alphafold: SymbolAlreadyExposedError

Running Alphafold on Colab with all default settings including the default sequence_1

Step 4 “Search against genetic database” results in the following fatal error:

SymbolAlreadyExposedError                Traceback (most recent call last)
[<ipython-input-14-f1fdee26350e>](https://localhost:8080/#) in <cell line: 27>()
    25 import py3Dmol
    26 
---> 27 from alphafold.model import model
    28 from alphafold.model import config
    29 from alphafold.model import data

22 frames
[/opt/conda/lib/python3.10/site-packages/alphafold/model/model.py](https://localhost:8080/#) in <module>
    18 from absl import logging
    19 from alphafold.common import confidence
---> 20 from alphafold.model import features
    21 from alphafold.model import modules
    22 from alphafold.model import modules_multimer

[/opt/conda/lib/python3.10/site-packages/alphafold/model/features.py](https://localhost:8080/#) in <module>
    17 from typing import List, Mapping, Tuple
    18 
---> 19 from alphafold.model.tf import input_pipeline
    20 from alphafold.model.tf import proteins_dataset
    21 

[/opt/conda/lib/python3.10/site-packages/alphafold/model/tf/input_pipeline.py](https://localhost:8080/#) in <module>
    15 """Feature pre-processing input pipeline for AlphaFold."""
    16 
---> 17 from alphafold.model.tf import data_transforms
    18 from alphafold.model.tf import shape_placeholders
    19 import tensorflow.compat.v1 as tf

[/opt/conda/lib/python3.10/site-packages/alphafold/model/tf/data_transforms.py](https://localhost:8080/#) in <module>
    16 
    17 from alphafold.common import residue_constants
---> 18 from alphafold.model.tf import shape_helpers
    19 from alphafold.model.tf import shape_placeholders
    20 from alphafold.model.tf import utils

[/opt/conda/lib/python3.10/site-packages/alphafold/model/tf/shape_helpers.py](https://localhost:8080/#) in <module>
    14 
    15 """Utilities for dealing with shapes of TensorFlow tensors."""
---> 16 import tensorflow.compat.v1 as tf
    17 
    18 

[/opt/conda/lib/python3.10/site-packages/tensorflow/__init__.py](https://localhost:8080/#) in <module>
   476   # See b/196254385 for more details.
   477   try:
--> 478     importlib.import_module("keras.optimizers")
   479   except (ImportError, AttributeError):
   480     pass

[/usr/lib/python3.10/importlib/__init__.py](https://localhost:8080/#) in import_module(name, package)
   124                 break
   125             level += 1
--> 126     return _bootstrap._gcd_import(name[level:], package, level)
   127 
   128 

[/usr/local/lib/python3.10/dist-packages/keras/__init__.py](https://localhost:8080/#) in <module>
     1 """AUTOGENERATED. DO NOT EDIT."""
     2 
----> 3 from keras import __internal__
     4 from keras import activations
     5 from keras import applications

[/usr/local/lib/python3.10/dist-packages/keras/__internal__/__init__.py](https://localhost:8080/#) in <module>
     1 """AUTOGENERATED. DO NOT EDIT."""
     2 
----> 3 from keras.__internal__ import backend
     4 from keras.__internal__ import layers
     5 from keras.__internal__ import losses

[/usr/local/lib/python3.10/dist-packages/keras/__internal__/backend/__init__.py](https://localhost:8080/#) in <module>
     1 """AUTOGENERATED. DO NOT EDIT."""
     2 
----> 3 from keras.src.backend import _initialize_variables as initialize_variables
     4 from keras.src.backend import track_variable

[/usr/local/lib/python3.10/dist-packages/keras/src/__init__.py](https://localhost:8080/#) in <module>
    19 """
    20 
---> 21 from keras.src import applications
    22 from keras.src import distribute
    23 from keras.src import models

[/usr/local/lib/python3.10/dist-packages/keras/src/applications/__init__.py](https://localhost:8080/#) in <module>
    16 
    17 
---> 18 from keras.src.applications.convnext import ConvNeXtBase
    19 from keras.src.applications.convnext import ConvNeXtLarge
    20 from keras.src.applications.convnext import ConvNeXtSmall

