656456700327 vs 74.736564567007, tolerance 5e-14 > 1e-14
    112.10484685050491 vs 112.10484685051048, tolerance 5e-14 > 1e-14
    164.07380304920997 vs 164.07380304921807, tolerance 5e-14 > 1e-14

Change 1e-14 to 6e-14 in the following example. This is likely
necessary because expm() in scipy was rewritten in C.

  File "src/sage/matrix/matrix2.pyx", line 15903,
  in sage.matrix.matrix2.Matrix.exp
  Failed example:
    a.change_ring(RDF).exp()  # rel tol 1e-14
  Expected:
    [42748127.31532951 7368259.244159399]
    [234538976.1381042 40426191.45156228]
  Got:
    [ 42748127.31533201  7368259.244159831]
    [234538976.13811788  40426191.45156465]
  Tolerance exceeded in 4 of 4:
    42748127.31532951 vs 42748127.31533201, tolerance 6e-14 > 1e-14
    7368259.244159399 vs 7368259.244159831, tolerance 6e-14 > 1e-14
    234538976.1381042 vs 234538976.13811788, tolerance 6e-14 > 1e-14
    40426191.45156228 vs 40426191.45156465, tolerance 6e-14 > 1e-14

In the following example, we now use 5e-14 instead of 1e-14. This is
likely due to scipy's expm() being rewritten in C:

  File "src/sage/symbolic/constants_c_impl.pxi", line 162, in
  sage.symbolic.constants_c_impl.pxi.E.__pow__
  Failed example:
    e^A  # rel tol 1e-14
  Expected:
    [51.968956198705044  74.73656456700327]
    [112.10484685050491 164.07380304920997]
  Got:
    [51.968956198707595    74.736564567007]
    [112.10484685051048 164.07380304921807]
 Tolerance exceeded in 4 of 4:
    51.968956198705044 vs 51.968956198707595, tolerance 5e-14 > 1e-14
    74.73656456700327 vs 74.736564567007, tolerance 5e-14 > 1e-14
    112.10484685050491 vs 112.10484685051048, tolerance 5e-14 > 1e-14
    164.07380304920997 vs 164.07380304921807, tolerance 5e-14 > 1e-14