import numpy as np
import pytest

import aesara.tensor as at
from aesara.compile import UnusedInputError
from aesara.compile.function import function, pfunc
from aesara.compile.function.pfunc import rebuild_collect_shared
from aesara.compile.io import In
from aesara.compile.sharedvalue import shared
from aesara.configdefaults import config
from aesara.graph.fg import MissingInputError
from aesara.misc.safe_asarray import _asarray
from aesara.tensor.math import sum as at_sum
from aesara.tensor.type import (
    bscalar,
    bvector,
    dmatrices,
    dmatrix,
    dscalar,
    dvector,
    fscalar,
    fvector,
    imatrix,
    iscalar,
    ivector,
    ivectors,
    lscalar,
    wvector,
)
from aesara.utils import PYTHON_INT_BITWIDTH


def data_of(s):
    # Return the raw value of a shared variable
    return s.container.storage[0]


class TestPfunc:
    def test_doc(self):
        # Ensure the code given in pfunc.txt works as expected

        # Example #1.
        a = lscalar()
        b = shared(1)
        f1 = pfunc([a], (a + b))
        f2 = pfunc([In(a, value=44)], a + b, updates={b: b + 1})
        assert b.get_value() == 1
        assert f1(3) == 4
        assert f2(3) == 4
        assert b.get_value() == 2
        assert f1(3) == 5
        b.set_value(0)
        assert f1(3) == 3

        # Example #2.
        a = lscalar()
        b = shared(7)
        f1 = pfunc([a], a + b)
        f2 = pfunc([a], a * b)
        assert f1(5) == 12
        b.set_value(8)
        assert f1(5) == 13
        assert f2(4) == 32

    def test_shared(self):

        # CHECK: two functions (f1 and f2) can share w
        w = shared(np.random.random((2, 2)), "w")
        wval = w.get_value(borrow=False)

        x = dmatrix()
        out1 = w + x
        out2 = w * x
        f1 = pfunc([x], [out1])
        f2 = pfunc([x], [out2])
        xval = np.random.random((2, 2))
        assert np.all(f1(xval) == xval + wval)
        assert np.all(f2(xval) == xval * wval)

        # CHECK: updating a shared value
        f3 = pfunc([x], out1, updates=[(w, (w - 1))])
        # f3 changes the value of w
        assert np.all(f3(xval) == xval + wval)
        # this same value is read by f1
        assert np.all(f1(xval) == xval + (wval - 1))

        w.set_value(w.get_value(borrow=True) * 10, borrow=True)
        # this same value is read by f1
        assert np.all(f1(xval) == xval + w.get_value(borrow=True))

    def test_no_shared_as_input(self):
        # Test that shared variables cannot be used as function inputs.
        w_init = np.random.random((2, 2))
        w = shared(w_init.copy(), "w")
        with pytest.raises(
            TypeError, match=r"^Cannot use a shared variable \(w\) as explicit input"
        ):
            pfunc([w], at_sum(w * w))

    def test_default_container(self):
        # Ensure it is possible to (implicitly) use a shared variable in a
        # function, as a 'state' that can be updated at will.

        rng = np.random.default_rng(1827)
        w_init = rng.random((5))
        w = shared(w_init.copy(), "w")
        reg = at_sum(w * w)
        f = pfunc([], reg)

        assert f() == np.sum(w_init * w_init)
        # Change the value of w and ensure the output changes accordingly.
        w.set_value(w.get_value(borrow=True) + 1.0, borrow=True)
        assert f() == np.sum((w_init + 1) ** 2)

    def test_default_scalar_container(self):
        # Similar in spirit to test_default_container, but updating a scalar
        # variable. This is a sanity check for non mutable types.
        x = shared(0.0, "x")
        f = pfunc([], x)
        assert f() == 0
        x.set_value(x.get_value(borrow=True) + 1, borrow=True)
        assert f() == 1

    def test_param_strict(self):

        a = dvector()
        b = shared(7)
        out = a + b

        f = pfunc([In(a, strict=False)], [out])
        # works, random( generates float64 by default
        f(np.random.random((8)))
        # works, casting is allowed
        f(np.array([1, 2, 3, 4], dtype="int32"))

        f = pfunc([In(a, strict=True)], [out])
        try:
            # fails, f expects float64
            f(np.array([1, 2, 3, 4], dtype="int32"))
        except TypeError:
            pass

    def test_param_mutable(self):
        a = dvector()
        a_out = a * 2  # assuming the op which makes this "in place" triggers

