fixing errors

    - name: PyTest

      if: ${{ (success() || failure()) && (steps.install.outcome == 'failure' || steps.install.outcome == 'success') }}

      shell: bash -l {0}

      run: pytest -v -m jax deepchem

      run: pytest -v -m 'jax and not slow' deepchem

    - name: PyTest

      if: ${{ (success() || failure()) && (steps.install.outcome == 'failure' || steps.install.outcome == 'success') }}

      shell: bash -l {0}

      run: pytest -v -m "not slow and not jax and not torch" --cov=deepchem --cov-report=xml deepchem

      run: pytest -v -m "not slow and not jax and not torch and not tensorflow" --cov=deepchem --cov-report=xml deepchem

    - name: Upload coverage to Codecov

      if: ${{ (success() || failure()) && (steps.install.outcome == 'failure' || steps.install.outcome == 'success') }}

      uses: codecov/codecov-action@v1

    strategy:

      fail-fast: false

      matrix:

        python-version: [3.7]

        python-version: [3.7, 3.8]

    steps:

    - uses: actions/checkout@v2

    - name: Cache pip modules for Linux

      fail-fast: false

      matrix:

        os: [ubuntu-latest, windows-latest]

        python-version: [3.7]

        python-version: [3.7, 3.8]

        include:

          - os: ubuntu-latest

            python-version: 3.6

    - name: PyTest

      if: ${{ (success() || failure()) && (steps.install.outcome == 'failure' || steps.install.outcome == 'success') }}

      shell: bash -l {0}

      run: pytest -v -m tensorflow deepchem

      run: pytest -v -m 'tensorflow and not slow' deepchem

    - name: PyTest

      if: ${{ (success() || failure()) && (steps.install.outcome == 'failure' || steps.install.outcome == 'success') }}

      shell: bash -l {0}

      run: pytest -v -m torch deepchem

      run: pytest -v -m 'torch and not slow' deepchem

class TestCallbacks(unittest.TestCase):

  @pytest.mark.tensorflow

  @pytest.mark.torch

  def test_validation(self):

    """Test ValidationCallback."""

    tasks, datasets, transformers = dc.molnet.load_clintox()