# pyMC v 5.0.1 fails test because of lazylinker

**URL:** <https://discourse.pymc.io/t/pymc-v-5-0-1-fails-test-because-of-lazylinker/11114>\
**Category:** v5\
**Tags:** bug\
**Created:** [January 4, 2023, 4:35pm UTC](https://discourse.pymc.io/t/pymc-v-5-0-1-fails-test-because-of-lazylinker/11114 "2023-01-04T16:35:50Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![shakasaki](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/shakasaki/32/5975_2.png) [@shakasaki](https://discourse.pymc.io/u/shakasaki)\
**Post date:** [January 4, 2023, 4:35pm UTC](https://discourse.pymc.io/t/pymc-v-5-0-1-fails-test-because-of-lazylinker/11114/1 "2023-01-04T16:35:50Z")

</div>

Hello, I just upgraded to pyMC 5.0.1 and looking forward to start using it, but my old tests (that worked with v3 and v4) are failing and I can’t run any inference. Here is the test function i’m running:

```auto
def test_pymc_xarray():
    '''pyMC uses xarrays and each parameter can have coordinates and dimensions.
    This snippet is meant to explore the xarray structure used in pyMC with a simple example.
    Two approaches are used to create the xarray obsjects and these are compared in terms of time and performance'''

    # import needed packages
    import pymc as pm
    import numpy as np
    import arviz as az
    plot = True # whether to plot the resulting traces

    # set dimensions and create random state for reproducibility
    dims = 50
    rng = np.random.default_rng(5082022)

    # create arbitrary data
    dip_data = rng.standard_normal(dims)
    azimuth_data = rng.standard_normal(dims)

    # run the inference using dimensions and coordinates
    dimension_names = ['Dim ' + str(d) for d in range(dims)]
    with pm.Model(coords={"dip": dimension_names,
                          "azimuth": dimension_names}) as model:
        # initialize parameter vectors
        dips = pm.Normal("dip vector", mu=0, sigma=1, dims='dip')
        azimuths = pm.Normal("azimuth vector", mu=0, sigma=1, dims='azimuth')
        # observed data
        observed_dip = pm.Normal(
            'dip angle',
            mu=0,
            observed=dip_data,
            dims='dip')
        observed_azimuth = pm.Normal(
            'azimuth angle',
            mu=np.zeros(dims),
            observed=azimuth_data,
            dims='azimuth')
        compute_trace_dims = pm.sample(1000, tune=1000, cores=1, random_seed=5082022)

    # run the inference using shape to define dimensions
    with pm.Model() as model2:
        # parameters
        dips2 = pm.Normal('dips', mu=0, sigma=3.0, shape=dims)
        azimuths2 = pm.Normal('azimuths', mu=0, sigma=3.0, shape=dims)
        # observed data
        observed_dip2 = pm.Normal(
            'dip angle',
            mu=0,
            observed=dip_data
        )
        observed_azimuth2 = pm.Normal(
            'azimuth angle',
            mu=0,
            observed=azimuth_data
        )
        compute_trace_shape = pm.sample(1000,
                                        tune=1000,
                                        cores=1,
                                        random_seed=5082022)

    if plot:
        az.plot_trace(compute_trace_dims)
        az.plot_trace(compute_trace_shape)
    compute_trace_dims.sample_stats.acceptance_rate - compute_trace_shape.sample_stats.acceptance_rate

