# Drawing the circuit in pennylane

**URL:** <https://discuss.pennylane.ai/t/drawing-the-circuit-in-pennylane/3305>\
**Category:** PennyLane Help\
**Created:** [August 12, 2023, 5:51am UTC](https://discuss.pennylane.ai/t/drawing-the-circuit-in-pennylane/3305 "2023-08-12T05:51:51Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Manu\_Chaudhary](https://yyz2.discourse-cdn.com/flex012/user_avatar/discuss.pennylane.ai/manu_chaudhary/32/1868_2.png) [@Manu\_Chaudhary](https://discuss.pennylane.ai/u/Manu_Chaudhary)\
**Post date:** [August 12, 2023, 5:51am UTC](https://discuss.pennylane.ai/t/drawing-the-circuit-in-pennylane/3305/1 "2023-08-12T05:51:51Z")

</div>

I am trying to draw the circuit in pennylane for the kernel code: [https://github.com/thubregtsen/qhack/blob/master/paper/noiseless\_MNIST.py](https://github.com/thubregtsen/qhack/blob/master/paper/noiseless_MNIST.py)  
I am able to draw the circuit but not able to understand much

 ![uob8y](https://canada1.discourse-cdn.com/flex012/uploads/pennylane/original/2X/f/f0a66608f06dd58e3a9805cb19533d1eea9e8d06.png)  
. Please guide me how to understand this circuit? Also, is there any better way to draw the circuit?

```auto
from keras.datasets import mnist
from keras.datasets import mnist

# import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt

import pennylane as qml
from pennylane import numpy as np

## device and circuit characteristics
width = 4
depth = 8

dev = qml.device("default.qubit", wires=width)
wires = list(range(width))
print("The value of wires= ", wires)

# Our Ansatz
def layer(x1, params, wires, i0=0, inc=1):
    """Building block of the embedding Ansatz"""
    i = i0
    
    for j, wire in enumerate(wires):
       
        qml.Hadamard(wires=[wire])
        
        qml.RZ(x1[i % len(x1)], wires=[wire])
        i += inc
        qml.RY(params[0, j], wires=[wire])
        
    qml.broadcast(unitary=qml.CRZ, pattern="ring", wires=wires, parameters=params[1])

# @qml.template # type: ignore
def ansatz(x1, params, wires):   
    """The embedding Ansatz"""
    for j, layer_params in enumerate(params):
        layer(x1, layer_params, wires, i0=j * len(wires))
        
        

# init the embedding kernel
@qml.qnode(dev)
def kernel(x1, x2, params):
    ansatz(x1, params, wires)
    qml.adjoint(ansatz)(x2, params, wires) # type: ignore
    return qml.expval(qml.Projector([0]*width, wires=wires))

x1 = np.array([0.5, 0.25])

x2 = np.array([0.28571429, 0.53571429])

params = np.array([[[5.27502056, 1.47427201, 4.93076496, 2.46091687],
  [5.31970254, 3.72079515, 5.23318151, 3.6141986]],

 [[4.56873422, 4.71736634, 3.74526732, 4.03018843],
  [2.50768043, 6.05648213, 0.15691596, 4.6339621]],

 [[3.13801229, 4.06608748, 3.67299568, 0.56942335],
  [3.7249661, 0.21089213, 1.81957038, 5.11239481]],

 [[0.23371406, 0.38418188, 1.57283641, 2.1281051],
  [4.82044232, 2.29357766, 2.28309303, 1.36251918]],

 [[3.81316379, 1.72378489, 5.33909833, 1.99670676],
  [0.95241059, 4.91302177, 5.11174524, 0.50581628]],

 [[2.93171839, 4.72425322, 4.13123708, 2.1082139],
  [3.44454441, 3.57751799, 4.82533803, 3.01520779]],

 [[4.82192352, 4.9103957, 5.62978572, 2.72576366],
  [2.52244612, 2.06081289, 6.28092847, 4.55329168]],

 [[5.67932649, 1.43286835, 6.13243934, 3.72696941],
  [5.50192702, 1.69022441, 3.61985605, 4.94172026]]])

# print(qml.draw(kernel(x1, x2, params), charset="unicode")) # type: ignore

fig, ax = qml.draw_mpl(kernel)(x1, x2, params)

# print(qml.draw(circuit_qnode)(X_train_dist_zero_not_zero[0], params))

plt.show()

