Source code for pytorch_lightning.utilities.finite_checks
# Copyright The Lightning AI team.## Licensed under the Apache License, Version 2.0 (the "License");# you may not use this file except in compliance with the License.# You may obtain a copy of the License at## http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an "AS IS" BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License."""Helper functions to detect NaN/Inf values."""importloggingimporttorchimporttorch.nnasnnlog=logging.getLogger(__name__)
[docs]defprint_nan_gradients(model:nn.Module)->None:"""Iterates over model parameters and prints out parameter + gradient information if NaN."""forparaminmodel.parameters():if(param.gradisnotNone)andtorch.isnan(param.grad.float()).any():log.info(f"{param}, {param.grad}")
[docs]defdetect_nan_parameters(model:nn.Module)->None:"""Iterates over model parameters and prints gradients if any parameter is not finite. Raises: ValueError: If ``NaN`` or ``inf`` values are found """forname,paraminmodel.named_parameters():ifnottorch.isfinite(param).all():print_nan_gradients(model)raiseValueError(f"Detected nan and/or inf values in `{name}`."" Check your forward pass for numerically unstable operations.")
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