        # using mutable=True will let fip change the value in aval
        fip = pfunc([In(a, mutable=True)], [a_out], mode="FAST_RUN")
        aval = np.random.random((10))
        aval2 = aval.copy()
        assert np.all(fip(aval) == (aval2 * 2))
        assert not np.all(aval == aval2)

        # using mutable=False should leave the input untouched
        f = pfunc([In(a, mutable=False)], [a_out], mode="FAST_RUN")
        aval = np.random.random((10))
        aval2 = aval.copy()
        assert np.all(f(aval) == (aval2 * 2))
        assert np.all(aval == aval2)

    def test_shared_mutable(self):
        bval = np.arange(5)
        b = shared(bval)
        b_out = b * 2

        # shared vars copy args.
        assert b.get_value(borrow=True) is not bval
        # so we do this to get at the underlying data
        bval = data_of(b)

        # by default, shared are not mutable unless doing an explicit update
        f = pfunc([], [b_out], mode="FAST_RUN")
        assert (f() == np.arange(5) * 2).all()
        assert np.all(b.get_value(borrow=True) == np.arange(5))

        # using updates, b is now a mutable parameter
        f = pfunc([], [b_out], updates=[(b, b_out)], mode="FAST_RUN")
        assert (f() == (np.arange(5) * 2)).all()
        # because of the update
        assert (b.get_value(borrow=True) == (np.arange(5) * 2)).all()
        assert (bval == (np.arange(5) * 2)).all()  # because of mutable=True

        # do not depend on updates being in-place though!
        bval = np.arange(5)
        b.set_value(bval, borrow=True)
        bval = data_of(b)
        f = pfunc([], [b_out], updates=[(b, (b_out + 3))], mode="FAST_RUN")
        assert (f() == (np.arange(5) * 2)).all()
        # because of the update
        assert (b.get_value(borrow=True) == ((np.arange(5) * 2) + 3)).all()
        # bval got modified to something...
        assert not (bval == np.arange(5)).all()
        # ... but not to b.value !
        assert not (bval == b.get_value(borrow=True)).all()

    def test_param_allow_downcast_int(self):
        a = wvector("a")  # int16
        b = bvector("b")  # int8
        c = bscalar("c")  # int8
        f = pfunc(
            [
                In(a, allow_downcast=True),
                In(b, allow_downcast=False),
                In(c, allow_downcast=None),
            ],
            (a + b + c),
        )

        # Both values are in range. Since they're not ndarrays (but lists),
        # they will be converted, and their value checked.
        assert np.all(f([3], [6], 1) == 10)

        # Values are in range, but a dtype too large has explicitly been given
        # For performance reasons, no check of the data is explicitly performed
        # (It might be OK to change this in the future.)
        with pytest.raises(TypeError):
            f([3], np.array([6], dtype="int16"), 1)

        # Value too big for a, silently ignored
        assert np.all(f([2 ** 20], np.ones(1, dtype="int8"), 1) == 2)

        # Value too big for b, raises TypeError
        with pytest.raises(TypeError):
            f([3], [312], 1)

        # Value too big for c, raises TypeError
        with pytest.raises(TypeError):
            f([3], [6], 806)

    def test_param_allow_downcast_floatX(self):
        a = fscalar("a")
        b = fscalar("b")
        c = fscalar("c")

        f = pfunc(
            [
                In(a, allow_downcast=True),
                In(b, allow_downcast=False),
                In(c, allow_downcast=None),
            ],
            (a + b + c),
        )

        # If the values can be accurately represented, everything is OK
        assert np.all(f(0, 0, 0) == 0)

        # If allow_downcast is True, idem
        assert np.allclose(f(0.1, 0, 0), 0.1)

        # If allow_downcast is False, nope
        with pytest.raises(TypeError):
            f(0, 0.1, 0)

        # If allow_downcast is None, it should work iff floatX=float32
        if config.floatX == "float32":
            assert np.allclose(f(0, 0, 0.1), 0.1)
        else:
            with pytest.raises(TypeError):
                f(0, 0, 0.1)

    def test_param_allow_downcast_vector_floatX(self):
        a = fvector("a")
        b = fvector("b")
        c = fvector("c")

        f = pfunc(
            [
                In(a, allow_downcast=True),
                In(b, allow_downcast=False),
                In(c, allow_downcast=None),
            ],
            (a + b + c),
        )