```

---

<div class="post-metadata">

**Author:** ![kevinkawchak](https://yyz2.discourse-cdn.com/flex012/user_avatar/discuss.pennylane.ai/kevinkawchak/32/1801_2.png) [@kevinkawchak](https://discuss.pennylane.ai/u/kevinkawchak)\
**Post date:** [August 12, 2023, 6:32am UTC](https://discuss.pennylane.ai/t/drawing-the-circuit-in-pennylane/3305/2 "2023-08-12T06:32:20Z")

</div>

Hello @Manu_Chaudhary,

The qml.broadcast(unitary=qml.CRZ, pattern=“ring”, wires=wires, parameters=params[1]) appears to be crowding the H, RZ, RY.

Function draw\_mpl contains useful information. [qml.draw\_mpl — PennyLane 0.31.1 documentation](https://docs.pennylane.ai/en/stable/code/api/pennylane.draw_mpl.html)

You may have to adjust the scaling of fig, ax by setting fig.set\_size\_inches(#, #) and adjusting the #s, code by OpenAI, Best regards.

---

<div class="post-metadata">

**Author:** ![Manu\_Chaudhary](https://yyz2.discourse-cdn.com/flex012/user_avatar/discuss.pennylane.ai/manu_chaudhary/32/1868_2.png) [@Manu\_Chaudhary](https://discuss.pennylane.ai/u/Manu_Chaudhary)\
**Post date:** [August 12, 2023, 4:15pm UTC](https://discuss.pennylane.ai/t/drawing-the-circuit-in-pennylane/3305/3 "2023-08-12T16:15:12Z")

</div>

> [@Manu\_Chaudhary](#):
>
> `fig, ax = qml.draw_mpl(kernel)(x1, x2, params)`

Thank you the response. I am new to pennylane. Can you make changes in the above line so that the circuit is displayed correctly.

---

<div class="post-metadata">

**Author:** ![kevinkawchak](https://yyz2.discourse-cdn.com/flex012/user_avatar/discuss.pennylane.ai/kevinkawchak/32/1801_2.png) [@kevinkawchak](https://discuss.pennylane.ai/u/kevinkawchak)\
**Post date:** [August 12, 2023, 5:14pm UTC](https://discuss.pennylane.ai/t/drawing-the-circuit-in-pennylane/3305/4 "2023-08-12T17:14:49Z")

</div>

Hello @Manu_Chaudhary,

I was able to get a circuit print out running your specific code in a colab notebook; no fig.set needed. Be sure to check the depth of the circuit to see if this is what you want as the pattern changes. Perhaps run in a different IDE, or other settings.

 ![download](https://canada1.discourse-cdn.com/flex012/uploads/pennylane/original/2X/d/dacfbbda7d6510879a9badbed338e296c8683148.png)

---

<div class="post-metadata">

**Author:** ![Manu\_Chaudhary](https://yyz2.discourse-cdn.com/flex012/user_avatar/discuss.pennylane.ai/manu_chaudhary/32/1868_2.png) [@Manu\_Chaudhary](https://discuss.pennylane.ai/u/Manu_Chaudhary)\
**Post date:** [August 12, 2023, 6:01pm UTC](https://discuss.pennylane.ai/t/drawing-the-circuit-in-pennylane/3305/5 "2023-08-12T18:01:10Z")

</div>

Thank you @kevinkawchak for this great great help. The circuit displays correctly when I am running the code on the notebook.