How to fix “KeyError: ‘acc‘“

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之所以会报错，是因为keras库老版本中的参数不是accuracy，而是acc，将参数accuracy替换为acc，

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please try

# plot accuracy evolution vs epochs
		fig = plt.figure( )
		ax = fig.add_subplot( 111 )
		ax.plot( hist.history[ 'accuracy' ], linewidth = 3. )
		ax.plot( hist.history[ 'val_accuracy' ], linewidth = 3. )
		plt.title( ' Accuracy' )
		plt.ylabel( 'Accuracy' )
		plt.xlabel( 'Epoch' )
		plt.legend( [ 'Train', 'Validation' ], loc = 'upper left' )
		plt.savefig( join( self.resultDir, self.modelFileName + '_accuracy_function.png' ) )
		plt.show( )

instead of

# plot accuracy evolution vs epochs
		fig = plt.figure( )
		ax = fig.add_subplot( 111 )
		ax.plot( hist.history[ 'acc' ], linewidth = 3. )
		ax.plot( hist.history[ 'val_acc' ], linewidth = 3. )
		plt.title( ' Accuracy' )
		plt.ylabel( 'Accuracy' )
		plt.xlabel( 'Epoch' )
		plt.legend( [ 'Train', 'Validation' ], loc = 'upper left' )
		plt.savefig( join( self.resultDir, self.modelFileName + '_accuracy_function.png' ) )
		plt.show( )