        # If the values can be accurately represented, everything is OK
        z = [0]
        assert np.all(f(z, z, z) == 0)

        # If allow_downcast is True, idem
        assert np.allclose(f([0.1], z, z), 0.1)

        # If allow_downcast is False, nope
        with pytest.raises(TypeError):
            f(z, [0.1], z)

        # If allow_downcast is None, like False
        with pytest.raises(TypeError):
            f(z, z, [0.1])

    def test_allow_input_downcast_int(self):
        a = wvector("a")  # int16
        b = bvector("b")  # int8
        c = bscalar("c")  # int8

        f = pfunc([a, b, c], (a + b + c), allow_input_downcast=True)
        # Value too big for a, b, or c, silently ignored
        assert f([2 ** 20], [1], 0) == 1
        assert f([3], [312], 0) == 59
        assert f([3], [1], 806) == 42

        g = pfunc([a, b, c], (a + b + c), allow_input_downcast=False)
        # All values are in range. Since they're not ndarrays (but lists
        # or scalars), they will be converted, and their value checked.
        assert np.all(g([3], [6], 0) == 9)

        # Values are in range, but a dtype too large has explicitly been given
        # For performance reasons, no check of the data is explicitly performed
        # (It might be OK to change this in the future.)
        with pytest.raises(TypeError):
            g([3], np.array([6], dtype="int16"), 0)

        # Value too big for b, raises TypeError
        with pytest.raises(TypeError):
            g([3], [312], 0)

        h = pfunc([a, b, c], (a + b + c))  # Default: allow_input_downcast=None
        # Everything here should behave like with False
        assert np.all(h([3], [6], 0) == 9)
        with pytest.raises(TypeError):
            h([3], np.array([6], dtype="int16"), 0)
        with pytest.raises(TypeError):
            h([3], [312], 0)

    def test_allow_downcast_floatX(self):
        a = fscalar("a")
        b = fvector("b")

        f = pfunc([a, b], (a + b), allow_input_downcast=True)
        g = pfunc([a, b], (a + b), allow_input_downcast=False)
        h = pfunc([a, b], (a + b), allow_input_downcast=None)

        # If the values can be accurately represented, OK
        assert np.all(f(0, [0]) == 0)
        assert np.all(g(0, [0]) == 0)
        assert np.all(h(0, [0]) == 0)

        # For the vector: OK iff allow_input_downcast is True
        assert np.allclose(f(0, [0.1]), 0.1)
        with pytest.raises(TypeError):
            g(0, [0.1])
        with pytest.raises(TypeError):
            h(0, [0.1])

        # For the scalar: OK if allow_input_downcast is True,
        # or None and floatX==float32
        assert np.allclose(f(0.1, [0]), 0.1)
        with pytest.raises(TypeError):
            g(0.1, [0])
        if config.floatX == "float32":
            assert np.allclose(h(0.1, [0]), 0.1)
        else:
            with pytest.raises(TypeError):
                h(0.1, [0])

    def test_update(self):
        # Test update mechanism in different settings.

        # Simple value assignment.
        x = shared(0)
        assign = pfunc([], [], updates={x: 3})
        assign()
        assert x.get_value() == 3

        # Basic increment function.
        x.set_value(0)
        inc = pfunc([], [], updates={x: x + 1})
        inc()
        assert x.get_value() == 1

        # Increment by a constant value.
        x.set_value(-1)
        y = shared(2)
        inc_by_y = pfunc([], [], updates={x: x + y})
        inc_by_y()
        assert x.get_value() == 1

    def test_update_err_broadcast(self):
        # Test that broadcastable dimensions raise error
        data = np.random.random((10, 10)).astype("float32")
        output_var = shared(name="output", value=data)

        # the update_var has type matrix, and the update expression
        # is a broadcasted scalar, and that should be allowed.
        with pytest.raises(TypeError):
            function(
                inputs=[],
                outputs=[],
                updates={output_var: output_var.sum().dimshuffle("x", "x")},
            )

    def test_duplicate_updates(self):
        x, y = dmatrices("x", "y")
        z = shared(np.ones((2, 3)))
        with pytest.raises(ValueError):
            function([x, y], [z], updates=[(z, (z + x + y)), (z, (z - x))])

    def test_givens(self):
        x = shared(0)
        assign = pfunc([], x, givens={x: 3})
        assert assign() == 3
        assert x.get_value(borrow=True) == 0

        y = ivector()
        f = pfunc([y], (y * x), givens={x: 6})
        assert np.all(f([1, 1, 1]) == [6, 6, 6])
        assert x.get_value() == 0

