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breeze.linalg.MatrixSingularException: 	at breeze.linalg.operators.DenseMatrixMultiplyStuff$implOpSolveMatrixBy_DMD_DMD_eq_DMD$.LUSolve(DenseMatrixOps.scala:151)	at breeze.linalg.operators.DenseMatrixMultiplyStuff$implOpSolveMatrixBy_DMD_DMD_eq_DMD$.apply(DenseMatrixOps.scala:127)	at breeze.linalg.operators.DenseMatrixMultiplyStuff$implOpSolveMatrixBy_DMD_DMD_eq_DMD$.apply(DenseMatrixOps.scala:115)	at breeze.linalg.ImmutableNumericOps$class.$bslash(NumericOps.scala:144)	at breeze.linalg.DenseMatrix.$bslash(DenseMatrix.scala:53)	at breeze.linalg.operators.DenseMatrixMultiplyStuff$implOpSolveMatrixBy_DMD_DVD_eq_DVD$.apply(DenseMatrixOps.scala:221)	at breeze.linalg.operators.DenseMatrixMultiplyStuff$implOpSolveMatrixBy_DMD_DVD_eq_DVD$.apply(DenseMatrixOps.scala:218)	at breeze.linalg.ImmutableNumericOps$class.$bslash(NumericOps.scala:144)	at breeze.linalg.DenseMatrix.$bslash(DenseMatrix.scala:53)