```

and here is the error I get:

```auto
tests/test_probabilistic_sampling.py:24 (test_pymc_xarray)
import errno
    import logging
    import os
    import sys
    import warnings
    from importlib import reload
    from types import ModuleType
    from typing import Optional
    
    import pytensor
    from pytensor.compile.compilelock import lock_ctx
    from pytensor.configdefaults import config
    from pytensor.link.c.cmodule import GCC_compiler
    
    
    _logger = logging.getLogger( __file__ )
    
    force_compile = False
    version = 0.212 # must match constant returned in function get_version()
    lazylinker_ext: Optional[ModuleType] = None
    
    
    def try_import():
        global lazylinker_ext
        sys.path[0:0] = [config.compiledir]
        import lazylinker_ext # noqa
    
        del sys.path[0]
    
    
    def try_reload():
        sys.path[0:0] = [config.compiledir]
        reload(lazylinker_ext)
        del sys.path[0]
    
    
    try:
        # See gh issue #728 for why these lines are here. Summary: compiledir must
        # be at the beginning of the path to avoid conflicts with any other
        # lazylinker_ext modules that might exist (this step handled in try_import
        # and try_reload). An __init__.py file must be created for the same reason.
        # Note that these lines may seem redundant (they are repeated in
        # compile_str()) but if another lazylinker_ext does exist then it will be
        # imported and compile_str won't get called at all.
        location = os.path.join(config.compiledir, "lazylinker_ext")
        if not os.path.exists(location):
            try:
                # Try to make the location
                os.mkdir(location)
            except OSError as e:
                # If we get an error, verify that the error was # 17, the
                # path already exists, and that it is a directory Note: we
                # can't check if it exists before making it, because we
                # are not holding the lock right now, so we could race
                # another process and get error 17 if we lose the race
                assert e.errno == errno.EEXIST
                assert os.path.isdir(location)
    
        init_file = os.path.join(location, " __init__.py")
        if not os.path.exists(init_file):
            try:
                with open(init_file, "w"):
                    pass
            except OSError as e:
                if os.path.exists(init_file):
                    pass # has already been created
                else:
                    e.args += (f"{location} exist? {os.path.exists(location)}",)
                    raise
    
        _need_reload = False
        if force_compile:
            raise ImportError()
        else:
            try_import()
            _need_reload = True
            actual_version = getattr(lazylinker_ext, "_version", None)
            if version != actual_version:
> raise ImportError(
                    "Version check of the existing lazylinker compiled file."
                    f" Looking for version {version}, but found {actual_version}. "
                    f"Extra debug information: force_compile={force_compile}, _need_reload={_need_reload}"
                )
E ImportError: Version check of the existing lazylinker compiled file. Looking for version 0.212, but found 0.211. Extra debug information: force_compile=False, _need_reload=True

```

I could not find a way to check or upgrade lazylinker. I looked around and similar errors seemed to have occured in earlier versions years ago, but I could not get a good solution.

Looking forward to hear back from the community. Thanks for the help and happy new year to all.

ps. I’m running Ubuntu 22.04 and python 3.10

---

<div class="post-metadata">

**Author:** ![cluhmann](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/cluhmann/32/3083_2.png) [@cluhmann](https://discourse.pymc.io/u/cluhmann)\
**Post date:** [January 4, 2023, 5:49pm UTC](https://discourse.pymc.io/t/pymc-v-5-0-1-fails-test-because-of-lazylinker/11114/2 "2023-01-04T17:49:05Z")

</div>

Is that the full traceback? If not, could you provide it?

---

<div class="post-metadata">

**Author:** ![shakasaki](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/shakasaki/32/5975_2.png) [@shakasaki](https://discourse.pymc.io/u/shakasaki)\
**Post date:** [January 5, 2023, 9:35am UTC](https://discourse.pymc.io/t/pymc-v-5-0-1-fails-test-because-of-lazylinker/11114/3 "2023-01-05T09:35:57Z")