        z = ivector()
        c = z * y
        f = pfunc([y], (c + 7), givens={z: _asarray([4, 4, 4], dtype="int32")})
        assert np.all(f([1, 1, 1]) == [11, 11, 11])
        assert x.get_value() == 0

    def test_clone0(self):
        x = shared(np.asarray([4, 4, 4]))
        y = shared(np.asarray([4, 4, 4]))
        z = shared(np.asarray([2, 2, 2]))
        up = pfunc(
            [], [], updates={x: (x * 5), y: ((x * 5) + y), z: (((x * 5) + y) ** z)}
        )

        up()
        assert np.all(x.get_value() == 20)
        assert np.all(y.get_value() == 24)
        assert np.all(z.get_value() == (24 ** 2))

    def test_default_updates(self):
        x = shared(0)
        x.default_update = x + 1

        f = pfunc([], [x])
        f()
        assert x.get_value() == 1

        del x.default_update
        f()
        assert x.get_value() == 2

        g = pfunc([], [x])
        g()
        assert x.get_value() == 2

    def test_no_default_updates(self):
        x = shared(0)
        y = shared(1)
        x.default_update = x + 2

        # Test that the default update is taken into account in the right cases
        f1 = pfunc([], [x], no_default_updates=True)
        f1()
        assert x.get_value() == 0

        f2 = pfunc([], [x], no_default_updates=[x])
        f2()
        assert x.get_value() == 0

        f3 = pfunc([], [x], no_default_updates=[x, y])
        f3()
        assert x.get_value() == 0

        f4 = pfunc([], [x], no_default_updates=[y])
        f4()
        assert x.get_value() == 2

        f5 = pfunc([], [x], no_default_updates=[])
        f5()
        assert x.get_value() == 4

        f5 = pfunc([], [x], no_default_updates=False)
        f5()
        assert x.get_value() == 6

        with pytest.raises(TypeError):
            pfunc([], [x], no_default_updates=(x))
        with pytest.raises(TypeError):
            pfunc([], [x], no_default_updates=x)
        with pytest.raises(TypeError):
            pfunc([], [x], no_default_updates="canard")

        # Mix explicit updates and no_default_updates
        g1 = pfunc([], [x], updates=[(x, (x - 1))], no_default_updates=True)
        g1()
        assert x.get_value() == 5

        g2 = pfunc([], [x], updates=[(x, (x - 1))], no_default_updates=[x])
        g2()
        assert x.get_value() == 4

        g3 = pfunc([], [x], updates=[(x, (x - 1))], no_default_updates=[x, y])
        g3()
        assert x.get_value() == 3

        g4 = pfunc([], [x], updates=[(x, (x - 1))], no_default_updates=[y])
        g4()
        assert x.get_value() == 2

        g5 = pfunc([], [x], updates=[(x, (x - 1))], no_default_updates=[])
        g5()
        assert x.get_value() == 1

        g5 = pfunc([], [x], updates=[(x, (x - 1))], no_default_updates=False)
        g5()
        assert x.get_value() == 0

    def test_default_updates_expressions(self):
        x = shared(0)
        y = shared(1)
        a = lscalar("a")

        z = a * x
        x.default_update = x + y

        f1 = pfunc([a], z)
        f1(12)
        assert x.get_value() == 1

        f2 = pfunc([a], z, no_default_updates=True)
        assert f2(7) == 7
        assert x.get_value() == 1

        f3 = pfunc([a], z, no_default_updates=[x])
        assert f3(9) == 9
        assert x.get_value() == 1

    def test_default_updates_multiple(self):
        x = shared(0)
        y = shared(1)

        x.default_update = x - 1
        y.default_update = y + 1

        f1 = pfunc([], [x, y])
        f1()
        assert x.get_value() == -1
        assert y.get_value() == 2

        f2 = pfunc([], [x, y], updates=[(x, (x - 2))], no_default_updates=[y])
        f2()
        assert x.get_value() == -3
        assert y.get_value() == 2

        f3 = pfunc([], [x, y], updates=[(x, (x - 2))], no_default_updates=True)
        f3()
        assert x.get_value() == -5
        assert y.get_value() == 2

        f4 = pfunc([], [x, y], updates=[(y, (y - 2))])
        f4()
        assert x.get_value() == -6
        assert y.get_value() == 0

    def test_default_updates_chained(self):
        x = shared(2)
        y = shared(1)
        z = shared(-1)

