执行代码：

model.fit(x_train, y_train, epochs=20, verbose=True, validation_data=(x_dev, y_dev), batch_size=10)

报错信息：

I tensorflow/compiler/mlir/mlir_graph_optimization_pass.cc:116] None of the MLIR optimization passes are enabled (registered 2)
W tensorflow/core/platform/profile_utils/cpu_utils.cc:126] Failed to get CPU frequency: 0 Hz
F tensorflow/core/grappler/costs/op_level_cost_estimator.cc:710] Check failed: 0 < gflops (0 vs. 0)type: "CPU"

解决方法：

安装的TensorFlow版本不正确。需要使用支持Mac M1芯片的版本。运行以下bash脚本下载并安装TensorFlow。

脚本如下：

#!/bin/bash
set -e
VERSION=0.1alpha3
INSTALLER_PACKAGE=tensorflow_macos-$VERSION.tar.gz
INSTALLER_PATH=https://github.com/apple/tensorflow_macos/releases/download/v$VERSION/$INSTALLER_PACKAGE
INSTALLER_SCRIPT=install_venv.sh
echo
# Check to make sure we're good to go.
if [[ $(uname) != Darwin ]] || [[ $(sw_vers -productName) != macOS ]] || [[ $(sw_vers -productVersion) != "11."* ]] ; then 
  echo "ERROR: TensorFlow with ML Compute acceleration is only available on macOS 11.0 and later." 
  exit 1
fi
# This 
echo "Installation script for pre-release tensorflow_macos $VERSION.  Please visit https://github.com/apple/tensorflow_macos "
echo "for instructions and license information."   
echo
echo "This script will download tensorflow_macos $VERSION and needed binary dependencies, then install them into a new "
echo "or existing Python 3.8 virtual environment."
# Make sure the user knows what's going on.  
read -p 'Continue [y/N]? '    
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
exit 1
fi
echo
echo "Downloading installer."
tmp_dir=$(mktemp -d)
pushd $tmp_dir
curl -LO $INSTALLER_PATH 
echo "Extracting installer."
tar xf $INSTALLER_PACKAGE
cd tensorflow_macos 
function graceful_error () { 
  echo 
  echo "Error running installation script with default options.  Please fix the above errors and proceed by running "
  echo 
  echo "  $PWD/$INSTALLER_SCRIPT --prompt"
  echo 
  echo
  exit 1
}
bash ./$INSTALLER_SCRIPT --prompt || graceful_error 
popd
rm -rf $tmp_dir

参考文档：https://github.com/apple/tensorflow_macos