</div>

Hi Chris, thank you for the quick response (my delay is because ubuntu login crashed for me yesterday…but is now fixed). You’re right, this is not the entire traceback. Here it is:

```auto
est_probabilistic_sampling.py::test_pymc_xarray FAILED [100%]
tests/test_probabilistic_sampling.py:24 (test_pymc_xarray)
import errno
    import logging
    import os
    import sys
    import warnings
    from importlib import reload
    from types import ModuleType
    from typing import Optional
    
    import pytensor
    from pytensor.compile.compilelock import lock_ctx
    from pytensor.configdefaults import config
    from pytensor.link.c.cmodule import GCC_compiler
    
    
    _logger = logging.getLogger( __file__ )
    
    force_compile = False
    version = 0.212 # must match constant returned in function get_version()
    lazylinker_ext: Optional[ModuleType] = None
    
    
    def try_import():
        global lazylinker_ext
        sys.path[0:0] = [config.compiledir]
        import lazylinker_ext # noqa
    
        del sys.path[0]
    
    
    def try_reload():
        sys.path[0:0] = [config.compiledir]
        reload(lazylinker_ext)
        del sys.path[0]
    
    
    try:
        # See gh issue #728 for why these lines are here. Summary: compiledir must
        # be at the beginning of the path to avoid conflicts with any other
        # lazylinker_ext modules that might exist (this step handled in try_import
        # and try_reload). An __init__.py file must be created for the same reason.
        # Note that these lines may seem redundant (they are repeated in
        # compile_str()) but if another lazylinker_ext does exist then it will be
        # imported and compile_str won't get called at all.
        location = os.path.join(config.compiledir, "lazylinker_ext")
        if not os.path.exists(location):
            try:
                # Try to make the location
                os.mkdir(location)
            except OSError as e:
                # If we get an error, verify that the error was # 17, the
                # path already exists, and that it is a directory Note: we
                # can't check if it exists before making it, because we
                # are not holding the lock right now, so we could race
                # another process and get error 17 if we lose the race
                assert e.errno == errno.EEXIST
                assert os.path.isdir(location)
    
        init_file = os.path.join(location, " __init__.py")
        if not os.path.exists(init_file):
            try:
                with open(init_file, "w"):
                    pass
            except OSError as e:
                if os.path.exists(init_file):
                    pass # has already been created
                else:
                    e.args += (f"{location} exist? {os.path.exists(location)}",)
                    raise
    
        _need_reload = False
        if force_compile:
            raise ImportError()
        else:
            try_import()
            _need_reload = True
            actual_version = getattr(lazylinker_ext, "_version", None)
            if version != actual_version:
> raise ImportError(
                    "Version check of the existing lazylinker compiled file."
                    f" Looking for version {version}, but found {actual_version}. "
                    f"Extra debug information: force_compile={force_compile}, _need_reload={_need_reload}"
                )
E ImportError: Version check of the existing lazylinker compiled file. Looking for version 0.212, but found 0.211. Extra debug information: force_compile=False, _need_reload=True

../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/c/lazylinker_c.py:79: ImportError

During handling of the above exception, another exception occurred:

    import errno
    import logging
    import os
    import sys
    import warnings
    from importlib import reload
    from types import ModuleType
    from typing import Optional
    
    import pytensor
    from pytensor.compile.compilelock import lock_ctx
    from pytensor.configdefaults import config
    from pytensor.link.c.cmodule import GCC_compiler
    
    
    _logger = logging.getLogger( __file__ )
    
    force_compile = False
    version = 0.212 # must match constant returned in function get_version()
    lazylinker_ext: Optional[ModuleType] = None
    
    
    def try_import():
        global lazylinker_ext
        sys.path[0:0] = [config.compiledir]
        import lazylinker_ext # noqa
    
        del sys.path[0]
    
    
    def try_reload():
        sys.path[0:0] = [config.compiledir]
        reload(lazylinker_ext)
        del sys.path[0]
    
    
    try:
        # See gh issue #728 for why these lines are here. Summary: compiledir must
        # be at the beginning of the path to avoid conflicts with any other
        # lazylinker_ext modules that might exist (this step handled in try_import
        # and try_reload). An __init__.py file must be created for the same reason.
        # Note that these lines may seem redundant (they are repeated in
        # compile_str()) but if another lazylinker_ext does exist then it will be
        # imported and compile_str won't get called at all.
        location = os.path.join(config.compiledir, "lazylinker_ext")
        if not os.path.exists(location):
            try:
                # Try to make the location
                os.mkdir(location)
            except OSError as e:
                # If we get an error, verify that the error was # 17, the
                # path already exists, and that it is a directory Note: we
                # can't check if it exists before making it, because we
                # are not holding the lock right now, so we could race
                # another process and get error 17 if we lose the race
                assert e.errno == errno.EEXIST
                assert os.path.isdir(location)
    
        init_file = os.path.join(location, " __init__.py")
        if not os.path.exists(init_file):
            try:
                with open(init_file, "w"):
                    pass
            except OSError as e:
                if os.path.exists(init_file):
                    pass # has already been created
                else:
                    e.args += (f"{location} exist? {os.path.exists(location)}",)
                    raise
    
        _need_reload = False
        if force_compile:
            raise ImportError()
        else:
            try_import()
            _need_reload = True
            actual_version = getattr(lazylinker_ext, "_version", None)
            if version != actual_version:
                raise ImportError(
                    "Version check of the existing lazylinker compiled file."
                    f" Looking for version {version}, but found {actual_version}. "
                    f"Extra debug information: force_compile={force_compile}, _need_reload={_need_reload}"
                )
    except ImportError:
        with lock_ctx():
            # Maybe someone else already finished compiling it while we were
            # waiting for the lock?
            try:
                if force_compile:
                    raise ImportError()
                if _need_reload:
                    # The module was successfully imported earlier: we need to
                    # reload it to check if the version was updated.
                    try_reload()
                else:
                    try_import()
                    _need_reload = True
                actual_version = getattr(lazylinker_ext, "_version", None)
                if version != actual_version:
> raise ImportError(
                        "Version check of the existing lazylinker compiled file."
                        f" Looking for version {version}, but found {actual_version}. "
                        f"Extra debug information: force_compile={force_compile}, _need_reload={_need_reload}"