        x.default_update = x - y
        y.default_update = z
        z.default_update = z - 1

        f1 = pfunc([], [x])
        f1()
        assert x.get_value() == 1
        assert y.get_value() == -1
        assert z.get_value() == -2

        f2 = pfunc([], [x, y])
        f2()
        assert x.get_value() == 2
        assert y.get_value() == -2
        assert z.get_value() == -3

        f3 = pfunc([], [y])
        f3()
        assert x.get_value() == 2
        assert y.get_value() == -3
        assert z.get_value() == -4

        f4 = pfunc([], [x, y], no_default_updates=[x])
        f4()
        assert x.get_value() == 2
        assert y.get_value() == -4
        assert z.get_value() == -5

        f5 = pfunc([], [x, y, z], no_default_updates=[z])
        f5()
        assert x.get_value() == 6
        assert y.get_value() == -5
        assert z.get_value() == -5

    def test_default_updates_input(self):
        x = shared(0)
        y = shared(1)
        if PYTHON_INT_BITWIDTH == 32:
            a = iscalar("a")
        else:
            a = lscalar("a")

        x.default_update = y
        y.default_update = y + a

        f1 = pfunc([], x, no_default_updates=True)
        f1()
        assert x.get_value() == 0
        assert y.get_value() == 1

        f2 = pfunc([], x, no_default_updates=[x])
        f2()
        assert x.get_value() == 0
        assert y.get_value() == 1

        f3 = pfunc([], x, no_default_updates=[y])
        f3()
        assert x.get_value() == 1
        assert y.get_value() == 1

        f4 = pfunc([a], x)
        f4(2)
        assert x.get_value() == 1
        assert y.get_value() == 3

        f5 = pfunc([], x, updates={y: (y - 1)})
        f5()
        assert x.get_value() == 3
        assert y.get_value() == 2

        # a is needed as input if y.default_update is used
        with pytest.raises(MissingInputError):
            pfunc([], x)

    def test_default_updates_partial_graph(self):
        a = shared(0)
        a.default_update = a + 1  # Increment a each time it is used
        b = 2 * a
        # Use only the tip of the graph, a is not used
        f = pfunc([b], b)
        assert a.get_value() == 0
        f(21)
        assert a.get_value() == 0

    def test_givens_replaces_shared_variable(self):
        a = shared(1.0, "a")
        a.default_update = a + 3.0
        b = dscalar("b")
        c = a + 10
        f = pfunc([b], c, givens={a: b})

        assert len(f.maker.fgraph.inputs) == 1
        assert len(f.maker.fgraph.outputs) == 1

    def test_givens_replaces_shared_variable2(self):
        a = shared(1.0, "a")
        a.default_update = a + 3
        c = a + 10
        f = pfunc([], c, givens={a: (a + 10)})

        assert f() == 21
        assert f() == 34

    def test_duplicate_inputs(self):
        x = lscalar("x")
        with pytest.raises(UnusedInputError):
            function([x, x, x], x)

    def test_update_same(self):
        # There was a bug in CVM, triggered when a shared variable
        # was its own update expression.
        a = shared(1.0, "a")
        b = shared(np.ones((2, 3)), "b")

        # The order of the variables is not determined, so we try
        # both shared variables.
        # TODO: explain the above comment. By "not determined" does
        # this mean "not deterministic"?
        # This test originally wrote the updates using dictionaries,
        # and iterating over the dictionary was not deterministic.
        # Is that all the comment above meant, or is the CVM intended
        # to add extra non-determinism? Or is the CVM meant to
        # deterministically but arbitrarily pick an order for the updates?
        f = function([], [], updates=[(a, a), (b, (2 * b))])
        g = function([], [], updates=[(a, (a * 2)), (b, b)])

        f()
        assert a.get_value(borrow=True).shape == (), a.get_value()
        assert b.get_value(borrow=True).shape == (2, 3), b.get_value()
        g()
        assert a.get_value(borrow=True).shape == (), a.get_value()
        assert b.get_value(borrow=True).shape == (2, 3), b.get_value()

    def test_update_equiv(self):
        # Like test_update_same, but the update expression is simplified until
        # it is found to be equal to the original variable
        a = shared(1.0, "a")
        b = shared(np.ones((2, 3)), "b")

