fix the deprecated warning

Author: Richard Chen

aqua/eoh.ipynb

@@ -10,29 +10,38 @@
     "\n",
     "Further information may be found for the algorithms in the online [Aqua documentation](https://qiskit.org/documentation/aqua/algorithms.html).\n",
     "\n",
-    "For this particular demonstration, we illustrate the `EOH` algorithm. First, two `Operator` instances we created are randomly generated Hamiltonians."
+    "For this particular demonstration, we illustrate the `EOH` algorithm. First, two `WeightedPauliOperator` instances we created are randomly generated Hamiltonians."
    ]
   },
   {
    "cell_type": "code",
    "execution_count": 1,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "Converting time from a MatrixOperator to a Pauli-type Operator grows exponentially. If you are converting a system with large number of qubits, it will take time. You can turn on DEBUG logging to check the progress.\n",
+      "Converting time from a MatrixOperator to a Pauli-type Operator grows exponentially. If you are converting a system with large number of qubits, it will take time. You can turn on DEBUG logging to check the progress.\n"
+     ]
+    }
+   ],
    "source": [
     "import numpy as np\n",
     "from qiskit import BasicAer\n",
     "from qiskit.transpiler import PassManager\n",
     "from qiskit.aqua import run_algorithm, QuantumInstance\n",
-    "from qiskit.aqua.operator import Operator\n",
+    "from qiskit.aqua.operators import MatrixOperator, op_converter\n",
     "from qiskit.aqua.algorithms import EOH\n",
     "from qiskit.aqua.components.initial_states import Custom\n",
     "from qiskit.aqua.input import EnergyInput\n",
     "\n",
     "num_qubits = 2\n",
     "temp = np.random.random((2 ** num_qubits, 2 ** num_qubits))\n",
-    "qubit_op = Operator(matrix=temp + temp.T)\n",
+    "qubit_op = op_converter.to_weighted_pauli_operator(MatrixOperator(matrix=temp + temp.T))\n",
     "temp = np.random.random((2 ** num_qubits, 2 ** num_qubits))\n",
-    "evo_op = Operator(matrix=temp + temp.T)"
+    "evo_op = op_converter.to_weighted_pauli_operator(MatrixOperator(matrix=temp + temp.T))"
    ]
   },
   {
@@ -51,7 +60,7 @@
     "evo_time = 1\n",
     "num_time_slices = 1\n",
     "state_in = Custom(qubit_op.num_qubits, state='uniform')\n",
-    "eoh = EOH(qubit_op, state_in, evo_op, 'paulis', evo_time, num_time_slices)"
+    "eoh = EOH(qubit_op, state_in, evo_op, evo_time=evo_time, num_time_slices=num_time_slices)"
    ]
   },
   {
@@ -71,13 +80,13 @@
      "output_type": "stream",
      "text": [
       "The result is\n",
-      "{'avg': (3.469125838650009-1.002992831056778e-16j), 'std_dev': 0.0}\n"
+      "{'avg': (3.024786762103841-1.1976592430219064e-16j), 'std_dev': 0.0}\n"
      ]
     }
    ],
    "source": [
     "backend = BasicAer.get_backend('statevector_simulator')\n",
-    "quantum_instance = QuantumInstance(backend, pass_manager=PassManager())\n",
+    "quantum_instance = QuantumInstance(backend)\n",
     "\n",
     "ret = eoh.run(quantum_instance)\n",
     "print('The result is\\n{}'.format(ret))"
@@ -92,7 +101,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -126,15 +135,15 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
       "The result is\n",
-      "{'avg': (3.469125838650008-3.2364937588818136e-16j), 'std_dev': 0.0}\n"
+      "{'avg': (3.024786762103841-1.1976592430219064e-16j), 'std_dev': 0.0}\n"
      ]
     }
    ],
@@ -153,9 +162,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Quantum (Dev)",
    "language": "python",
-   "name": "python3"
+   "name": "quantum-dev"
   },
   "language_info": {
    "codemirror_mode": {
@@ -167,7 +176,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.1"
+   "version": "3.7.3"
   }
  },
  "nbformat": 4,