[/usr/local/lib/python3.10/dist-packages/keras/src/applications/convnext.py](https://localhost:8080/#) in <module>
    26 import tensorflow.compat.v2 as tf
    27 
---> 28 from keras.src import backend
    29 from keras.src import initializers
    30 from keras.src import layers

[/usr/local/lib/python3.10/dist-packages/keras/src/backend.py](https://localhost:8080/#) in <module>
    33 from keras.src.distribute import distribute_coordinator_utils as dc
    34 from keras.src.dtensor import dtensor_api as dtensor
---> 35 from keras.src.engine import keras_tensor
    36 from keras.src.utils import control_flow_util
    37 from keras.src.utils import object_identity

[/usr/local/lib/python3.10/dist-packages/keras/src/engine/keras_tensor.py](https://localhost:8080/#) in <module>
    17 import tensorflow.compat.v2 as tf
    18 
---> 19 from keras.src.utils import object_identity
    20 
    21 # isort: off

[/usr/local/lib/python3.10/dist-packages/keras/src/utils/__init__.py](https://localhost:8080/#) in <module>
    18 
    19 # Serialization related
---> 20 from keras.src.saving.serialization_lib import deserialize_keras_object
    21 from keras.src.saving.serialization_lib import serialize_keras_object
    22 from keras.src.saving.object_registration import CustomObjectScope

[/usr/local/lib/python3.10/dist-packages/keras/src/saving/serialization_lib.py](https://localhost:8080/#) in <module>
    26 from keras.src.saving import object_registration
    27 from keras.src.saving.legacy import serialization as legacy_serialization
---> 28 from keras.src.saving.legacy.saved_model.utils import in_tf_saved_model_scope
    29 from keras.src.utils import generic_utils
    30 

[/usr/local/lib/python3.10/dist-packages/keras/src/saving/legacy/saved_model/utils.py](https://localhost:8080/#) in <module>
    28 from keras.src.utils import tf_contextlib
    29 from keras.src.utils.generic_utils import LazyLoader
---> 30 from keras.src.utils.layer_utils import CallFunctionSpec
    31 
    32 training_lib = LazyLoader("training_lib", globals(), "keras.src.engine.training")

[/usr/local/lib/python3.10/dist-packages/keras/src/utils/layer_utils.py](https://localhost:8080/#) in <module>
    24 import tensorflow.compat.v2 as tf
    25 
---> 26 from keras.src import initializers
    27 from keras.src.utils import io_utils
    28 

[/usr/local/lib/python3.10/dist-packages/keras/src/initializers/__init__.py](https://localhost:8080/#) in <module>
    21 
    22 from keras.src.initializers import initializers
---> 23 from keras.src.initializers import initializers_v1
    24 from keras.src.saving import serialization_lib
    25 from keras.src.saving.legacy import serialization as legacy_serialization

[/usr/local/lib/python3.10/dist-packages/keras/src/initializers/initializers_v1.py](https://localhost:8080/#) in <module>
    30 _v1_glorot_normal_initializer = tf.compat.v1.glorot_normal_initializer
    31 
---> 32 keras_export(v1=["keras.initializers.Zeros", "keras.initializers.zeros"])(
    33     _v1_zeros_initializer
    34 )

[/opt/conda/lib/python3.10/site-packages/tensorflow/python/util/tf_export.py](https://localhost:8080/#) in __call__(self, func)
   346 
   347     _, undecorated_func = tf_decorator.unwrap(func)
--> 348     self.set_attr(undecorated_func, api_names_attr, self._names)
   349     self.set_attr(undecorated_func, api_names_attr_v1, self._names_v1)
   350 

[/opt/conda/lib/python3.10/site-packages/tensorflow/python/util/tf_export.py](https://localhost:8080/#) in set_attr(self, func, api_names_attr, names)
   362     if api_names_attr in func.__dict__:
   363       if not self._allow_multiple_exports:
--> 364         raise SymbolAlreadyExposedError(
   365             'Symbol %s is already exposed as %s.' %
   366             (func.__name__, getattr(func, api_names_attr)))  # pylint: disable=protected-access

SymbolAlreadyExposedError: Symbol Zeros is already exposed as ().`