        # See comment in test_update_same about why we try both
        # shared variables.
        f = function([], [], updates=[(a, a), (b, (2 * b - b))])
        g = function([], [], updates=[(a, (a * 2 - a)), (b, b)])

        f()
        assert a.get_value(borrow=True).shape == (), a.get_value()
        assert b.get_value(borrow=True).shape == (2, 3), b.get_value()
        g()
        assert a.get_value(borrow=True).shape == (), a.get_value()
        assert b.get_value(borrow=True).shape == (2, 3), b.get_value()


class TestAliasingRules:
    # 1. Aesara manages its own memory space, which typically does not overlap
    # with the memory of normal python variables that the user uses.
    #
    # 2. shared variables are allocated in this memory space, as are the
    # temporaries used for Function evaluation.
    #
    # 3. Physically, this managed memory space may be spread across the host,
    # on a GPU device(s), or even on a remote machine.
    #
    # 4. Aesara assumes that shared variables are never aliased to one another,
    # and tries to make it impossible to accidentally alias them.
    #
    # 5. Aesara's managed data is constant while Aesara Functions are not running
    # and aesara library code is not running.
    #
    # 6. The default behaviour of Function is to return user-space values for
    # outputs, but this can be overridden (borrow=True) for better performance,
    # in which case the returned value may be aliased to managed memory, and
    # potentially invalidated by the next Aesara Function call or call to aesara
    # library code.

    def shared(self, x):
        return shared(x)

    def test_shared_constructor_copies(self):
        # shared constructor makes copy
        # (rule #2)
        orig_a = np.zeros((2, 2))
        A = self.shared(orig_a)
        assert not np.may_share_memory(orig_a, data_of(A))

        # rule #2 reading back from aesara-managed memory
        assert not np.may_share_memory(A.get_value(borrow=False), data_of(A))

    def test_sparse_input_aliasing_affecting_inplace_operations(self):
        sp = pytest.importorskip("scipy", minversion="0.7.0")

        from aesara import sparse

        # Note: to trigger this bug with aesara rev 4586:2bc6fc7f218b,
        #        you need to make in inputs mutable (so that inplace
        #        operations are used) and to break the elemwise composition
        #        with some non-elemwise op (here dot)

        x = sparse.SparseType("csc", dtype="float64")()
        y = sparse.SparseType("csc", dtype="float64")()
        f = function([In(x, mutable=True), In(y, mutable=True)], (x + y) + (x + y))
        # Test 1. If the same variable is given twice

        # Compute bogus values
        m = sp.sparse.csc_matrix(
            np.asarray(
                [
                    [1, 0, 0, 0, 0],
                    [0, 1, 0, 0, 0],
                    [0, 0, 1, 0, 0],
                    [0, 0, 0, 1, 0],
                    [0, 0, 0, 0, 1],
                ],
                dtype="float64",
            )
        )
        bogus_vals = f(m, m)
        # Since we used inplace operation v and m may be corrupted
        # so we need to recreate them

        m = sp.sparse.csc_matrix(
            np.asarray(
                [
                    [1, 0, 0, 0, 0],
                    [0, 1, 0, 0, 0],
                    [0, 0, 1, 0, 0],
                    [0, 0, 0, 1, 0],
                    [0, 0, 0, 0, 1],
                ],
                dtype="float64",
            )
        )
        m_copy = m.copy()
        vals = f(m, m_copy)

        assert np.allclose(vals.todense(), bogus_vals.todense())

    def test_input_aliasing_affecting_inplace_operations(self):

        # Note: to trigger this bug with aesara rev 4586:2bc6fc7f218b,
        #        you need to make in inputs mutable (so that inplace
        #        operations are used) and to break the elemwise composition
        #        with some non-elemwise op (here dot)
        x = dvector()
        y = dvector()
        m1 = dmatrix()
        m2 = dmatrix()
        f = function(
            [
                In(x, mutable=True),
                In(y, mutable=True),
                In(m1, mutable=True),
                In(m2, mutable=True),
            ],
            at.dot((x * 2), m1) + at.dot((y * 3), m2),
        )
        # Test 1. If the same variable is given twice