                    )
E ImportError: Version check of the existing lazylinker compiled file. Looking for version 0.212, but found 0.211. Extra debug information: force_compile=False, _need_reload=True

../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/c/lazylinker_c.py:100: ImportError

During handling of the above exception, another exception occurred:

    def test_pymc_xarray():
        '''pyMC uses xarrays and each parameter can have coordinates and dimensions.
        This snippet is meant to explore the xarray structure used in pyMC with a simple example.
        Two approaches are used to create the xarray obsjects and these are compared in terms of time and performance'''
    
        # import needed packages
        import pymc as pm
        import numpy as np
        import arviz as az
        plot = True # whether to plot the resulting traces
    
        # set dimensions and create random state for reproducibility
        dims = 50
        rng = np.random.default_rng(5082022)
    
        # create arbitrary data
        dip_data = rng.standard_normal(dims)
        azimuth_data = rng.standard_normal(dims)
    
        # run the inference using dimensions and coordinates
        dimension_names = ['Dim ' + str(d) for d in range(dims)]
        with pm.Model(coords={"dip": dimension_names,
                              "azimuth": dimension_names}) as model:
            # initialize parameter vectors
            dips = pm.Normal("dip vector", mu=0, sigma=1, dims='dip')
            azimuths = pm.Normal("azimuth vector", mu=0, sigma=1, dims='azimuth')
            # observed data
            observed_dip = pm.Normal(
                'dip angle',
                mu=0,
                observed=dip_data,
                dims='dip')
            observed_azimuth = pm.Normal(
                'azimuth angle',
                mu=np.zeros(dims),
                observed=azimuth_data,
                dims='azimuth')
> compute_trace_dims = pm.sample(1000, tune=1000, cores=1, random_seed=5082022)

test_probabilistic_sampling.py:62: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/sampling/mcmc.py:447: in sample
    step = assign_step_methods(model, step, methods=pm.STEP_METHODS, step_kwargs=kwargs)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/sampling/mcmc.py:189: in assign_step_methods
    return instantiate_steppers(model, steps, selected_steps, step_kwargs)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/sampling/mcmc.py:107: in instantiate_steppers
    step = step_class(vars=vars, model=model, **args)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/step_methods/hmc/nuts.py:182: in __init__
    super(). __init__ (vars, **kwargs)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/step_methods/hmc/base_hmc.py:109: in __init__
    super(). __init__ (vars, blocked=blocked, model=self._model, dtype=dtype, **pytensor_kwargs)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/step_methods/arraystep.py:263: in __init__
    func = model.logp_dlogp_function(vars, dtype=dtype, **pytensor_kwargs)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/model.py:642: in logp_dlogp_function
    ip = self.initial_point(0)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/model.py:1126: in initial_point
    fn = make_initial_point_fn(model=self, return_transformed=True)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/initial_point.py:152: in make_initial_point_fn
    func = compile_pymc(inputs=[], outputs=initial_values, mode=pytensor.compile.mode.FAST_COMPILE)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pymc/pytensorf.py:1121: in compile_pymc
    pytensor_function = pytensor.function(
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/compile/function/ __init__.py:315: in function
    fn = pfunc(
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/compile/function/pfunc.py:367: in pfunc
    return orig_function(
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/compile/function/types.py:1766: in orig_function
    fn = m.create(defaults)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/compile/function/types.py:1659: in create
    _fn, _i, _o = self.linker.make_thunk(
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/basic.py:254: in make_thunk
    return self.make_all(
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/vm.py:1300: in make_all
    vm = self.make_vm(
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/vm.py:1021: in make_vm
    from pytensor.link.c.cvm import CVM
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/c/cvm.py:13: in <module>
    from pytensor.link.c.lazylinker_c import CLazyLinker
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/c/lazylinker_c.py:143: in <module>
    GCC_compiler.compile_str(dirname, code, location=loc, preargs=args)
../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/c/cmodule.py:2653: in compile_str
    return dlimport(lib_filename)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

fullpath = '/home/alexis/.pytensor/compiledir_Linux-5.15--generic-x86_64-with-glibc2.35-x86_64-3.10.8-64/lazylinker_ext/lazylinker_ext.so'
suffix = '.so'

    def dlimport(fullpath, suffix=None):
        """
        Dynamically load a .so, .pyd, .dll, or .py file.
    
        Parameters
        ----------
        fullpath : str
            A fully-qualified path do a compiled python module.
        suffix : str
            A suffix to strip from the end of fullpath to get the
            import name.
    
        Returns
        -------
        object
            The dynamically loaded module (from __import__ ).
    
        """
        if not os.path.isabs(fullpath):
            raise ValueError("`fullpath` must be an absolute path", fullpath)
        if suffix is None:
            suffix = ""
    
            dist_suffix = _get_ext_suffix()
            if dist_suffix is not None and dist_suffix != "":
                if fullpath.endswith(dist_suffix):
                    suffix = dist_suffix
    
            if suffix == "":
                if fullpath.endswith(".so"):
                    suffix = ".so"
                elif fullpath.endswith(".pyd"):
                    suffix = ".pyd"
                elif fullpath.endswith(".dll"):
                    suffix = ".dll"
                elif fullpath.endswith(".py"):
                    suffix = ".py"
    
        rval = None
        if fullpath.endswith(suffix):
            module_name = ".".join(fullpath.split(os.path.sep)[-2:])[: -len(suffix)]
        else:
            raise ValueError("path has wrong suffix", (fullpath, suffix))
        workdir = fullpath[: -len(module_name) - 1 - len(suffix)]
    
        _logger.debug(f"WORKDIR {workdir}")
        _logger.debug(f"module_name {module_name}")
    
        sys.path[0:0] = [workdir] # insert workdir at beginning (temporarily)
        # Explicitly add gcc dll directory on Python 3.8+ on Windows
        if (sys.platform == "win32") & (hasattr(os, "add_dll_directory")):
            gcc_path = shutil.which("gcc")
            if gcc_path is not None:
                os.add_dll_directory(os.path.dirname(gcc_path))
        global import_time
        try:
            importlib.invalidate_caches()
            t0 = time.perf_counter()
            with warnings.catch_warnings():
                warnings.filterwarnings("ignore", message="numpy.ndarray size changed")
                rval = __import__ (module_name, {}, {}, [module_name])
            t1 = time.perf_counter()
            import_time += t1 - t0
            if not rval:
                raise Exception(" __import__ failed", fullpath)
        finally:
            del sys.path[0]
    
> assert fullpath.startswith(rval. __file__ )
E AssertionError

../../../miniconda3/envs/bedretto/lib/python3.10/site-packages/pytensor/link/c/cmodule.py:340: AssertionError

======================== 1 failed, 8 warnings in 4.09s =========================

Process finished with exit code 1