        # Compute bogus values
        v = np.asarray([1, 2, 3, 4, 5], dtype="float64")
        m = np.asarray(
            [
                [1, 0, 0, 0, 0],
                [0, 1, 0, 0, 0],
                [0, 0, 1, 0, 0],
                [0, 0, 0, 1, 0],
                [0, 0, 0, 0, 1],
            ],
            dtype="float64",
        )
        bogus_vals = f(v, v, m, m)
        # Since we used inplace operation v and m may be corrupted
        # so we need to recreate them

        v = np.asarray([1, 2, 3, 4, 5], dtype="float64")
        m = np.asarray(
            [
                [1, 0, 0, 0, 0],
                [0, 1, 0, 0, 0],
                [0, 0, 1, 0, 0],
                [0, 0, 0, 1, 0],
                [0, 0, 0, 0, 1],
            ],
            dtype="float64",
        )
        m_copy = m.copy()
        v_copy = v.copy()
        vals = f(v, v_copy, m, m_copy)

        assert np.allclose(vals, bogus_vals)

    def test_partial_input_aliasing_affecting_inplace_operations(self):

        # Note: to trigger this bug with aesara rev 4586:2bc6fc7f218b,
        #        you need to make in inputs mutable ( so that inplace
        #        operations are used) and to break the elemwise composition
        #        with some non-elemwise op ( here dot )
        x = dvector()
        y = dvector()
        z = dvector()
        m1 = dmatrix()
        m2 = dmatrix()
        m3 = dmatrix()

        # Test 2. If variables only partial overlap
        #   more exactly we care about the case when we have a,b,c
        #   and a shares memory with b, b shares memory with c, but
        #   c does not share memory with a

        f = function(
            [
                In(x, mutable=True),
                In(y, mutable=True),
                In(z, mutable=True),
                In(m1, mutable=True),
                In(m2, mutable=True),
                In(m3, mutable=True),
            ],
            (at.dot((x * 2), m1) + at.dot((y * 3), m2) + at.dot((z * 4), m3)),
        )

        # Compute bogus values
        v = np.asarray([1, 2, 3, 4, 5], dtype="float64")
        m = np.asarray([[1, 0], [0, 1]], dtype="float64")
        bogus_vals = f(v[:2], v[1:3], v[2:4], m, m, m)
        # Since we used inplace operation v and m may be corrupted
        # so we need to recreate them

        v = np.asarray([1, 2, 3, 4, 5], dtype="float64")
        m = np.asarray([[1, 0], [0, 1]], dtype="float64")
        m_copy1 = m.copy()
        v_copy1 = v.copy()
        m_copy2 = m.copy()
        v_copy2 = v.copy()
        vals = f(v[:2], v_copy1[1:3], v_copy2[2:4], m, m_copy1, m_copy2)

        assert np.allclose(vals, bogus_vals)

    def test_potential_output_aliasing_induced_by_updates(self):

        A = self.shared(np.zeros((2, 2)))
        B = self.shared(np.zeros((2, 2)))
        C = np.zeros((2, 2))
        D = dmatrix()
        DD = D + 5

        f = pfunc([D], [], updates=[(A, D), (B, D)])
        f(C)

        assert not np.may_share_memory(data_of(A), data_of(B))
        f = pfunc([D], [], updates=[(A, D[:]), (B, D)])
        f(C)
        assert not np.may_share_memory(data_of(A), data_of(B))
        f = pfunc([D], [], updates=[(A, (D + 5)), (B, D[:])])
        f(C)
        assert not np.may_share_memory(data_of(A), data_of(B))

        f = pfunc([D], [], updates=[(A, (D + 5)), (B, D)])
        f(C)
        assert not np.may_share_memory(data_of(A), data_of(B))

        f = pfunc([D], DD, updates=[(A, DD[:1]), (B, DD)])
        R = f(C)
        assert not np.may_share_memory(data_of(A), data_of(B))
        assert not np.may_share_memory(R, data_of(B))
        assert not np.may_share_memory(R, data_of(A))

        f = pfunc([D], DD, updates=[(A, DD[:1]), (B, (DD[:1] * 2))])
        R = f(C)
        assert not np.may_share_memory(data_of(A), data_of(B))
        assert not np.may_share_memory(R, data_of(B))
        assert not np.may_share_memory(R, data_of(A))

        f = pfunc([D], (DD * 4), updates=[(A, (DD[:1] * 3)), (B, (DD[:1] * 2))])
        R = f(C)
        assert not np.may_share_memory(data_of(A), data_of(B))
        assert not np.may_share_memory(R, data_of(B))
        assert not np.may_share_memory(R, data_of(A))

        f = pfunc([D], (DD * 4), updates=[(A, (DD[:1] * 3)), (B, (DD[:1] * 3))])
        R = f(C)
        assert not np.may_share_memory(data_of(A), data_of(B))
        assert not np.may_share_memory(R, data_of(B))
        assert not np.may_share_memory(R, data_of(A))

    def test_no_aliasing_0(self):
        # B is a shared variable, A is updated with B's contents
        # we need A to be copied to avoid aliasing
        A = self.shared(np.zeros((2, 2)) + 0.5)
        B = self.shared(np.zeros((2, 2)) - 0.5)
        f = pfunc([], [], updates=[(A, B)])
        f()
        assert not np.may_share_memory(data_of(A), data_of(B))

    def test_no_aliasing_1(self):
        # B is a shared variable, A is updated with B's contents
        # since B is being updated as well, we don't need to copy anything
        # to avoid aliasing shared variables.
        A = self.shared(np.zeros((2, 2)) + 0.5)
        B = self.shared(np.zeros((2, 2)) - 0.5)
        C = dmatrix()
        f = pfunc([C], [], updates=[(A, B), (B, C)])
        z = np.zeros((2, 2))
        f(z)
        assert not np.may_share_memory(data_of(A), data_of(B))
        # Aesara tries to maintain its own memory space.
        assert not np.may_share_memory(z, data_of(B))
        assert np.all(data_of(B) == z)

    def test_no_aliasing_2(self):
        # B and A take one another's values
        # no copying is necessary since each one is updated.
        orig_a = np.zeros((2, 2)) + 0.5
        orig_b = np.zeros((2, 2)) - 0.5
        A = self.shared(orig_a)
        B = self.shared(orig_b)

        data_of_a = data_of(A)
        data_of_b = data_of(B)

        f = pfunc([], [], updates=[(A, B), (B, A)])
        f()
        # correctness
        assert np.all(data_of(A) == -0.5)
        assert np.all(data_of(B) == +0.5)

        # shared vars may not be aliased
        assert not np.may_share_memory(data_of(A), data_of(B))

        # aesara should have been smart enough to not make copies
        assert np.may_share_memory(data_of(A), data_of_b)
        assert np.may_share_memory(data_of(B), data_of_a)

    def test_no_aliasing_2b(self):
        # B and A take one another's values
        # no copying is necessary since each one is updated.
        # The twist one `test_no_aliasing_2` is that each shared var is updated
        # with a view of the other one.

        orig_a = np.zeros((2, 2)) + 0.5
        orig_b = np.zeros((2, 2)) - 0.5
        A = self.shared(orig_a)
        B = self.shared(orig_b)

        data_of_a = data_of(A)
        data_of_b = data_of(B)

        f = pfunc([], [], updates=[(A, B[:, ::-1]), (B, A.T)])
        # aesara.printing.debugprint(f)
        f()
        # correctness (doesn't actually test the view...)
        assert np.all(data_of(A) == -0.5)
        assert np.all(data_of(B) == +0.5)

        # shared vars may not be aliased
        assert not np.may_share_memory(data_of(A), data_of(B))

        # aesara should have been smart enough to not make copies
        if config.mode not in ["DebugMode", "DEBUG_MODE", "FAST_COMPILE"]:
            # We don't ask DebugMode and FAST_COMPILE not to make copy.
            # We have the right to do so.
            assert np.all(data_of(A) < 5)
            data_of_b += 10
            assert np.all(data_of(A) > 5)
            data_of_b -= 10

            assert np.all(data_of(B) < 5)
            data_of_a += 10
            assert np.all(data_of(B) > 5)
            data_of_a -= 10

            # N.B. may_share_memory is what we mean, but does it work?
            assert np.may_share_memory(data_of(A), data_of_b)
            assert np.may_share_memory(data_of(B), data_of_a)

            # N.B. This pattern could form a memory leak - each shared
            # variable always points to a view, and that view gets
            # further and further from the (e.g. data_of_a) with each
            # call.  The memory leak is in the increasing number of view
            # objects forming a chain to the underlying data.


class TestRebuildStrict:
    def test_rebuild_strict(self):
        # Test fix for error reported at
        # https://groups.google.com/d/topic/theano-users/BRK0UEB72XA/discussion
        w = imatrix()
        x, y = ivectors("x", "y")
        z = x * y
        f = function([w, y], z, givens=[(x, w)], rebuild_strict=False)
        z_val = f(np.ones((3, 5), dtype="int32"), np.arange(5, dtype="int32"))
        assert z_val.ndim == 2
        assert np.all(z_val == np.ones((3, 5)) * np.arange(5))


def test_rebuild_collect_shared():

    x, y = ivectors("x", "y")
    z = x * y

    with pytest.raises(TypeError):
        rebuild_collect_shared([z], replace={1: 2})