```

---

<div class="post-metadata">

**Author:** ![cluhmann](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/cluhmann/32/3083_2.png) [@cluhmann](https://discourse.pymc.io/u/cluhmann)\
**Post date:** [January 5, 2023, 5:37pm UTC](https://discourse.pymc.io/t/pymc-v-5-0-1-fails-test-because-of-lazylinker/11114/4 "2023-01-05T17:37:50Z")

</div>

Did you install version 5 into a fresh environment? There is some seemingly realted discussion [here](https://github.com/bambinos/bambi/issues/160) which suggests it might be an installation issue. But if you installed 5 in a fresh environment (using the [recommended installation procedure](https://www.pymc.io/projects/docs/en/latest/installation.html)), I might suggest [opening an issue](https://github.com/pymc-devs/pymc/issues).

---

<div class="post-metadata">

**Author:** ![shakasaki](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.pymc.io/shakasaki/32/5975_2.png) [@shakasaki](https://discourse.pymc.io/u/shakasaki)\
**Post date:** [January 6, 2023, 2:36pm UTC](https://discourse.pymc.io/t/pymc-v-5-0-1-fails-test-because-of-lazylinker/11114/5 "2023-01-06T14:36:57Z")

</div>

You’re right, it is a package conflict of some sort. Having a fresh install works just fine. Thanks for your help!